@2

I stayed with Marisa for over an hour. Celia came in with my sister a few times to check on her. Everything was just fine, Celia had assured us after the first visit, but I wanted to stay with her nonetheless. She was asleep and resting normally. I sat beside her on the bed, occasionally stroking her hair or gently kissing her hand.

At about 10 PM, I left Marisa for the night and joined Celia and Karen in the rec room. After the panic and flurry of activity surrounding the possibility of Marisa overdosing on Valium, things had settled down. They both had poured a drink now, and invited me to have one with them.

"Don't worry, really," Celia urged both myself and my sister. "Marisa's an angel, she's really a good, good kid. She probably just got a bit of bad advice. I mean, she's never broken curfew this year, right? She's always polite, her grades are, well, I mean I wish my kids did that well at school! This incident is a one-off, trust me. I can talk to her about it if you guys aren't comfortable, I mean, I am a nurse, right?"

"No, I can talk to her about it..." I said dispassionately. "I just... I guess I have a hard time believing it, you know? She's been so good since she turned sixteen, almost too good. Now she's eighteen, adult, graduated from high school... Why would she start using drugs now?"

"Lets' not make too much of it right now, ok?" my sister said. "She's ok now. Celia figures this was just an experiment, right? I think so too. She only just started drinking. She's only been drinking with her friends once, at a party. She told me about that. She didn't like it, anyway. Julie and Jamie don't drink, they're her closest buddies. I can't see them feeding her drugs. And Trevor? Nah, not seeing it either."

I just gazed over at Karen with a sort of defeated look.

"If we treat her like an adult, ask her honest questions," she went on, "I'm sure she'll give us honest answers. We've always had good openness like that. I think we make sure she understands she's not going to lose privileges over this."

I raised an eyebrow at that.

"Look," Karen said. "She's an adult, right? We have to trust her to make adult decisions. If we treat her like a kid over this, it's only going to make her resent us. Just trust her, right? She'll do the right thing."

I just resigned the whole discussion. I changed the topic and asked Celia about work, and what was new. We chatted and actually had a pretty good time once we loosened up a bit. As annoying as I found Celia to be sometimes, she really was a nice person. And a good nieghbour. And I really couldn't thank her enough for helping us out. I really did not want to get ambulances and drug counselors and police or any of that crap involved.

We conversed and joked around until about midnight. Celia checked on Marisa one last time, and we said good night. Karen and I retired to the bedroom.

We talked and held each other, tried to decide what to do about Marisa. Eventually I came around to Karen's way of thinking. Treat her like an adult, frank discussion, no real consequences as long as this remained an isolated incident.

After we had discussed, and consoled, and comforted, we shared a deep, loving kiss.

I relayed to Karen the interactions between Marisa and myself before she had passed out, and she in turn told me about her brief visit with Celia.

"So, how are those balls doing anyway, Babe?" she asked me.

"Very sore," I replied. "It feels like they're swollen; the sides are kind of throbbing. It hurts if I sit or lean the wrong way."

My sister just laughed. "Oh my god, that's so... There's just something extra delicious about that... Mmmmm, I'd love to suck that load out of you right now."

"Oh, Love, you have no idea how bad I need that... But I'm gonna last out. This is either for Marisa or for you on Tuesday. I'm committed."

"I have to admire your conviction. I didn't think you had it in you. But I want to get off. Eat me?"

I laughed. "Well, I did promise to not hold out on you. Plus, I love eating your cunt." I winked. "Ok, lay back and spread 'em."

She did so, and I dove in between her legs. She tasted absolutely delectable. It was like my brain knew my cock and balls weren't going to be getting any satisfaction or relief, so my tongue was now my means of sexual gratification. I tasted her cream, and began gently probing her labia. She sighed in contentment and expectation.

This was incredible! Each flick of my tongue, every bit of her pussy I tasted, sent electric jolts of pleasure through my tongue and into my mouth. I sunk my tongue betwixt the meaty folds of her vulva, parting her insistently and deliberately, thrusting in and out, flicking up against her clit and urethra, swirling around her lips and down into her trench.

I began tongue-fucking my little sister furiously, driving deep into the recesses of her most sensitive flesh. My cock was fully erect and bobbing with need, and I was aware that my throbbing balls were pulsing with fresh waves of discomfort. I ignored my lower regions and concentrated on the intense pleasure I was getting from eating Karen's pussy. I had always loved licking it, but somehow the entire experience had been taken to the next level.

Karen was groaning now and twisting her hips in response to my ministrations. I wanted to make her cum. I wanted to suck up all her cream. I wanted to eat her out, in, up, down and any other way I could conceive of. This was utter bliss.

"Whoa," she gasped. "Slow down there. I wanna tease you some more." Reluctantly I released her mound from my mouth as she rose to her hands and knees and twisted. "Those balls are sore, huh? Ok, let me... soothe them," she giggled.

She crawled underneath me and locked her thighs around my head. I resumed licking and penetrating her vulva enthusiastically as, with some alarm, I felt her hands gently caressing my scrotum.

I tried to ignore the sensation and again lost myself completely in the joy of performing cunnilingus on my gorgeous little sister. Damn, her pussy tasted so good! I couldn't get enough.

She began moaning again beneath my oral attentions. Her hands encircled my throbbing testicles and I felt her begin kissing them lightly. Then she began flicking them ever-so-lightly with her tongue. It was, indeed, sort of soothing, pleasant. But my balls were so overfull that right now there could be only one method of true relief. And even then, they would probably be throbbing painfully for some hours afterward. In any case, I resolved myself to the fact that relief would not be forthcoming; I just hoped Karen was not going to be too cruel with her teases. I think she was really getting off on having me this horny and desperate for release.

She gently sucked my testicles, one at a time. Delicious agony. In their state, what would have normally been intensely intimate and pleasurable was alarming and painful. I focused on sucking on her clit. The glorious pleasure I felt in my mouth and brain were offsetting the testicular throbbing that Karen was teasing slowly higher. Maybe if I made her cum quickly I would have an easier time from her?

I attacked her clit with long, fast licks, swooping up and down on her pink pearl, using my lips to suck and kiss her inner folds as I did so. Her hips were rocking and twitching now, so I knew she was approaching orgasm. This was my goal. Bring her off. Perhaps she would be more merciful.

Underneath me, Karen was now panting and moaning with pleasure. "Wow," she remarked breathlessly, "These things even feel swollen. Bigger. Mmmmmm, yeah keep sucking my cunt. I'm gonna suck your balls..."

With increasing distress and discomfort, she did. She drew both of my agonized testicles into her mouth. They were big enough that they would barely both fit in there at the best of times, and now even the gently tension of the inside of her cheeks constricting them felt like a vice. I whimpered slightly, shifting and writhing against the insistent discomfort and redoubled my efforts on her clit, desperate to make her cum in hopes she would release me.

Karen started sucking on my balls. As lightly as she sucked, the pressure was intense. The pain insistent. I licked harder and faster. I groaned in pain, concentrating on the ecstasy my tongue was bringing me from the taste and feel of my little sister's hot snatch.

Oh, lord, please cum...I silently implored as I felt the pressure on my balls increase. Karen was moaning into my balls deeply now, her hips thrusts increasing in frequency. She was so close, I could feel it. She clenched. She drew her breath in sharply. I was in agony now. She was sucking my balls hard! I couldn't take it! Near screaming in my anguish, I plunged my tongue as far into her cunt as I could, snaking my tongue up and back, thrashing it around, trying to stroke her G-spot.

Finally she came!! Moaning, bucking and vibrating, she succumbed to orgasm, feeling glorious satisfaction and release flood her being. She increased the intensity of the vacuum around my suffering gonads. I didn't know if the increase was intentional or involuntary, but my eyes were nearly bugging out and my mind overloaded with afflicted grief.

Then suddenly, she released my balls! Relief and well-being flowed briefly back into my nuts as they were freed, and Karen lay moaning out the pleasures of her release as I drove my tongue as far as I could into her vagina. "Ok!" she gasped out. "Ok, ok ok!!! Enough!!"

I groaned in pleasure and pain mingled, my tongue still glowing and shivering with the pleasure of orally pleasing my sister, and my balls now fully returned to smarting and throbbing.

"Whew!" gasped Karen. "Hmmm, awesome... This is fun." She snickered. "As much as I like eating that load, I think I'm really liking playing with your balls when they're this jammed with cum. You?"

"Oh, shit, Karen, I, uh... Well, it's kind of good? But it's getting too much. I was sure I could last until Tuesday if I had to, but now I dunno. My balls are starting to really hurt. I don't know what they're going to feel like in the morning."

