PRESSED TOGETHER WITH SISTER

ersistent Genital Arousal Disorder (PGAD) is a real condition which was formally documented a few short years ago. Its main manifestation is causing constant, or near-constant, physical arousal.

My head spun as Lily sat there explaining all of this with precise medical detail. She was an athlete, not a doctor, yet she knew this information with seemingly perfect accuracy.

"Why are you telling me this?" I asked, baffled by the lecture.

Lily pursed her lips tightly. "Well, apparently my spinal procedure had a few adverse side effects."

She was referring to a minor spinal procedure which resulted from an accident while training. As a hyperactive 19 year old, Lily had fallen in love with competitive horse riding during her spare time. Without going into unnecessary details, she's involved in competitions where the horse would jump obstacles and so forth.

It was fitting for her competitive nature.

Training was going fantastic, until the day she lost control for just a moment. She fell off, and her lower back collided with the ground, requiring a minor procedure to repair a few nerve endings.

An awkward tension rose between us as Lily announced that she had PGAD, or whatever the heck that was. Our parents were at work and we were home alone at the family ranch in Colorado thanks to the winter break from college.

"So...you...have that?" I asked cautiously.

Lily gave a shy nod. "A mild case, it seems. The doctors are still going over it and I'm scheduled for a corrective procedure in a few weeks."

The awkwardness still lingered. I mean, what else was I supposed to say? This was all very weird for me (and Lily especially, I'd imagine). A flurry of inappropriate thoughts came to mind, but I tried to push them away. This was my sister, after all. I didn't want to imagine what she'd been going through.

"I'm speechless," was all I managed to say.

"Don't be, because I need your help."

"Sure, anything."

"Anything?" she asked with an arched eyebrow.

I gave a joking sigh. "Something tells me I won't enjoy this."

"Be my unofficial partner for a while. At least until my condition gets resolved."

"You don't need a partner to ride a horse," I pointed out.

She pursed her lips again. "It'll be beneficial to have a partner given my injury. For safety, that's all. I'm medically cleared to ride and I want to keep my skills sharp."

"But why not stick with your instructor or training partner?"

"I'd rather avoid using those people until my medical issue gets fixed. In the meantime, I think I'd rather do the workouts outside."

This was puzzling to me. "Why?"

"It's complicated," she answered vaguely.

"Okay, then why not do the light workouts with your trainer? He's the expert on horse riding."

"Because of my condition," she said, pointing to her lower back. "Or maybe I should be pointing somewhere else, like my vagina for instance."

I was shocked by her candor, and she nearly giggled at my expression.

"Okay, that wasn't weird at all," I said sarcastically. "How bad is it? I mean, can't you hide it from your trainer?"

"The thing is, fast or bumpy movements tend to trigger -- you know --- my PGAD condition. So obviously if I ride a horse, it'll be super embarrassing."

"What would happen?"

"Orgasm," she said with a straight face.

The awkwardness reached a whole new level. Now there was a sense of medical necessity involved here.

Then it hit me:

"You should skip the upcoming event and wait until next summer's competition," I suggested. "Just rest, relax, and get your issue fixed."

"Skip the event in February?"

"Yeah. Big deal. You're young. There's plenty of time for you to do things like this."

She roared with laughter. "What else am I supposed to do during my winter break? Stay indoors?"

"Well, yeah. That's what normal college students do. Especially when the weather sucks."

"I can adapt to any weather situation."

A typical Lily response, I thought.

I pointed to the window. "It's cold and snowy outside. If you're going to train, I suggest sticking with the facility. Just explain it to your coach. He'll understand. Or you can just try to hide whatever condition you have."

"Oh really?" she asked with crossed arms. "I should explain to the coach that I might cum every time the horse jumps? Maybe I should bring paper towels with me in case I start cumming all over the saddle. Catch my drift?"

The girl had a point. But that raised the obvious question...

"Wouldn't the situation be worse with me, though?" I had to ask. "I mean, you're afraid of having those issues with other people, but not me? It should be the other way around."

She shrugged. "To be honest, I really don't care what you think."

"Gee, thanks. That was nice."

"I'm only joking. Seriously though, I feel more comfortable with you. I've caught you jerking off many times, so I guess this kind of evens things out."

"Oh, right," I blushed.

"Does this mean you're coming?"

