Family Road Trip

a few years ago my parents decided to take all their children on a cross country road trip to visit all our relatives. I was 19 and a freshman in college at the time so I had been away for the past year. My older sister Karen was 23 and was also attending school. This left only my younger sister Sarah at home. Sarah was 18 and was a senior in high school. She had two weeks off for spring break which was when the trip was going to be. I didn't have any classes that semester but had elected to stay at school anyway. Since I wasn't really doing anything anyway I decided to fly home a week early. My Mom picked me up at the airport and after a lot of hugs and kisses she drove us back to the house where I went to unpack in my old room. After I finished unpacking I went to the living room where I lay down on the sofa and watched cartoons. It didn't take long for me to fall asleep.

I woke up about three thirty in the afternoon to the sound of the front door being closed rather loudly. A few seconds later my little sister Sarah walked in only looking at her I realized that she wasn't so little anymore. In the year that I had been away she had developed very nicely. As I looked her over I saw that she had grown a few inches taller she must have been 5'6 or so and, she had long sexy legs which I followed all the way up to her short black miniskirt past her curvy swaying hips and up to her flat sexy stomach which was clearly visible since she had tied her shirt up in a knot just above her belly button. Then I saw the shirt itself it was a small white t-shirt that she had been pulled very tightly across her chest when she tied it up. It was tight enough for me to see her firm perky nipples protruding out so that it seemed they would burst through her top any second. I would have loved to stare at her all day but just then she saw me laying there and her face broke out into a huge smile. She ran over and swung her leg over me putting a knee on each side of me so that she was kneeling on the couch as well as straddling my chest. Then she leaned forward hugging me as I sat up to meet her embrace. I smiled as we hugged and her shoulder length blonde hair fell around my face. 

"I didn't know you were coming so soon!" she said happily.

"Well I would have come a lot sooner if I had known I was gonna get a greeting like this." I told her smiling up at her beautiful face.

She looked down and to my dismay she climbed off me. I sat up making room for her on the couch. She plopped down next to me and gave me another long hug. Smiling I hugged her back smelling her smooth straight hair as I did. I could feel her tits pushing against my chest and it was starting to turn me on. When she finally did let go I had to shift my position a bit to hide my growing hard on from her. We sat on the couch catching up and talking about the coming trip for a few minutes and then she had to go do some homework. As soon as she had gone to her room I hurried to the bathroom put the lid down on the toilet sat down and dropped my pants. By now I was rock hard and in serious need of release but before I had a chance to do anything else there was a knock on the bathroom door. I quickly stood up flushed the toilet and pulled my pants back on. I flipped the sink on for a second and then opened the door. Sarah was standing there bouncing up and down. I had barely opened the door before she rushed in pushed me out and slammed the door closed. As I walked away I heard her sigh loudly as she started to pee. I quickly went to my room and closed the door behind me. I dropped my pants and lay down on my bed. I wrapped my hand around my throbbing hard on shuddering a bit as a wave of pleasure swept through me. I started to pump my hand up and down as my breathing became heavier. I held in a moan as I shot my load into the air. I kept pumping as streams of cum landed all over my shirt. After taking off my cum soaked shirt I lay back down and went to sleep. The rest of the week passed uneventfully. 

The day before the trip my older sister Karen flew in and I volunteered to pick her up at the airport. I was waiting at the gate as the passengers started to file out. After about five minutes Karen walked out. She was wearing a loose blue button up blouse and a pair of baggy jeans which I assumed was so she would be comfortable on the flight. She quickly spotted me and her face burst into a huge smile which was framed perfectly by her wavy brown hair. She came running over and gave me a big hug pressing her tits firmly against my chest as she wrapped both arms around me. The hug lasted only a minute or so but it felt like much longer to me.

"How are you?" She asked enthusiastically.

"Fine I can't complain." I told her.

"How is everyone else?" She asked.

"Well Mom and Dad have been busy with work and preparations for this trip and Sarah ...well she is good I guess." I answer laughing a bit.