"Want me to make you cum? I will, but you won't like what that will make happen on Tuesday..." she sang with a grin.

"You are a bitchy little tease," I chuckled. "You're enjoying this way too much. I'm gonna win a bet here soon and then I'll get you back. Just you wait."

Karen laughed. "I'm always six or seven steps ahead of you. But knock yourself out. It'll be fun either way."

We kissed passionately and held each other for a time. Soon we were both asleep.

My dreams were troubled, my sleep fitful. I woke in the morning and began preparing for work. My testicles felt like they were swollen to the size of pumpkins. I swore I could see them actually physically larger than normal. My pants were uncomfortable. If I sat down the wrong way, a slug of pain would jangle through my balls up my spine. This was going to be rough. And I had to last longer than another 24 hours?? Oh, lord... Were Marisa's panties to be my only salvation?

Karen and I had quickly checked on Marisa pretty much the moment we had woken up. She was sleeping, sprawled out, breathing normally. All seemed well. We had decided to have a brief chat about last night with her before we left for work.

We showered, ate, dressed, and were both due to leave in about 20 minutes, so we decided it was time to rouse Marisa and get the talk over with. We had our strategy, so we hoped it would be quick. Neither of us wanted to lecture or scold her; she was always such a good girl. But we did want to let her know how concerned we were.

Marisa woke somewhat sluggishly. We discussed what we needed to. She was embarrassed, and ashamed. We assured her that we trusted her, and would still do so. But that what she had done was quite foolish, and potentially dangerous. She cried. It broke my heart.

We asked her who she'd gotten the Valium from. She told us it was Julie and Jamie. Their mother, it turns out, ate them like candy to reduce her stress. My mind did a quick panic since the J girls, as we had dubbed them, were due for a sleepover at our place on Wednesday night. I shot a quick glance to Karen, indicating we would talk about that separately.

As punishment, we told Marisa she was to research and learn all she could about Valium. That was it, and we would consider the matter dealt with. Tearfully, she assured us she would never do anything that foolish again.

With that, I kissed my daughter on the cheek, Karen and I both hugged her goodbye, and we set off for work.

Work was uncomfortable to say the least. My balls felt like they were on fire. Just sitting at my desk was near unbearable. The slightest amount of pressure to my sack felt like a solid kick. And every time I glanced over at my daughter's photograph on the corner of my desk, my cock leapt a little and began stiffening. By 10 AM I was leaned back all the way in my chair with my legs spread and aloft to try to keep my nuts free from any sensation, so at least they could softly pulse and throb without causing me to wince. I must have looked ridiculous so I closed the shutters and just concentrated on doing phone work. That was fine since there were a number of loose ends I needed to tie up before the weekend.

By noon I was cupping my nuts, pressing in gently and relaxing. It was like a toothache or something. Just sitting there throbbing was too distracting -- at least the mild pain of my hand resting on them assured my swollen gonads that they weren't just going to spontaneously pop. In between phone calls I was whimpering and groaning.

By 1 PM I had my pants and underwear off. I told my secretary to make sure everyone knew I was unavailable. I made phone calls from the couch in my office on my hands and knees with my legs wide so my balls could at least dangle and throb unrestricted. I had no idea how I was going to get home. The idea of underwear, pants, or sitting in a car for the ride home was almost too much.

By 2 PM I had my secretary bring in a bucket of ice. I sat at my desk naked from the waist down. As long as she didn't come in, no one would be able to see. I had her place the bucket just inside my door. She looked at me like I was crazy or something, but I was desperate. I just looked like I totally knew what I was doing, calm and relaxed, and the second the door was shut I raced over to the bucket and began icing my nuts.

At 3, I was just wrapping up the day sitting on an ice-filled towel wondering if I should call an ambulance. I was genuinely starting to consider if I might need medical attention. I couldn't even shift or rock my hips gently. Just sitting there was pain. Any movement was more pain. I couldn't concentrate on a single business call anymore. What could I do? How could I get home?

I sat there, suffering, sweating, completely at a loss as to what to do. I picked up the phone. 9... Click. I hung it up. Then picked it up again. 91... Click. What the fuck! Was I really about to call emergency? And say what? "Hi, I need an ambulance, I have a life-threatening case of blue balls??"

With my last vestige of coherency, I seized upon another idea. Almost as desperate. But what else could I do? I picked up the phone. I hesitated. But I felt I had no choice. I dialed, slowly. Number by number. Finally I finished and I heard the electronic click of the call being completed. The phone rang.

"Hello?" came the voice from the other end. I paused. "Hello?"

"Hi. Hi, Celia? Yeah. Yeah, it's me. No. No, Marisa's fine. It's not about her. No, she's just fine, we had a talk this morning. Yeah, I guess it was Julie and Jamie. They got it from their mother, she's a pill-popper or something... Yeah, no, it's all fine. They have a... Wednesday night. Yes, it's still on. As far as I know, Karen and I are still going to talk about it... Celia. Celia, hold on. That's not what... Yeah, no I called about something different. Well... It's just that... Well... Ok, ok. Well, here it is. I don't know if it's risky, but... Karen and I are playing a game. Look, it's embarrassing, ok? Look, just swear to me you won't say anything to Karen ok? I was gonna call emergency... It's my... My balls. Yeah, you heard right. No, they... I just haven't... cum in a couple of days. No, I'm serious. Seriously. I was going to call an ambulance! Or something... I've got... You really...? Ok, ok, I usually cum like at least three times a day. More sometimes. Ha, ha, well, that's between you and your boyfriend. Right. No, seriously, probably haven't gone this long since I was a teenager. Yes, two days. Well, I've got ice on them. They hurt. What? Nope, normal colour... I think so. No, I mean, I think they sort of look bigger, but... No, honestly I think it's my imagination. I... Really? But... No, really? But it's like a toothache or something! I... Celia, I really can't! Because I promised, that's why! So there's... Right... Really? Now, look, it's... No, right, right... I can't, I swore I wouldn't... All right then. Ok, Celia, now... No, really, please, please don't say anything to Karen. No, it's... Look, thank you so much for everything ok? I know it seems ridiculous, but I didn't know who else to call. And thanks again for coming over last night too. No, really, I owe you huge. And Celia... Thanks for not laughing too much, ok? Yeah, I know. I will. Ok, bye."

Whew. I felt stupid. Well, at least I hadn't had to walk through that with a 911 dispatcher or EMT. I owed Celia real big. She had come through in such a major way in the past 24 hours... Oh, my nuts hurt... Jack off, eh? That's the cure? I couldn't. Could I? I promised Karen... But there of course was always option three, right? But, but... Oh, god, I hadn't even brought a pair of Marisa's panties with me! Plus, she said she wanted to watch... My god, I was really screwed. How was I going to get home?

I waited it out until basically everyone else had left the office. Then I put my pants on, stuffing my underwear in my briefcase. Kind of amusing, I thought to myself... First time I'd ever had my briefs in my briefcase. I hobbled bow-legged out to the parkade. The drive home was less than comfortable. By the time I reached home I was basically numb in my whole groin. Holy shit, this was ridiculous.

Karen greeted me at the door with a grin and a kiss. My expression belied my suffering somewhat. She expressed concern, until I revealed the nature of my affliction. Her concern then turned to satisfied amusement.

"So, you're hurtin', huh? Balls as blue as the sea?" She snickered. "Ohhh, Babe, I'm enjoying this way too much. I can't believe I never thought of playing like this before!"

"Sure, funny for you... I don't even want to get into what my day at work was like. If there was a camera, it would mean ten million hits on the internet, and I'd have to get a new identity."

"Hey, I told you, I'll suck that load out of you at the drop of a hat! But you'll get it extra hard tomorrow night... Believe me, I've got some devilish plans! I think you've lost your chance to have your daughter take care of that... We need to start getting her ready for camp. Where is she anyway?"

I groaned uncomfortably as I sat down at the kitchen table. "I got a text from her about 15 minutes ago. She's on her way. She was brief though, I think she's still a little embarrassed about last night."

"Well, that's totally expected. I'd be a little shocked if she wasn't. Just make sure you don't pressure her or go all 'dad' on her or something. Treat her like an adult. Ok?"

"Yeah, yeah, ignore every one of my instincts. That's the same advice you always give."

"Well, I wouldn't if they didn't make you act like such a tool!" She giggled. "Anyway, I've gotta pee. Do you want to start getting her stuff down?"

"Yeah, I've got it. I'll just be a little bow-legged walking down the stairs is all," I sighed.

Karen laughed again. God, I loved how upbeat and positive she could be, but she was really enjoying my testicular discomfort way too much. Lasting until tomorrow night? I didn't know I could.