"No pun intended, right?"

She laughed, "Guess not. Look, I'm going to ride that horse no matter what. Do you want to ride with me to make sure I don't fall again? Yes or no?"

"Lily," I sighed. "If you're not fully healed, you shouldn't be doing this."

"I'm healed enough. I already have doctor's clearance. It's just...I'd feel safer if someone was riding with me. You know, to have someone literally watching my back during my first training session since the incident."

Her voice softened during that last part and her eyes were like puppy dog eyes. It was her way of putting me on a guilt trip. And you know what? It always worked. Lily put on a cute face to match her bubbly personality, and no one could possibly turn her down.

"Fine," I sighed. "When do you want to do it?"

She smiled, "Right now. Let's do it before mom or dad get home. They'll freak out if they saw me doing jumps."

That last part instantly rattled me.

"Jumps? With your condition?"

"Yeah, sure," she replied.

"Let me get this straight. You have PGAD and you're going to do jumps? Seriously?"

She winked, "What's the worst that can happen?"

"Please tell me this is a joke."

She breathed a long sigh. "You think I'd research all this stuff to play a joke on you? Believe me, having you hold my back isn't on my wishlist. Trust me, this is a necessity."

"But what happens when your PGAD kicks in during the ride?"

"What's the matter? Never given a girl an orgasm before?"

I tensed. "Sure I have. Plenty."

"Then the problem is?"

Clearly, she didn't understand the potential (and apparently very likely) danger that we'd be headed into. But then again, that's Lily for you. She's fearless. A risk taker. A thrill seeker. Often times she'd do things without fully thinking them through. Sometimes it would work. Sometimes not.

This seemed like one of those times where she was headed towards a bizarre conclusion (and with me of all people!). Nevertheless, this was her passion in life, and she wasn't going to spend the rest of the holiday break from college sitting around doing nothing at home.

"Let's hope this goes smoothly," I said.

She smiled, "We'll see."

"Have you actually ridden a horse since you were diagnosed with, whatever it was called?"

"Actually, not yet. We'll see how it goes. I mainly notice the effects of the condition when I'm riding in a car, or random moments throughout the day."

I gave her an alarmed look. "Don't you think it could be dangerous for you to ride a horse then? This would be way bumpier than a car ride."

"Don't be a pussy," she said bluntly.

"It's your decision," I said, giving up. "But if things get humiliating for you, that's your problem. Remember, you were the one who asked for this."

"And I thank you for it. I'll tell you what; if I place in the top 3 for the competition, I'll give you half my winnings."

"I can't accept that. It's all yours."

"Then I'll buy you burgers," she offered.

I nodded. "That's a deal, then."

"Great! Change your clothes and we'll go for a ride."

"Maybe we should wait until tomorrow," I said, looking at the window.

The weather outside looked rigid. The once green scenery had mostly turned white thanks to the snow. Temperatures were dropping. It was nothing dangerous, but it wasn't exactly convenient, either.

Lily was persistent. "The competition is in a few months and if I don't start training now, I'm sure to be a loser at the event."

She had a point.

"Let's get started then," I said. "This weather certainly isn't getting any better."

"Doing long jumps will keep us warm," she said with a mischievous grin.

So she had planned to do long jumps? With her condition? With me pressed against her? This was going to be an interesting experience...

***

It only took about ten minutes for us to get ready, switching from our comfortable home clothes to our thick sweaters and heavy jackets. The weather looked stable and the sky was a light shade of gray. A thin layer of snow had covered the dirt and grass.

As I waited outside, Lily came walking towards me pulling her quarter horse behind her with the rein. She looked ready to go, excited too, dressed in a similar fashion as me with thick, warm clothes.

When we both got together, Lily was the first to climb on top of the horse to position herself on the saddle. When I tried to climb behind her, she stopped me.

"Hang on," she paused, thinking to herself. "I can't guide properly with this big jacket on."

"It's not like you have much choice."

"Oh yes, I do."

Lily pulled her big jacket off and tossed it to the ground.

"You'll be freezing," I pointed out.

"The ride should warm me up. I can't do the jumps with that jacket on."

"We better hurry."

"Yeah, come on!"