I resolved to remember to grab a pair of Marisa's panties when I was getting her camp gear. Just in case.

Marisa arrived home shortly thereafter. She was sheepish, but gave me a big, long, warm hug when she came in. She still had her lovely smile. I did my best to treat her like she was an adult, and that the 'incident' wasn't a huge deal. I wasn't sure how to act after what else had passed between us, too, but I figured quiet, assured confidence was the best bet.

She changed, got a couple of things, and we got her into the car. I was hurting, but managed to keep it under wraps. We got to the community association parking lot and made small talk for a bit while we waited for the bus and signed a couple of forms. Marisa quickly broke off and began socializing with a couple of her bandmates. I was glad she was still interested in playing the clarinet after high school -- perhaps she would join a concert band. Karen thought it would be a good idea for her to take music in college, but I wasn't convinced. I guess, being a dad, one of my biggest concerns would be her ability to earn an income. Oh, well.

The bus pulled up, and we said our goodbyes. Marisa gave me a wet, tender kiss on the cheek as we parted, and held me close for longer than was the norm. I felt such a wave of love and joy, and a pang of sorrow that we were parting. I knew she would be back on Wednesday afternoon, but it seemed like such a long time away... Plus, at her embrace, my cock began surging, and my balls contracted painfully. I didn't know how much more of this I could take.

The evening was filled with apprehension for me. Karen and I ate dinner, watched a movie, and I looked over our stuff to make sure that everything was more or less ready for our trip to the lake on Thursday.

I thought maybe my balls were hurting a bit less, but it might have been just that I was getting used to their constant throb. As terrified as I was, I was looking forward to tomorrow night. At least I would be guaranteed some relief by then.

I had exchanged my underwear in my briefcase for a pair of Marisa's panties. I figured if I got desperate enough, I would take care of business. That was still honouring the deal. And I figured I would Skype my sister, or video it for her, and that would be in the spirit of her watching enough for me. I really did have no idea what she had in store for me tomorrow, and I definitely believed her when she said she would make things worse for me if I did lose control. Despite my discomfort, I had to admit that I was enjoying this game. And I did want to last until tomorrow night. Like finishing a marathon, or climbing a mountain or something. I wanted my sister to be proud, or impressed with my ability to see this thing through. I owed her a ton so far for all the wonder and joy I had experienced with my daughter. And more for what was to come.

We bedded down at about 10:30. Marisa wasn't permitted any electronics at the camp, so I couldn't wish her a good night. I felt a bit bad about that, but that's the way it was. I was sure she was having a good time, and it would make it all the more pleasant to see her face-to-face again.

"So, how are those balls doing?" Karen asked me with a wicked grin.

"You're not going to get tired of hearing it, are you? They're sore. Very sore."

She laughed. "No, no, probably not. Tell me again." She had such an evil smile. "How are those balls doing?"

"Sore. Blue. Throbbing. I can't really sit or walk comfortably. At least it seems to have lessened a bit since work. I thought they were gonna burst."

"Hmmm, maybe we just need to tease you more!" Wicked, cruel woman! I knew this was coming though. "I wanna suck that cock. Then I wanna ride it."

"You're the boss, Sis!" I smiled, trying not to show my grief. I threw back the covers and exposed my midsection. My cock was already stirring at her words.

"Mmmm, that cock looks delicious, Big Brother!" she breathed lustily. "You'll be able to hold back for me, right? If you get close to cumming, you let me know! You've got to guide me here. You cum, you suffer more! I'm not gonna make you, but if you do, I won't be held responsible!"

"I know, Sis, I know. You want to tease your big brother? Do it. Come on, sweet Little Sister of mine. Get that cock into your mouth. Suck it. Tease me. You think I can't take it? Do it! Suck me Baby! Suck your big brother's thick cock!"

With a laugh, she did exactly that. I inhaled sharply as she took my semi-hard rod into her wet, waiting mouth. She hummed as she licked it up and down, slurping and bobbing, teasing me to full erection. It didn't take long. In under a minute, my dick was rock-hard, raging, yearning, my balls tight and retracted. The discomfort and urgency was incredible, insistent, overpowering. I groaned and twisted as she sucked me hungrily. I was loving and dreading this all at the same time.

She sucked me deeply and intensely, slowly and torturously. She was loving having this power over me, and was playing it to the max. I groaned deeply, in pleasure, desire, and discomfort.

She traveled down my pole, trying to wrap her lips around the base. Relaxing the back of her throat, she swallowed me briefly, then ran her mouth back up to the top of my tip. Smiling and looking me in the eye, she danced her tongue on the tip of my cock, flicking and lapping, then drew me into her mouth, swallowing me back down. She deep-throated me like this several times, taking almost my entire length into her esophagus. My eyes rolled back in my head. The sensations were too intense. My balls were churning and throbbing. This was worse than last night; at least then I had the taste and feel of her sweet pussy on my tongue to give me pleasure. My cock was too close to my throbbing nuts to give me distraction.

"Sis!" I groaned. "Sis, please, let me eat you... Put your cunt on my mouth."

"No way, Bro!" she giggled. "This dick is mine, it's going in my pussy. Now."

With that, she hopped up and straddled me. She grabbed my shaft and pointed it straight up, and facing me, pressed her pussy lips against my helmet. Grinding it around a few times at her entrance to ensure lubrication, the then sat down on my cock, sighing contentedly.

I groaned loudly. The sensation was incredible. My dick was throbbing, my balls were pounding... Her pussy was so slick and so tight. I loved fucking my little sister, and she was really turned on and enthusiastic. She was owning me and loving it. I was loving it too, but I was scared as to where it would all end. Would she be even more aggressive tomorrow?

I tried to put those thoughts out of my mind. It wasn't difficult as my little sister started riding me. Sliding up and down on my cock, she let it slip just about all the way out, then drove back down deliberately to full penetration, so our bellies touched. She had a blissful smile on her face the whole time. I was so excited watching her, my whole body was alive with electric sensations.

My penis was tingling and twitching, each minute feeling was amplified a thousand times. My whole genital area felt like it was clenched tight, like a muscle in spasm, but would not let go. And it felt good.

My sister increased her pace as she bounced up and down on my rod, riding me cowgirl. "Ok, Big Brother," she breathed, "Your little sister's going to cum all over your cock. But you don't get to cum, ok? I wanna cum, and you just hold it. You tell me if you're getting close, all right?"

"Ok, Little Sister," I gasped. "I think I'm gonna be ok there, everything's sort of numb or something."

She laughed. "God, you are so sexy like this... I promise I'm gonna make you cum so hard tomorrow your hair's gonna stand on end."

I just groaned with the sensations she was giving me. My cock felt over-inflated, hard as steel and invincible. Karen bounced harder on my shaft, tilting her pelvis with every buck, rocking her hips back and forth, swallowing my cock whole with her pussy. She rode me like a wild woman, tossing her head with her hair flying. She reached down and began stroking her clit rapidly, left and right, with the fingers of her right hand.

"Oh, god, Bro," she moaned, "Oh, god, I'm gonna cum. I'm gonna cum so big.... Hold it for me, Bro... Hold it for me for tomorrow... Oh god Oh god OH GOD OH GOD OH MY GODDDDDDDDD!!!!!"

Her whole body went wild. She was twitching, shivering, pitching forth, babbling with lust as she squirted on my belly. She bobbed sensuously as she came, grinding slowly up and down on my cock. "Oh, my god, oh, Big Brother, that was so, so good... I love you so much... Oh my god, so good..."

My cock was hammering with my pulse inside her. It was weird; it felt like I was desperate to cum, or to piss, or something, but the orgasmic climb wouldn't start. I felt like I could fuck all night. As painful as it would have been to do so.

She slid her pussy off my dick slowly, drawing a gasp from me. She swooped down on it immediately, drawing it into her mouth and sucking hard. I moaned and my eyes rolled back in my head. I was gyrating and writhing as she sucked hard on my cock, vibrations and jolts of intense pleasure and throbbing need rolling through my body.

"Fuck, this cock is so hard..." she whispered lustily, grasping my member and stroking it fast and firmly, up and down. "Can you hold back? God, Big Brother, I'm loving this so much... Can you go again? I'm so horny, I wanna cum again."

"Holy shit, Sis, you're gonna kill me!" I laughed. With some reservation, I informed her that yes, in fact, I was pretty sure I could hold back. But I wasn't sure what the short or long term effects might be on my whole reproductive tract. She laughed in return, assuring me that tomorrow night, she would drain me. Completely.

She got on her hands and knees and asked me to take her from behind. My nuts throbbed painfully in horny desire at her request. I've never been big on refusing her requests, suggestions, or orders and I wasn't about to start now.

"Come on, Dear Brother," she coaxed me. "Mount your little sister. Fuck your little sister's hot cunt from behind, doggy style."

"Your wish is so my command, Sis!" I rasped. "My little sister's got the hottest, sweetest cunt anywhere, and your big brother's going to fuck you into oblivion! I'm going to fuck that sweet little cunt so hard you're gonna be having a harder time walking than me!"

"Then quit teasing and fuck me!" she challenged me.

Aggressively, I climbed on her back and placed my glans at her wet, swollen lips. Ignoring the stabbing distress in my testicles at my sudden movement, I slammed my hips forward and drove to full depth inside her in a single, savage thrust.

She cried out as I bumped her cervix, and I immediately set to vigourously and thoroughly fucking her. My balls were numb with pain now as they slapped against her clit repeatedly as I frantically drove into her. I was in some weird, robotic Nirvana, as overwhelming lust, need, pleasure, and pain wove into a bright, electric, fuchsia haze enveloping my entire being.

I was a fucking machine, battering my little sister's quivering snatch ferally, animalistically, savagely. She had awakened something primal in me. Over the last few days; inflaming a desire for my own daughter, pushing the limits of our sexual boundaries, teasing me worse than ever in my life... I viciously slammed into her again and again, reaming her pussy completely as she wailed and bleated in ecstatic surrender.

I constantly felt like I was on the verge of orgasm, yet I knew I was no where near close. Where would this end?! Would the pressure build up until something burst? In all my years of sexual awareness, this was new, different, exciting and scary!

I drove into my little sister like a rabid, mindless demon of lust. My mouth hung open, panting and growling out my passion. I grabbed a fistful of her hair. Yanking her head back, I bit into her shoulder. She wailed again in total sexual abandon. We were both reduced to animals, completely detached from consciousness, existing only to carnally join in reckless passion.

"OH GOD!" she keened. "GOD YES, FUCK ME!!" I redoubled my efforts, my whole abdomen coiled and knotted with the frantic effort of slamming my rigid cock deep into her pussy with every ounce of force I could muster. "FUCK ME HARDER, BIG BROTHER!! HARDER!!!" Summoning lust from the deepest pits of hell, I did. I rammed her cunt so hard my balls were making audible slapping sounds on her clit. My balls were past pain now.

"OH GOD I'M GONNA CUM!!!" she howled out. The she froze, rigid and motionless as I pounded into her with the force of a piledriver. Then she pitched forward and shrieked like a banshee, scores of strands of hair from her scalp coming off in my grasp as she convulsed and spasmed in colossal, total orgasm, screaming and howling.

"FUCK! ENOUGH!! ENOUGH!!! OUT!!!" she yelled finally, struggling to inhale. Knowing how sensitive she gets after orgasm, I withdrew in a single stroke as she whimpered and moaned. Immediately, my entire belly basically seized up. It was like a was running for my life or lifting five times my weight, and now that I stopped, I was feeling the burn. Big time. I gasped and gasped, trying to pay back some of the oxygen debt I had incurred. My sister was gasping equally as hard, slowly coming out of the clouds of ecstasy back into our bed.

The fire in my abdominal muscles was burning bright, I curled up and heaved in breath. Sweat had plastered my hair to my forehead, and it dripped down my face. I couldn't feel my testicles at all now, and my penis was just a surging force, blurrily pointing up, quivering lewdly with every thunderous beat of my heart.

We both lay there for some time, totally destroyed, utterly wiped out by the total crescendo of our passion. Slowly, eventually, Karen was able to move. She slid along the bed to rest her head on my chest. We laboured to control our breathing. The very air was alive with the glowing lust we had poured out.

Karen laughed as she lay on me, panting. "Holy fuck, Bro! That was fan-fucking-tastic! If this is what it's like, I might never let you cum again!"

"No deal," I gasped. "This is sort of fun, and extremely alarming." I chuckled. "You better let me cum tomorrow or I'm going to fill a tent with Marisa's panties and just live in there. And by the way, what the hell has come over you? I mean, you're the horniest bitch I know, but... Damn!"

She just laughed. "Things are different. I like it! But don't worry, I'll never get bored of sex with you, Bro. A few things are just... novel right now... and a change is as good as a rest, you know! Holy fuck though, that fuck was awwwwwesommme... Ouch." she winced a bit. Then she laughed. "You bit me, you bastard! And tore my hair out!"

"Well, it's not like I've never bit you before, and... Holy shit! I did bite you hard... Wow, that's going to leave a mark! Oops. I am sorry, Sis, and yeah, I did have a bit of your hair there..."

She just laughed again. "Oh, fuck, I'm not complaining! That's one of the best fucks we've ever had. Let's do it again! You up for it?"

We laughed together long and loud, snickering and grinning like a pair of teenagers. Then we embraced and kissed long and passionately, expressing our overflowing love for one another. "Yeah, sure, let's fuck, as long as you don't mind me being a corpse when we're finished..."

We nuzzled, and cuddled, and held one another, and, as our bodies shared warmth, slowly drifted off to sleep.I awoke the next morning, feeling surprisingly relaxed. I had warm and pleasant dreams about Marisa; the two of us laughing, smiling, running around, playing tag, building snowmen together... All in all a wonderful experience. I yawned and stretched, preparing to greet the day. I moved carefully, expecting to feel pain in my testicles as I rolled to the edge of the bed, but to my surprise it was nowhere near as bad as I anticipated.

I kissed my sister good morning and we had a shower as we prepared for the day. I was a little sad that I couldn't say good morning to my daughter, as she was away at band camp and wasn't permitted electronics, but in a way it was sweet. It made my heart long for her more. In a lot of ways it seemed that modern society was totally neurotic; instantaneous contact with anyone you like always at your fingertips. There was not the same opportunity to pine, to miss, to wonder. The feeling was like something from the days of old, where a letter traveling several weeks might separate lovers. It made me wonder if Marisa was longing for me in the same way. The sensation was delectable.

Another divine thought occurred to me - Karen and I were home, free to express and celebrate our sexuality together as we wished, in private, without fear of discovery. I knew, thanks to my devious sister, that Marisa masturbated thinking of me. Would she attempt that at camp? In a room filled with beds all containing other girls on all sides of her? Would she bring herself to climax quietly, motionlessly, thinking of me?

My dick was getting hard.

Karen noticed. She smirked. Then proceeded to tease me. Oh well, there would be no release for me. Until tonight, for good or for ill.

I thought of Marisa back in her bed last night - was she suffering the same way? Was she too shy to please herself? Lying there, yearning, needing, throbbing... Dying to touch herself, to caress her tingling labia and clitoris, to tease herself, pleasure herself, and bring herself to orgasm, thrusting and grinding against her fingers, sighing softly in lust - but unable to? Was she, like me, denied pleasure and release?

Oh, fuck, now my dick was like steel. Rigid and bobbing in the air. My nuts were starting to tighten uncomfortably - Ok, enough of this. I would see Marisa tomorrow night.

...And she was having that damned sleepover!! Oh hell, the J girls, Julie and Jamie, would be over. A flash of indignant anger swept through me. Partly out of jealousy - I wanted Marisa all to myself. And also partly because they had fed Marisa that Valium. Well, maybe they hadn't fed it to her, but they gave her access to it.

I put the whole thing out of my mind as best I could and got on with my day.

Work was nowhere near as uncomfortable as yesterday. My nuts were still a bit sore, but every time I thought of the ridiculous lengths I had gone through yesterday to obtain relief (without jacking off) I felt a flash of embarrassment and shame. Thank god no one had seen!

Each time my eyes brushed past the picture of Marisa on my desk, I felt a pang of longing, or a surge in my loins, or both. She was so beautiful! And her smile was dazzling! She was truly the apple of my eye. I couldn't wait to get her alone, hold her in my arms, kiss her soft lips, dance my tongue down her neck, between her breasts... Whew! Hard to concentrate on work. At a couple of points I was tempted to put the picture into my desk drawer so I could concentrate, but no way. She was my joy, my inspiration. There was no way I was going to try to symbolically put her out of my mind like that.

I worked, phoned, scanned, emailed and scribbled my way through the day. I was in good shape. One more day of this and I would be ahead of the game enough for a four-day weekend at the lake with my sister and my daughter. Heaven.

I finished up, closed up, and headed down to the parkade, feeling good. Then a cold sweat hit me. I had promised Karen that she could domme me tonight. And she had told me straight up that she was going to be rough on me. Then I thought about why. I had lost the bet that Karen could get Marisa's mouth around my dick. Hell, for that I'd let her domme me for a week straight! I was getting off light.