I could tell Lily was a little nervous being back on her horse again, although she tried not to show it. Despite my earlier trepidation, I was glad I could be there for her. I wrapped my arms around her as we started moving, pressed together in the saddle. I was comfortable on a horse, but I didn't ride at the level Lily did. As much as I didn't want to touch her if she was going to have...an episode, I didn't want to fall off, either.

We started cantering, building up speed as she led us to the trails. Try as I might to think of anything else, the only thing that kept popping into my head was how all this sliding back and forth must feel for Lily in her condition. She didn't say or do anything, though, so I tried to take my mind off of it by thinking about baseball and what we would have for dinner.

Picking up speed, we approached the first jump. I could feel Lily shaking from the cold and I pulled her closer, trying to warm her up. She ignored me and leaned forward as the creek came into view. I could feel her stomach muscles clenching, and I hoped to god it was just from the cold. Suddenly we were in the air, and the horse landed with a sharp thud on the other side.

Lily cried out, her body shaking and sweating despite the frigid weather. I could feel all of this as I was squeezing her tightly to keep from falling off, my head pressing hard against her back. I let her go as she slowed down, trying not to freak out.

"Lil, what the hell just happened?"

She was panting at this point and she stopped the horse, turning him around.

"You know what just happened."

I did, as much as I didn't want to admit it. I was suddenly aware of her tight ass pressing against my growing hard on, and I tried to scoot back a little but there wasn't a lot of room in the saddle. I shouldn't have felt that way. She was my sister for god's sake, but the thought of her just having cum in my arms was too much for me.

Her shivering was out of control at this point, and I was worried she overdid it, in more ways than one. We rushed back home and I was in the unusual position of having to care for my shivering, orgasm-overwhelmed sister, a responsibility I never expected. I thought quickly about how to treat her, and the first thing that came to mind was a hot bath. Normally, she'd have done this herself. But the brotherly side of me needed to prepare this for her, since she had a minor spinal issue, and she was pursuing her passion.

I climbed off the horse first, then helped Lily down. There was a wet patch between her legs from the orgasm. She shivered from the cold (and possibly from the intense feelings she just had).

After tying the reins to the fence in front of our home, I took Lily by the arm and rushed her inside. We removed our shoes and I took her straight to the upstairs bathroom.

I filled the tub with warm water so she could immerse herself in heat. Steam was filling the room as the water continued to pour into the tub. The warmth felt nice.

When I turned around, Lily had already begun to strip in the doorway. Her pants were off and she was already barefoot. She had great legs, toned and athletic from all the sports she played. Surprisingly, off came her thin sweater, and she stood there in nothing but her undergarments.

I tried not to look too closely, but I saw that the front of her panties were stained and there was a wetness on her thighs. She was slightly hunched over and she used her arms to cover her chest.

"You better get in the bath now," I said, trying not to stare at that glorious body of hers. "I'll go."

"Wait," she whispered as I tried to squeeze past her.

"Yes?"

She tightened her lips briefly. "I need something else. It still aches between my legs. I...didn't finish."

"You mean...you didn't finish...." I couldn't bring myself to finish that sentence.

Lily nodded. "I haven't finished cumming yet. I mean, I already came...a few times. But I need to cum again. God, this is so fucking humiliating. I'm such an idiot."

"You're not an idiot. I...ummm...I'm sure you can take care of that in the bath."

"With my fingers?"

"What else?"

"My fingers can't go deep enough," she admitted. "I mean, I need something else."

The awkwardness hit record levels as Lily struggled to find the courage to ask. I struggled to find the courage as well.

"Something else, like?"

"Your cock?" she said shyly.

"Really?"

"Please? It'll be our secret. I really, really need this. It's driving me crazy."

With that, Lily pulled her panties down while the embarrassed expression remained on her face. Her crotch was neatly shaved, and I could see how wet she was. I was frozen in place as she reached behind and took off her bra. Her tits were amazing, smallish but perky, and her little pink nipples were hard as rocks. I could feel my dick getting stiff at the sight of her, and thoughts of fucking her ran through my head on a loop.

I couldn't do that, could I? She was my sister! But here she was, begging me to put my cock in her. It was for a medical condition, though, and that made it okay, right? I mean, she was in need, and I was the only one who could help her.

As I stood there trying to justify this whole crazy thing, she came over and made the decision for me, pulling my clothes off and grabbing my cock before I even realized what was happening. She stroked me a few times and I groaned, closing my eyes at the sensations. It had been awhile since I'd been with anyone, and what she was doing felt amazing.