I drove home, Karen and I greeted each other with a kiss and some groping, and we had dinner out.

It was fairly rare, even now that Marisa was eighteen, that we had a full evening and night to ourselves, so we decided to make a bit of a date out of it.

Dinner was lovely, and Karen and I felt very free and flirty. It definitely seemed like some of the excitement I was developing with Marisa was spilling over into our relationship as well. Everything was wonderful. We refrained from drinking any wine, because we both wanted to be sober for what was to follow, but we both felt buzzed nonetheless.

When we arrived home, there was plenty of kissing, and squeezing, and pawing, and in general bawdy, lusty behaviour. We both wanted each other terribly badly. But games were in store, so I resisted the urge to throw her down to the kitchen floor and fuck her senseless.

We dragged the rubber pad out of storage, put some towels down on top of it, and I assembled the X-frame and attached it to the anchor points which were part of the book case frame. We'd had some time and thought put into this arrangement.

I took a pee to make sure my bladder was empty, as I was sure I wouldn't be free for some time once locked in.

I shed my clothes, and stepped into the X-frame as Karen locked the wrist and ankle cuffs, as well as the belts to hold my chest and hips in place. My heart was beating fast and my cock was at full attention.

Karen laughed as she secured the last lock. "Now I've got you right where I want you, Big Brother!" she cackled. I grinned back in spite of my fear. She looked me deep in the eyes and grasped my cock, stroking it rapidly. "This is what I want," she breathed huskily. "It's right in there. That load. I've been dying for it for the last two days. And now it's gonna be mine. All mine. You can't do a thing about it. You're totally at my mercy, helpless to do anything. Except give me your load. And you will. You will."

I moaned as she jerked me. Was she going to just go for my load right now? I gasped and twisted, and she kept up her pace. She stroked her hand up and down the shaft of my penis, up and down, up and down, as I writhed and struggled for breath, her eyes locked into mine.

I felt my load start to rise. My spine was tingling, my balls contracting and throbbing. Karen grinned and stroked even faster, yanking hard on my dick. I was moaning helplessly in her grasp, getting closer to orgasm, closer, closer...

Then she stopped dead. Releasing my throbbing prick with a laugh, she turned and left me, thrusting and groaning in lust and frustration.

"Not yet, Bro," she teased. "I want to get dressed first. Then I want to play with you for a bit. And then," she paused, coming in so close I could feel her breath on my neck, "I'm going to Suck. You. Dry."

I was panting as my heart pounded in my chest. I had no words. I just stood there, shackled and helpless with my engorged erection throbbing straight out, as my sister turned and strode upstairs, her ass swaying sensuously and deliberately with each step.

I was so turned on I couldn't think. That was probably for the best, because whenever I did, I kept trying to conjure up scenarios of what might be in store for me. No, better to just go with it. I was powerless to influence the situation at this point anyway.

I hung there and waited. My pulse rate was accelerated and my dick was hard as steel. I couldn't wait to blow my load.

Long minutes past as I stood shackled to the X-frame awaiting my little sister's mistreatments. I hoped she would let me cum first, then get up to whatever deviltry she assuredly had in store for me.

My penis was bobbing at half-mast when Karen descended the stairs again. Instantly, my dick roared to full attention when I beheld her visage. She had on black stiletto heels, thigh-high stockings with a garter belt, black lace panties and a black corset that was comprised of lace and faux-leather. She had bright red lipstick on, and her eyes were heavily made up. She looked wickedly divine and wore a facial expression to match.

Oh god! What was I in for?! She ambled towards me wearing a smirk, her hips swaying in exaggerated fashion with each stride.

She reached down and tickled the underside of my penis and chuckled as I shuddered. She lightly ran her finger up and down, gently tracing the bottom of my rigid, throbbing member and grinning at my reaction. A big glob of precum was glistening at the tip of my helmet. My sister flashed me a wicked smile, and knelt down and kissed the tip of my penis.

She looked up at me, her face a mask of dominance, lust, mischief, menace... my cock, already pounding in arousal, surged even harder with desperate need. She withdrew her lips from my dick slowly and deliberately, and a thin streamer of my precum joined us still as she drew back. It broke and swung down, streaking her lower lip and chin in a glistening, thin, clear line.

She then, ever so slowly, bent forward again to kiss the head of my prick. She made contact with my helmet, placing tender, loving kisses directly on the tip. Then she kissed more deeply, sucking gently, taking the precum I had produced into her mouth. She looked up at me again, the flame of possessed lust in her eyes. Slowly, carefully, deliberately, she ran her tongue along her glistening, parted lips, then closed and swallowed.

"Mmmmmm," she purred. "That was soooo delicious, Big Brother... you can't imagine how badly I want to eat up every drop of cum you've got built up in those balls for me... speaking of which, how are they doing?" She giggled at her query.

"They're actually doing ok..." I replied. "There was some... discomfort... but I think I'm over it now. Now they just feel full. Real full. Like I need to blow a load. Like, urgently," I added, chuckling a bit.

"Hmmm, is that so?" Karen asked, bending down further, between my legs, and twisting her neck. She gaped her mouth, and making contact with my dangling testicles, began sucking them gently. I groaned.

She increased the vacuum, and as my groan began to rise in intensity and distress, she drew them both into her mouth. Then she sucked harder, and harder... pushing her tongue into each sensitive orb, back and forth, as I began straining against my bonds.

She let her head hang down slightly, putting more weight on my scrotum and spermatic cords. She sucked harder, still prodding my trapped gonads with her tongue. I called out in increasing anguish, shaking my head and writhing in my restraints. She kept sucking harder and harder!

My eyes started bugging out of my head as I cried out. "Oh god!! Please! Sis! Aah! Sis! Fuck, it hurts! You're hurting me! Aah! Fuck! Please, Sis!!"

She let my nuts pop wetly out of her mouth with a laugh. The relief combined with the pain as I gasped and strained. "Oh, I'm hurting you? Perish the thought, Big Brother! Here you are, full to the brim and overflowing with cum, locked helpless and spread-eagled on an X-frame, and I would dare think of hurting you?"

She laughed again freely as she rose before me and I panted, feeling the alarm and pressure in my balls slowly ebb.

"Oh, fuck, you are full of cum, aren't you!" she laughed, as her gaze travelled south briefly. "Oooh, look at all that yummy percum! Mmm, I have to get all of that... so delicious... it was so yummy... I'm going to tease you until you're balls are about ready to pop!!"

She then dove down to engulf my tip, slurping gently, then licked it all over. I shivered in pleasure and lust. She swallowed, licking her lips again as she knelt in front of me, my erection surging and bobbing, pointed directly at her beautiful face.

"So is my Big Brother horny?" she cajoled me. "Does he want to blow his wad? And is he horny from thinking about his own daughter? Why, I'll bet he is!!"

She rose again, and bent forward to begin softly kissing my neck. I desperately wanted her to keep touching my dick, but dared not ask anything of her. I just prayed that she would be lenient with me, not teasing me too badly before she allowed me to cum.

Her tongue encircled my ear and I felt her hot breath. "Horny bastard," she whispered into my ear. "Hard and throbbing, thinking about your own daughter! Marisa! Your little girl! Your sweet little baby, and your dick is just dying to fuck her, isn't it!"

I just moaned as she chuckled, taking a step back to regard me with her hands on her hips. She grinned like the cat that swallowed the canary. God, she was driving me crazy!! My dick was almost hurting, it was so fucking hard, bobbing and pounding with my pulse!

Her right hand travelled between her legs and began caressing her panty-covered mound. "Mmm, you look so good like that. Totally at my mercy. You know what, Big Brother? I think for being so horny for Marisa, you should hang there all tied up like that and watch your little sister as she makes herself cum, don't you think so?"

I just moaned in desperate helplessness.

She looked directly into my eyes, pulled her panties aside with her left hand, and began fondling the folds of her pussy with her right.

She flexed her hips slightly and moaned in pleasure. I stared transfixed and immobilized, utterly captivated by the sight of my beautiful, sexy little sister unashamedly masturbating, dressed like a Dominatrix or a slut, staring directly into my soul.

She bowed her knees slightly, parting her thighs as she stroked her pussy lips. "Watch me, Big Brother," she hissed sexily, "Watch your little sister as she diddles her clit and cums right in front of you..."

This was torture!! Delicious, erotic torture... She closed her eyes and began rubbing more vigourously, moaning softly as she did so. I was going mad with desire, forced to watch, but unable to touch...

She shuddered in pleasure. Her lips were pursed, her cheeks flushed. She gently bit her lower lip and rotated hips slowly as she ground her vulva with her fingers. Her lips curled into a hint of a snarl and she gyrated her whole body slowly and sensuously. She didn't often masturbate strictly for my viewing pleasure, but regardless I couldn't remember a time when she'd looked more inviting and irresistible. I didn't know what was pounding harder, my heart or my dick.

The pace of her fingers between the folds of her pussy increased. She began flexing her hips rhythmically, grinding and gently swaying on her stilettos as she moaned in pleasure.

"Ooh!" she cooed. "Ooooh, I'm so close... Ooh, watch me... Watch me, Big Brother... Watch... I'm gonna cum... Oh, I'm gonna cum!! Oh!! Oh!! OHHHH!!"

She bucked her hips, shivering and twitching in the throes of her orgasm, moaning out loudly in passion and release.

She stumbled slightly with a laugh, and her eyes opened. I stared slack-jawed. "Mmmm, did you like that, Big Brother? Ha ha, I know you did... Look at your dick. Yeah, I bet it wants to cum too, it's been a while. Well, soon. I can't wait much longer for that load..."

She sauntered up to me and placed her fingers beneath my nose. Her scent was strong in my nostrils. I wasn't sure I could be any more wild with lust. "Open," she commanded me. "Suck."

I did so and slurped her juices off of her finger. I was buzzing with frustrated arousal. I would have done anything, absolutely anything she commanded at this point. I was putty in her hands.

"Good boy," she praised me. "Ok, this poor dick here needs some attention. He's been standing like a good soldier for so long..." she chuckled. Then she leaned forward and gave it a lick, a long, slow lick from the underside all the way up to the tip. I moaned.

She encircled the shaft with her hand and slowly began pumping. My cock was positively pounding with feral need. I couldn't even speak. All I could do was thrust my hips forward, desperately praying for my little sister to give me pleasure, relief. I was mad for it.

She stroked me up and down, slowly and deliberately, placing long, loving kisses on my helmet and shaft as she did so. She made sure I was never starting that climb towards orgasm, just teasing, teasing... keeping me at the outer limits of arousal, utterly subject to her whims.

She kisses her way down to my testicles, placing those same, long, loving kisses all over my balls. "Hey, there, little guys!" she giggled. "Are you making lots and lots of sperm for me? Why, I sure hope so! Your owner lost a bet, so it's almost time to drain you two into my mouth! Are you ready? I hope you are! I haven't had a mouthful of yummy jizz to eat up for a couple of days now!"

She stood and laughed, facing me. "Ok, Bro, I'm going to tease you a little bit more. But for this part, I'm going to blind-fold you. I have something very, very particular in mind for you today." She reached behind me and obtained a cloth, wrapping it around my eyes and securing it in place. "You're going to love it," she whispered to me. "Or maybe you won't? Either way, I sure will..."

I heard the sound of her heels, and some motion... She walked away, then returned. There were sounds of scraping or something, and wheels, like a cart of some kind. Hoo boy, I was sure I was in for it now. What it was, I wasn't sure though. Again I just tried to concentrate on the moment and not speculate as to what Karen had up her sleeve.

I jumped as I felt her fingers tickle my balls. She giggled. I gasped as a piece of cloth dragged lightly across the sensitive head of my prick. My sister leaned in and began kissing my neck. "Do you know what that was?" she breathed right into my ear. "It was a little something I grabbed just for play today..." I tried to do anything but think - just feel, just experience... best not to try to figure things out...

"I want to turn you on hotter than you ever have been," Karen continued. "I put my fingers underneath your nose because I want you to have my scent. The scent of my cunt. Your little sister's hot, juicing cunt. Ok, smell, Big Brother." She placed her fingers once again underneath my nose. The tangy, sharp aroma of her arousal filled my nostrils. "Take a big whiff. That's right. Got the scent of my cunt? Good boy. Now, here's something else. Can you guess what it is?"

She held a piece of cloth to my nose. I inhaled. Instantly my eyes opened wide as could be and my dick threatened to spew right there! "That's right, Big Brother! Those are Marisa's panties! Can you smell her? You dirty fuck. You like stealing her panties from the hamper, huh? Well, two can play that game! C'mon! Breathe deep! Do you recognize her scent?" I did!! I had only beheld her aroma once, but I swore I could recognize it! It was my little girl!!

Her fingers gently danced along the shaft of my raging rod. I moaned in helpless, overpowering lust. "Oh, you do, don't you! Mmhmm, that's Marisa! That's the scent of your daughter's cunt. Keep breathing deep! Do you remember why you're locked up like this? That's right! Because I found a way to get her mouth around your dick! Ha ha, that's right! Do you remember her sneaking her way into our bedroom? Pulling the covers back? Taking your dick into her mouth? Oh, you should have seen it! Of course, your eyes were closed, like they are right now! Ha ha! Mmmm, remember her sucking you? She brought you off like a pro! Fuck, you shot so much, right into her mouth! And then it went up her nose, remember? Ha ha ha!! But then, she was such a trooper, she helped me lick up every drop! Mmm, she was so hot!"

I was panting in lust! Every time I inhaled, I swore I could smell her! Marisa! My daughter! This was driving me beyond crazy!

"Oh, and then, do you remember?" Karen went on. "She went back into her bedroom after and jilled off, thinking about you! Calling out 'Daddy!' as she came! Oh, fuck, that was such a fucking turn on! Do you remember?"My head was whirling. I couldn't think straight. Maybe I couldn't think at all. I was all dick. I had never been this furiously aroused and teased before. I was practically drooling.

"Ok, Big Brother," she hissed right into my ear. "Now I'm going to suck you off. I'm going to eat up every bit of your cum. And then I'm going to drain you dry. I'm going to empty your balls. You're going to have nothing left. You're going to shoot until you're shooting blanks. Are you ready? Good. You're mine."

She dove down and swallowed my cock down in a single gulp. I called out in lusty anguish. She sucked. Hard and deep, she drew my cock in and began pumping aggressively. It was too much. I couldn't breathe. When I finally gasped in, Marisa's scent from her panties set my whole brain alight. I wailed in desperate heat, desire, and helplessness.

Karen sucked like a madwoman. She seized my balls and started squeezing. I sobbed out in agonized ecstasy, my senses of smell and touch completely overloaded. She vacuumed my dick and pumped her head up and down frantically. My whole body spasmed. I was trying to shoot, but the sensations were far too intense!! My brain was about to completely self-destruct! Every time I thought I was about to ejaculate, she squeezed harder on my nuts! This was way too much! I couldn't cum! I couldn't cum!!

Karen seemed to sense exactly what I was feeling every moment, and she suddenly grasped my testicles in an iron grip. She wetly released my rod from her mouth, and shouted at me, "This load should be Marisa's! But it's mine!! Every fucking bit of it is mine!! Now fucking shoot it!! Shoot it into my mouth!!"

She then released my balls, took the head of my cock in between her lips, and began beating my shaft at breakneck pace! I howled out, thrashed about, thrust my hips forward spasmodically, and came!!

It felt like my entire prostate and balls were being torn apart! I shot a gigantic wad that threatened to rip my dick open as it exited! Karen relentlessly jerked the shaft of my cock, gulped down the glob of jizz I rocketed into her mouth, and I shot, and shot, and shot. I couldn't breathe in. I tried to sob in lust, anguish, and rapturous release. Every nerve was jangling, utterly saturated and beyond with overpowering sensation.

I came and came. Karen just kept sucking, swallowing, and jerking me. I finally gasped and bleated out in passion. She kept aggressively fellating me.

My cock was just dribbling out now, but Karen kept up her assault. She sucked hard, flicking her tongue all over the over-sensitized tip of my dick as I desperately sought respite, needing a break from the electric shocks of stimulation that were ravaging the surface of my penis.

She just kept sucking. She began bobbing her head, drawing me deep into her throat as she pumped me mercilessly and unceasingly.

"Please, Sis!!" I managed to gasp. "Please!!"

She ignored me and continued her forceful blowjob. She twisted slightly, and I was barely able to register the sounds of some movement, scraping, and then something that sounded mechanical.

The warm, wet vacuum of her mouth disappeared from enveloping my dick, to be almost instantly replaced by something colder. It was very wet and slippery. And then it sucked me. Oh my god!!

It drew an incredibly powerful vacuum on my twitching, totally over-stimulated cock, then stroked down slickly, stroked back up, and began sucking even harder!!

I cried out in agonized surprise!!