She turned around and put her hands on the sink, spreading her legs.

"Please, please put it in me? I'm dying here."

At that point, I felt like I would explode if I didn't do what she was begging me to do. What she was doing to me felt so good. And she looked so beautiful in her naked and highly sexual state. Sister or not, who in the world could resist this?

She must have sensed my own desires, knowing that I was ready and willing to fuck. She used my cock as a leash, pulling me over to the sink, where she bent over and rested her forearms on the countertop. She looked straight into the mirror. She wiggled her butt in a tempting and begging fashion.

"Please?" she said in an innocent voice. "Can't you see how wet I am?"

As she wiggled her butt again, I glanced down to look at her pussy and slipped a single finger inside her cunt. God, she was right--she was so fucking wet and aching to be fucked.

"The things I do for my sister," I moaned.

Throwing caution to the wind, I firmly grabbed Lily by the hips to straighten her position. She smiled at my aggression, which I saw in the mirror. I held her waist with one hand, then with my other hand, I guided my cock to her little pink hole.

She was so hot and wet, she didn't even need preparation. She was already ready. Her cunt was perfectly primed for a hard fuck. I did my best to give that to her.

With a hard thrust, I shoved myself all the way inside her pussy and her body stiffened. I clenched both of her hips and began to pound her. Lily screamed out loud. She didn't bother to restrain her vocals. Why should she? We were home alone and she could scream as loud as she wanted, releasing all those torturous feelings from deep inside of her.

"Oh fuck!!!!!" she screamed at the top of her lungs.

Then suddenly, I felt a rush of fluids shooting from her pussy, drenching both of our bodies. What a real mess she had made, but who cares? That could always be cleaned later.

Lily's hand reached back and tapped my leg. "Stop! Stop! Stop!"

Her voice was low and panting, and I pulled out of her pussy, leaving my cock in a throbbing state of despair.

"What's wrong?" I asked, wanting to fuck again as soon as possible.

She breathed hard. "Nothing's wrong. That took care of everything. Thanks so much. Jeez, you're the best."

My sister was fully 'healed' for the time being, and I was stuck in the awkward position with the throbbing between my legs.

"So can we, you know, finish?" I asked weirdly, pointing to my still hard cock.

Lily hunched over momentarily, then struggled to stand upright.

"I'm sorry," she said with a sense of regret. "I really need a hot bath now and my pussy is worn-out. Besides, I'm the one with the condition. Not you."

The sadness washed over me, knowing that I couldn't continue fucking her. But I had to remind myself that this was so wrong. She's my sister!

I nervously replied, "Of course. You really need a hot bath. Do you want me to help with your condition, I mean, you know, later on? If it happens again, I mean."

"Maybe," Lily sighed to herself. "God, I can't wait until mom gets home. She's been doing a great job with this."

That comment immediately grabbed my attention. Did she really just imply something so shocking?

"What did you mean by that?"

Lily looked flustered. "Ummm....well....you get the idea."

"Really?"

"Yeah, well mom gives great massages," she said with a tensed body. "She offered to help with my temporary condition after I couldn't stop crying."

It made sense too, since our mother is a masseuse who works privately meeting with clients. She's great at her job, and she's the most loving, caring mother imaginable. It made sense that she'd do something like this for Lily, and more importantly, she'd be good at it!

My mind raced with all sorts of naughty images of our mother giving erotic massages to Lily's pussy. Them having incestuous lesbian relations under the guise of Lily's temporary condition. God, the thought made my cock ache.

Lily suddenly look flustered, with her eyes now turning into the hallway. Her eyes had become wide as saucers.

She struggled to let the words out. "Oh....my...god..."

I turned to see what Lily was looking at, and there was our mother, back home already after a session with a client. Mom was still dressed in her masseur clothes, with a completely shell-shocked expression on her face. How much had she seen? Would she ever forgive us?

Worse, my cock was still exposed, raging hard and wet from Lily's squirt. And Lily was butt naked standing beside me.All I knew is that our household would never be the same again.

***

Mom pulled me to her bedroom with a hurried nervousness and we stood right next to the bed. She had already closed the bathroom door so Lily could have privacy and take a much needed hot bath.

So there we were. Mom and I. She looked like a typical, concerned mother with a stressed look on her face, after watching her only two adult children fucking a moment ago. We just stared at each other for a long moment as she tried to find the words. But the words struggled to come.

Mom forced the words out. "I finished work early and wanted to check on Lily. I saw the horse tied in front of our house and I wondered if something was wrong. When I came up stairs, I saw you two having intercourse."

It sounded like every mother's bizarre nightmare; their grown children fucking in the bathroom.

"I don't know what to say, mom. Lily really wanted to go horseback riding because the competition is coming up. And...and..."

"Don't blame yourself," mom said, calming down. "I should have been more open about your sister's condition. It's my fault, I screwed up."

I raised an eyebrow. "So did you really do stuff for Lily?"

"I had no other choice," she acknowledged. "I did what I could to help her condition. She was inconsolable and I promised to do my best. I'll do anything for my children. You'll understand someday."

"I already understand."

She managed to crack a smile, "Apparently you have the same affection for Lily. You looked like you were enjoying yourself with her in the bathroom."

"Oh," I blushed. "Sorry you had to see that."

"It was totally inappropriate, but a sweet gesture nonetheless."

"So you're not mad?"

Mom shook her head. "We should help however we can, within reason, of course. This can't go too far though."

"Does dad know?"

"It's complicated," mom sighed. "I'll leave it at that."

She clearly didn't want to get into it, so I left the issue alone. We were silent for a few seconds and I was glad that mom wasn't freaked out over the fact that I had just been fucking Lily in the bathroom.

"Well, I'm sure you're tired from work. And I think I need a nap after everything that's happened."

"And an orgasm too, I suppose," mom said with a playful smirk.

I blushed, "Huh?"

"I heard what Lily said to you. About not letting you cum. She's right, you know? She has a legitimate condition, you don't."

"Oh, yeah. Well, anything I can do to help."

"I thought that was sweet though," mom said. "Especially the fact that you didn't beg her to make you cum. You just respected her wishes. That's very kind hearted of you. You've been very mature about everything."

"Thanks."

She smiled, "I'll make you a deal. I want you to keep taking care of Lily during her training. Horseback riding is her dream, and I'll never stand in the way of my children's dreams. So if you keep her warm during training, and ride with her, and help with whatever needs she may have, then I'll be glad to repay the favor."

Now this was getting interesting. And there was a strange expression in mom's eyes, like she knew what she was doing.

"Are you sure?"

"Yes," mom said. "Think of this as payment and gratitude for your work. I'll give you an orgasm in return."

My cock stirred. "In what way?"

"I don't know. This is my first time thinking about it. How about oral? I know that's something youngsters are particularly fond of."

It was music to my ears, even though this was my mother of all people. After having just fucked Lily, that incestuous line had already been crossed, and I desperately needed the release.

"Deal," I said.

Mom tensed really hard and her lips stiffened. Clearly, mom hadn't thought this through. It was purely a loving gesture on her part. And now she had to follow through with the deal. I instantly felt horrible and perverted for even accepting the deal, and I had to let mom know that.

"You don't have to do this," I said, blatantly reversing position for the sake of sparing my mother. "It's fine, really."

Mom tensed again. "Please, I insist. I appreciate what you've done for Lily and you should be rewarded for your duties."

There was a powerful feeling as mom took a big gulp, followed by a deep breath, then she casually got down on her knees. I froze. All I could do was look down at my respectable mother undoing my pants, freeing my erection, with my aching cock dangling in front of her face. To make matters even more awkward, my cock was still wet from Lily's vaginal and orgasmic fluids.

Mom was taken aback by this, knowing that she was about to taste her own daughter's pussy. Would it be for the first time? I don't know. I had no idea what mom and Lily had done together. And I didn't want to ask at that point. It was a question for later.

"I completely forgot that you had just been inside Lily," mom said, looking intensely at my wet cock.

"So, should we stop this?" I asked, praying that this would continue.

"It's fine. It's just that your penis was deep inside her, that's all."

Her left hand cupped my balls, and her right hand held my shaft, which was turning erect again. Her hands were the perfect balance of feminine and firm. She had a soft womanly touch, but with a firm hold. It came from all her years as a masseuse. Now I could see why she was successful in her solo practice and had loyal clients.