The sounds of the machine now filled my ears. Oh my god, this thing was sucking me too hard!! About every second and a half, it stroked me down and up, and drew an overwhelming vacuum on my dick!!

I choked in breath and warbled in agony. My sister rose, and I heard her chuckle into my ear. "Mmmmm, that load was fucking delicious!! And huge... I don't think you've ever shot that much, ever. Yum! Totally worth the wait. But now, dear Brother... I'm afraid you're in for a bit of an ordeal! I've borrowed a toy from someone I know who knows some real kinksters! Would you like to see it? I know you can feel it! Ok, Bro, let me introduce you! Say hello to my little friend!"

With that, she removed the blindfold. As I struggled and strained against my bonds, my eyes tried to adjust to the light. Before me, on a tripod, was a small electronic pump mechanism contained in a housing about the same size, but a little longer than a lunch box. It was sucking my tortured dick unceasingly. My eyes were bugging out of my head.

"It's called a Venus2000!" my sister enthused. "Isn't it wonderful? Ok, Big Brother, you've been so horny the past couple of days, and you've wanted to cum so bad! Well, now you can! Just cum for me, ok? Cum for me and I'll let you go! Be a good boy. I know you have more sperm to shoot for me, so I want to get it all out! Ok? You know you want to cum, so just do it. Let it go. Shoot that hot stuff for me and I'll let you go free, ok? But only when I'm sure you're empty!" She cackled gleefully. I was wracked with far-too-intense friction and suction. This was too much.

I shook my head left and right helplessly and sobbed. I couldn't take this.

This diabolic contraption just kept sucking and stroking me, sucking and stroking.

"Please, Sis..." I managed to choke out.

She just laughed at my plight. "Ohh, poor baby. Didn't I tell you that you were in trouble? There's an easy way out... Just cum! That's all you have to do, my dear, sweet big brother. Just cum for me! Cum for your little sister. ...Don't you want to?"

She began kissing my neck and upper chest softly. "If you only knew how hot this is for me... You know you will cum. Right? It's only a matter of time. You'll cum for me, and I get to watch, and I don't even have to do any of the work! Come on, Big Brother, just shoot it. Shoot your cum for me to watch."

I gasped and panted as this thing just kept working my junk without pause. Slowly, slowly, I recovered from my orgasm. As I gulped in breath in tiny mouthfuls, my cruel little sister stroked my face and neck, grinning mischievously the whole time.

I groaned deeply. She was right. As much as I was totally overloaded with unceasing stimuli, I felt my orgasm begin to grow. It started like a spark, a smoldering brand. It began to catch, tingling in the soles of my feet, sweeping upwards... my balls and my prostate started twitching and fluttering... my abs contracted... Oh, fuck, this merciless machine was going to make me cum again... Fuck, I was going to cum hard!!

"Oh god!" I barked out. "Oh, fuck!! Sis!! Oh, god, Sis, I'm gonna... I'm gonna AH! AH! Sis, oh fuck!! I'm gonna cum!! AH!! AHH!! AAAAAAHHHHHH!!"

"Good boy!!" she cheered. "Good boy!! Yeah, that's right! I knew you would!! Shoot it for me, oh, yes, keep shooting!! God, that's fucking hot!! Ha, ha!! Yeah, yeah, perfect!! Ooooh, that was sooo good, wasn't it? Ha, ha, look at you! No breaks! One more!! One more, ok? One more and I'll let you go!!"

"Please, Sis!" I howled. "Please, no!! Please!! Please, stop, please!!" The machine didn't miss a beat. Like clockwork. Relentless. It didn't matter whether I was climbing the slope to orgasm, shooting my brains out, or desperately, hopelessly trying to recover, it just kept on. Sucking and stroking. Sucking and stroking. Sucking and stroking.

"No..." I whimpered. My entire body was twitching, struggling feebly, uselessly. "Please, no..."

I sobbed and sobbed. The slippery friction and suction on my ravaged prong continued unabated.

I hung there limply as my sister crooned to me. "Yes, yes, my love. My big brother. My horny, helpless big brother. Yes. Are you sensitive? Why, I'll just bet you are. Look at you. Mmmm, that looks so good... It's driving you mad, isn't it?" She giggled. I could barely breathe.

The machine sucked and sucked. This was far too much. I couldn't endure. Yet there was no other option.

"One more!" Karen gushed. "One more orgasm, Big Brother! That's all you have to give me, and I'll make it stop! Just one more!"

"No..." I choked. My penis was immolating with over-stimulation.

My sister began gently flicking her tongue up and down my neck and throat. She kissed her way down to my nipples and gently sucked each one softly.

Then she kissed her way back up to my ear. Cupping my testicles, she whispered, "This one is for Marisa. Come on, Big Brother. Do it. Do it for her. Come for your little girl."

I moaned and sobbed. My breath was caught short as I was mercilessly, ceaselessly milked by the Venus2000. "Come on, Bro," Karen went on. "Everything these balls have been making was supposed to have been for her anyway, right? So shoot for her. You know she wants it. Do you remember? It was her sucking your cock. That's right, Bro, your own daughter had your dick in her mouth. That was her, bobbing and sucking... you were the first cock she ever had in her mouth. And you know what? She loved it! That's right, it was love at first suck. Remember how she said your cock was beautiful? Ha ha, I do! She said it was the most beautiful thing she'd ever seen! She was in love with that beautiful cock of yours before she ever saw it, but when she did, you know she'll never look at another. That's it for her, there's only one cock she's ever really going to crave and yearn for. Yours. Her Daddy's cock. I'll bet she's yearning for it right now."

I shook my head back and forth, unable to speak. All my muscles contracted involuntarily, convulsively, uselessly struggling. My mind was racing and whirling. Despite my crushing anguish, Karen's words in my ear kept my memory flashing back. Marisa's beautiful face. Her flashing smile. Her burbling laugh. And lord, the sensation of her lips against mine, the agonizing, glorious suction of her immaculate mouth on my penis...

"Do you remember her sucking your cock?" Karen went on. "You came, right in her mouth. She wasn't ready for it completely, but she wanted it. And then she helped me lick it up. Your own sweet, beautiful daughter, helping your little sister lick up every drop of cum off your body. Remember that? Then she went up to her room to bed. She jilled off, thinking of you. Wanting you. Wishing it was you. She diddled her little clitty right up there in her bedroom, fantasizing about you. Whispering out for you. You know she would have been screaming for you if she wasn't scared of getting caught... Do you suppose she's doing that right now? Masturbating at camp? Not daring to move, just stroking her clitty? Jilling off softly, nearly motionlessly, whispering, 'Daddy, Daddy,' wishing she could scream it out? Do you think maybe she's getting ready to cum right now?"

"OH!!" I managed to gasp out. "OH! OH GOD!!"

My cock was buzzing, vibrating. My whole body was swept with fever and chills. I was sweating, and I was burning up. I was past crazy. This machine just kept pumping on and on, and I was powerless to stop it. My sister was cruel and relentless. Yet, her words, and the inevitability and unavoidability of the machine's conscienceless actions were drawing forward to their conclusion. I was going to cum again.

"That's right!" Karen rasped, excitedly. "You know she is! She's going to cum for you, tonight! For sure! Maybe right now!"

She began soft squeezes on my balls, which built up slowly in intensity. My breath was blasting in and out now. The friction of the Venus on my dick was agony, but was breaching the border toward ecstasy. My balls, already throbbing, were being increasingly aggressively kneaded and wrung by my wicked little sister. Helpless, I could do nothing to thwart her will or the mechanical assault on my member that was accelerating me past light speed towards an orgasm that threatened to end the whole universe.

"AAAAH!" I half choked, half screamed. "AAAAH! AAAAAHH!!"

Karen's grip on my balls was now a crushing vice. Timing her squeezes with the reciprocations of each suction cycle. It would have likely been wracking agony, but my brain was utterly flooded with a molten euphoria, and every sensation that should have been pain, would have been pain, was pain, transformed into rapturous joy. I was on the edge. About to shoot. About to cum. Ejaculation imminent. Yet I could not initiate. The first blast of my emission would not commence. I was trapped at the edge of the cliff, and it yawned before me, deeper, ever deeper, yet I could not plunge over.

"AAAAAAH HAHH HAAAHH HAAAH!!" I sobbed, howled, screamed and roared, tortured and driven beyond mindlessness.

"DO IT!" Karen yelled at me, breaking the spell of this agonizing, endless tease. "SHOOT IT FOR MARISA!! SHOOT IT NOW!!"

"OH GOD!!" I roared. "MARISA!! ...KAREN!! MARISAAAAA!!"