If that wasn't pleasurable enough, mom bent forward and effortlessly took my cock inside of her mouth. There seemed to be no hesitation as she tasted her own daughter. In fact, mom even swirled her tongue around my cock head, swooping up much of Lily's cum in the process. Mom then put her tongue back inside her mouth and gulped it down. I wondered if my mother was turned on by this.

That's when she really went to work. Mom's lips wrapped tightly around my cock with a vacuum-like suction. It was totally air tight and she bobbed her head while sucking, taking my cock deeper each time her head bobbed. The deeper she went, the more she tasted the fluids from Lily's pussy.

I wondered how mom felt about this; the fact that she was both sucking my cock AND tasting Lily's fluids at the same time. I got a firm answer by hearing her moan while she continued. Her eyes briefly closed and it seemed like she was enjoying this sexual moment a little too much.

What a great mother. An ideal mother, frankly. She was doing this for Lily. And she was doing this for me too! The truth was, I had no problem helping Lily out and keeping her warm during training. Heck, just those few minutes of fucking her was payment enough, even though I didn't get to cum.

Now I was being 'thanked' in the best possible way imaginable, with the payment being my mother's proficient mouth. Not only was she an expert in making people feel good with her hands, but she was also an expert with her mouth as well. Her head bobbed at just the right slow speed, a tight suction, and her tongue would give the occasional swirl. It seemed like she had no problem whatsoever with sucking my cock, and tasting Lily's squirt at the same time.

And that was fucking hot!

"Oh, shit," I moaned. "I'm going to cum."

That was when mom used her hands. The same hands that provided her with a steady stream of income from giving massages. Now they were wrapped around my cock, stroking me firmly with expert precision. Her eyes looked up at me as she sucked the tip of my cock and stroked my shaft.

Mom didn't flinch as I shot loads of cum into her mouth, one shot after the other, onto her tongue. The discipline this woman had. It was amazing. And it felt unbelievable. She was cerebral in the way she kept working her hands and mouth. Her facial expressions were unwavering as our eyes remained locked.

When I finished my orgasm and my cock started to soften, mom removed her hands and just sucked on my tip, until all the cum was in her mouth.

She gulped hard. I breathed a huge sigh of relief from the pleasure.

"You taste good," she said, licking her lips clean. "Just like Lily does."

"Have you tasted Lily before?"

Mom nodded. "I've licked my fingers clean after massaging her vagina. She didn't see that, though. I did it when she wasn't looking."

Suddenly, we heard footsteps entering the bedroom. There was Lily, holding a towel over her breasts, and her body and hair were still wet from the bath. There was a surprised look from watching mom down on her knees with traces of cum still around her lips.

"You think I taste good?" Lily asked our mother. "I'm glad, because there's going to be plenty more. Training is expected to increase these next few weeks and I'm going to need help from both of you. We might as well get comfortable with this."

Lily was dead serious, then tossed her towel away, standing naked in the bedroom. I looked down at my mother, who was utterly shocked by this. We both had the same reaction to Lily's demand.

***

I rode with Lily the next day, with my body pressed against hers from behind. She was fearless as she rode. This time she went faster and did more jumps. Higher jumps too. As usual, she wore a thin outfit so she'd have mobility with her arms. Part of my responsibility was giving her body heat, and to give her a safe feeling that I'd protect her from falling.

And of course, I was still tasked with helping to control Lily's condition the best I could. The worst parts came when she did the jumps. The jumping act itself gave her a powerful sensation between the legs. But it was the landings which really did it for her, with the saddle grinding hard against her pussy. It would cause her to moan and groan loudly, almost to the point of yelling.

The poor girl. She had a quick solution though, undoing the button and zipper of her pants as the horse came to a stand-still.

"Slip your fingers inside," she said, with her hands back on the reins. "I can't concentrate if I'm this horny, so take care of it for me, will you?"

The answer was obvious. "Of course, focus on your training."

I plunged my hand down her pants, an act I never thought I'd do, and rubbed her clitoris in a circular motion with two fingers. It seemed to work, giving her body heat and the ability to control her powerful sexual urges during the training session.

She came hard after doing a long jump, with her pussy grinding against the saddle and my fingers working her clit. Even though she came, I kept doing it anyway since I enjoyed playing with her pussy so much. Plus, I reminded myself, this was keeping her warm!

Even more enjoyable, mom had come home from a session with a client. She parked her car in the driveway and walked over to the track to watch Lily ride. There was a pleased expression on mom's face, seeing her kids bonding together and having fun, even though my hand was still beneath Lily's panties.

Mom leaned against the fence as Lily rode faster and did more jumps. It was her way of monitoring her daughter's health, who was pursuing a passion, and just having a good time.

I stopped rubbing Lily's clitoris, because I figured she had enough for the time being. But I did continue rubbing her stomach and crotch because her skin felt so nice, (plus body heat, remember?).

Lily waved at mom to come meet us in the barn. Apparently so we could have a quick hangout. Plus Lily was a big show-off and loved talking about how great she looked on the track.

When Lily and I got to the barn, we both hopped off and I tied the horse. Suddenly, Lily was hunched over and she put her hands on her thighs.

"Oh shit," she gasped for air. "My pussy."

I touched her shoulder, concerned for her. "What's wrong?! Do you want me to call an ambulance?"

"No, not that."

Lily undid her pants, sliding everything down to her ankles, her wet pussy and butt fully exposed. Then she bent over and leaned against the wooden structure. At this point, she didn't need to speak. What she wanted was obvious.

I undid my own pants to reveal my cock, which was already hard, and positioned myself behind her. I fucked her hard and fast. The barn filled with all sorts of lewd noises from siblings fucking; her pussy making wet sloppy sounds from the pounding, and Lily screeching and moaning.

While we were in the midst of a hot and heavy fuck session, mom had finally made her way over, casually strolling over to us, so she could watch us having sex. It was super awkward, sure, but there was a slight smile on mom's face. This was entertaining to her in some way, but I had a job to do, which was making my sister cum as hard as possible.

It was easy to make Lily cum after a training session because she was already hot and orgasmic. Her whole body tensed and squirted like a geyser, just like the day before. And when she came, her pussy was already spent.

"Oh fuck," she cried. "Stop!! Pull out!! My pussy hurts!!"

So I pulled out, once again, with my hard cock still raging, drenched with Lily's pussy juice, as Lily sat her bare-ass on the ground to recover. God, my cock ached. With Lily breathing hard and her body out-of-action, she would never bother taking care of my needs. So I looked intensely at mom.

"Me?" mom asked.

I nodded. "Remember our deal?"

Mom gave me that 'I guess a deal is a deal' kind of look and approached me. She got on her knees, still dressed in her work clothes, with a large coat over it, and began sucking my wet cock in front of Lily. She upheld her end of the bargain and sucked with a ferocity, gleefully sucking up all of Lily's fresh squirt in the process.

Mom sucked with a vigorous passion, and in between, she'd note how much she loved sucking my cock, and how much she enjoyed tasting Lily's cum. The sight of mom sucking cock was insanely pleasurable to both me and Lily. In fact, as mom sucked, Lily began to masturbate, even after all the orgasms she just had.

"Haven't you had enough?" I asked Lily, who was still masturbating on the ground as she watched mom sucking my cock.

She gave a devilish smile, "I'll let the doctor decide when I've had enough. And you're no doctor."

"Your sister is right," mom added, plopping my cock out of her mouth to speak. "Neither of us are doctors. The only doctor we've spoken with has said that the condition is harmless. So, we shouldn't feel ashamed for our actions."

With that, mom went back to sucking my cock with enthusiasm until I came. She sucked and slurped everything clean. Not a single drop wasted. In case she missed any, she kept her lips wrapped around my flaccid penis and sucked until nothing was left.

Mom smiled at Lily, while still holding my cock. "You better get 1st place. Your brother and I have sacrificed a lot for you."

Lily agreed, "We've all worked hard. And both of you have already been rewarded, right?"

She gestured to the wetness leaking from her pussy, and she was right. Mom and I had been rewarded with that magnificent pussy of hers. One that was relentless, intoxicating, and tasted like an angel's. In fact, mom seemed to be the largest beneficiary of tasting Lily's pussy.

There were times when I'd find mom giving Lily a warm bath, slipping her hand between her daughter's legs. Other times I found them naked in bed together, with mom's face buried in between Lily's cunt. Lily returned the favor, of course. In any case, the competition didn't seem to matter anymore. We were already winners in our own special way.

The End