And I shot. As Karen wrung my balls in her grip of steel, I shot and shot a dry, empty, pounding orgasm that continued on and on, for what had to be over a minute.

Blasts and surges of colour and light shot through my brain and my prostate hammered and throbbed, launching forth wad after wad of absolute nothingness. My brain was totally short-circuited. Conscious thought was not possible. My nervous system was unable to register or differentiate whether this was celestial bliss, or infernal torment.

I slowly became aware that the machine had slowed down. The intensity and frequency of the suction and pumping were lessening. In a short period of time, they had ceased all together.

I sobbed, gulping in breath every ten seconds or so, which was all I seemed to be able to manage. My brain slowly rebooted, and sought out pathways of thought that were complete. It was a difficult and lengthy process. Karen carefully extracted me from the Venus2000, softly muttering endearments to me and caressing me gently. My whole body was energized with electricity, and her slightest touch gracing my skin traced trails of fire, ice, sparks and steam wherever they danced.

I heard the clicking sounds of the clasps releasing, but I could not feel it. My inanimate limbs simply surrendered to gravity, dangling limply and disinterestedly where they hung.

Karen supported me as she released my hips and torso from the X-frame, and I fell. She impeded my descent to the floor somewhat, and the two of us tumbled gently onto the carpet.

My cock was an odd buzz of jangled, fried nerves. It was rigid and throbbing. My whole body was trembling.

"Are you ok, Bro?" Karen giggled. "I know that was a lot to endure. I don't know where you're at, but I thought that was fucking awesome..."

"I..." I gasped. "I... I..." My brain was still struggling to do things like compose a sentence. "I'm not sure how that was..."

She chuckled again as she cradled my exhausted and inactive form. "Well, that sounds like it was better that horrible. That was intense. Like, I can't even describe how much. I don't know how much this is because of Marisa, and how much because of the tease, and how much because of that lovely little piece of technology, but wow... Just, wow!"

"I don't know what to think..." I managed to garble. "I don't even know that I can think..."

"That's ok," she smiled, "That's ok. Just take your time. When you can think, I'll remind you how risky it might be to make bets with me... " She laughed gently. "You seem ok. Just relax. I'll be super nice here. Just gentle loves. I'll lie here with you as long as you need. Until you're ready to walk." She paused and just held me as I trembled and trembled. Slowly, slowly, the alarm and stimulation level of my nerves began to recede, I got control of my breathing, and my heart rate slowed somewhat. "And if you can't walk, or you just don't want to, we can sleep down here tonight, ok? I've got some blankets and a foam mattress sorta handy."

I drew in breaths. They became more even now and I closed my eyes, creeping my way back down to a more relaxed state, just coasting, floating, settling back into my body, shielded and comforted by my sister's loving arms.

"That's a boy," she encouraged me. "You're ok. That was so hard on you, I could see. But you're ok. You'll be fine... But..." she chuckled. "What's this?" She directed her gaze down to my midsection.

My erection was fierce and rigid. My prostate felt like it was in a continuous state of contraction, and my shaft was unyieldingly projected straight out from my pelvis.

"I dunno," I mumbled. "Don't think I can really feel much. I mean, um... I don't really know." I fumbled for thoughts that would describe my sensations. "Well, it's not painful... I totally thought it would be. Or did I? Shit, I don't even know... My balls are sore, that's for sure... My dick? It's... uh, it's kind of... fuzzy."

"Fuzzy, huh?" she chuckled. "Looks more like it's... hard. Fucking hard as a rock and throbbing. I would have thought it would have been trying to hide inside your body or something." She laughed gently as she held me. I managed a bit of a chuckle.

"Yeah, I dunno, I can't really feel much. It definitely doesn't hurt... it's more like, oh, hell, um, like when you're sore from a workout? Like, it's sore, but it's a good kind of sore."

"Oh, yeah?" she grinned. "Well, I don't want to seem selfish or insensitive... But I'd hate to let a good hardon go to waste. I've got a bit of an urge here... Think you could handle if I hopped on and went for a ride?"

"Holy fuck, you are some kind of a sadistic sex fiend!" I laughed. "Well, I dunno, it doesn't hurt... It sure doesn't feel like it's going away... We could give it a try?"

Karen cackled with amusement and excitement. "Fuck, you're amazing! Really? Mmmm, that's fantastic... Ok, but be real careful here, ok? If I'm hurting you or anything, you gotta tell me. And if anything looks or feels wrong, I'm off, like right now. You sure you're ok with this?"

"Well, I dunno! Let's try it and see what happens, ok?

Karen laid me down and stretched out, trying to relax completely and still the trembling in my limbs. My cock pointed straight up, undaunted and unwavering. Karen licked her lips, stared deep into my eyes with a fire of passion, straddled me and slid down on my pole with a gasp.

Her eyes shut and she impaled her slick and sopping pussy on my column of raging manhood.

"Oh, fuck!" she breathed. "Oh, fuck, that's fantastic! Fuck, you're so hard, you're so fucking hard, and I'm sooooo turned on..."

I just stared silently at her lustful form. She slowly raised and lowered herself onto my rod, down to the hilt, and up so just the tip was buried. I was mesmerized.

It's not like my penis felt nothing at all, but as over-stimulated as it was, the well-lubricated friction of her soaked snatch on my shaft was more like an echo of a bird call, rather than the screech of an owl in a nearby tree, like it usually was.

She rode me more quickly, opening her eyes to observe me. "You ok?" she gasped in between bounces.

"Yeah," I panted. "Yeah, I'm fine. You can go harder or faster. I'm fine. C'mon Sis, ride me. Go. Come on."

She moaned, and leaned back, placing her right hand behind her for support and reaching up with her left hand to cup her breast. She surrendered to her need, apparently satisfied that I was up for this completely. Grinding and rotating her hips, she bucked up and down, pinching and squeezing her nipple as she sighed and panted.

"Oh, Bro, this is so hot, I'm so fuckin' turned on, oh, Bro, oh, fuck, oh, mmmm, I'm gonna, I'm gonna, I'm gonna CUMMMMMM!!"

She wailed out and froze, then pitching forward spasmodically, she screamed and came hard, flooding my whole groin with her dripping nectar. She lurched a few more times, mewling and biting her lip, then dismounted with a whimper and a shudder, collapsing on top of our sweating forms.

"Oh, my god, Bro, that was fantastic... You're fantastic... I love you so much..." she purred contentedly.

"You too, Sis," I replied. "I couldn't be luckier. Even when you're cruel and evil, you're still an absolute dream." chuckled and sighed, cuddling in to me. "Wow, tonight has been amazing. This is definitely one for the books. But what..." she looked down again as her thigh brushed my still-turgid erection, and laughed. "My god, you're more of a machine than that thing!" She glanced over to the inert Venus2000, and back to my glistening rod. "...Do you think you could go again?"

"Well, shit, I dunno, Sis, let's find out!"

I could. And I did. Again. And again. I had my little sister screaming and howling in orgasm after orgasm, as once I started to recover, I took more of an active role in our fucking.

I rolled her over onto her hands and knees and took her doggy style. I sat her on the couch and fucked her missionary with her legs in the air. I fucked her standing up in the corner, holding her half-aloft by her hips as I drove into her. I made her cum again and again, and my dick never once wavered in its rigidity.

I turned the tables on her too, as once, she rode me reverse-cowgirl and made herself cum by diddling her clit, she called out, "OH! OH FUCK! OK! ENOUGH! TOO SENSITIVE!! ENOUGH!!" I just chuckled and held her on top of me and kept thrusting my hips and driving into her. "FUCK!" She barked out, struggling to suck in breath. "FUCK! FUCK, FUCK, FUCK, FUUUUCCCCKKKK!!" And as I drove into her hard and fast, she came again, hard and deeply, about thirty seconds after her first orgasm abated.

I slowly took her down from the second orgasm, gently withdrawing and stroking her back and buttocks as she shivered and trembled.

"You bastard," she chuckled. "This was my night to domme. Next time I'll show you no mercy at all."

We laughed together, cuddling and holding each other. After about five minutes, we both glanced down at my undaunted, seemingly eternal boner. "Um, again?" Karen asked. "We should be careful though, right? Persisting longer than four hours or something?"

"We'll monitor it," I replied. We made soft, tender, gentle love together, slowly and sensuously twisting and entwining, pressing against each other, holding, caressing, fondling, kissing, rolling and rocking. It lasted for about a half an hour and ended with my little sister softly trembling and shuddering as a sweet, subtle orgasm gently tremored through her.

We ended up on the carpet, wrapped in blankets, holding each other and cuddling as we both drifted off to sleep, my erection pressed up against the small of her back.