"Good. Well shall we go and get my bags little bro?" she asked putting her arm around my waist.

I put my arm across her shoulders and we went to pick up her luggage. After getting all her luggage and loading it into the car we decided to stop for lunch before heading home. Since we didn't feel like stopping for too long we decided to drive through a burger place. Karen volunteered to drive and since I had driven to the airport I happily agreed to let her drive home. We headed out and quickly found a place to drive through. We placed our order and drove around to the window to pick up our food. First the guy at the window handed us a bag with our food then he proceeded to hand over the drinks but, his hand slipped and he accidentally spilled a coke all over Karen. I tried not to laugh to much as the manager came to the window and after getting us a new drink and apologizing several times let us have our food free of charge.

"You think this is pretty funny don't you Jeremy?" Karen asked me as she smiled.

"Just a bit." I say smiling back at her.

"Well I am freezing now." She said "Would you mind helping me out here?"

"What am I supposed to do?" I asked laughing a bit as I said it.

"Take this wet shirt off me for starters" She answered as she pulled onto the highway.

"What!" I said incredulously.

"Oh don't be silly Jeremy we are siblings and besides I'm sure you've seen a girl without a shirt before." She said confidently

"Are you sure you don't just want to stop someplace and change?" I asked.

"It would take to long and I am eager to get home. So stop being shy and take my shirt off my nipples are freezing." She replied.

"Ok fine." I said reluctantly.

I leaned over and started to unbutton her coke drenched blouse. As much as I tired not to I couldn't keep my hands from brushing up against her bra as I worked my way down. I could feel my cock starting to grow as I looked at my older sisters red lace bra covered in coke with her nipples hard and pointed from the cold liquid visibly standing out through the material. I tried to think of something else before I got to excited but I couldn't help but stare as I finished with the last button. Karen leaned forward so that I could slip the shirt off her shoulders. Then I helped her remove first one arm then the other. I wadded up the shirt and tossed it in the back.

"Can you get the bra too?" She asked. "Before my breasts get any stickier than they already are"

"Umm... sure I guess" I said while I tried to shift in my seat to hide my erection.

I noticed then that she was wearing a front clasp bra. My cock jumped a bit as I started to unclasp the bra my hands were rubbing against her breasts. She gave an involuntary shudder as I removed her bra and the stickiness of the coke peeled off her hardened nipples. Her tits were beautiful especially since her nipples were hard and red from me peeling her sticky bra off of her.

"Ohhh that is much better" she said blushing a bit at her reactions.

"Glad I could help" I told her as I tried not to stare at her bare breasts.

"Thanks" She says looking over at me and smiling.

When she looked over I noticed her eyes dart down to my crotch and then she quickly looked back at the road blushing a bit but, surprisingly she didn't say anything. At least she didn't say anything for a minute or two and, when she did say something it wasn't at all what I expected.

She said "My pants are soaked too and my ass is getting cold."

"Do you want me to take them off for you too?" I said trying not to sound too hopeful.

"If you don't mind." She said glancing over at me and smiling.

"Not at all" I said smiling back at her.

I reached over and undid the button on her jeans and then pulled the zipper down. Next I pulled her jeans open revealing dark red panties to match her bra. She lifted her ass up and I slid the jeans down revealing her gorgeous ass. I let my hands brush up against her ass as I continued to pull her pants down further. I carefully slid them first over one foot then the other. Now my sister was sitting next to me driving down the highway in nothing but her panties. I was making no attempt to hide my erection now and she was making no attempt to hide the fact that she was stealing glances at it as often as the road allowed.

"These panties are all sticky too" She said in an innocent little voice.

"Well we had better take them off too" I said as I gave my cock a quick rub.

Seeing me rubbing my cock she started blushing again. I stopped rubbing myself and leaned over to take off her panties. As I started to slip her panties down her legs my face was very close to her naked breasts. As I finished taking off her panties I couldn't resist any longer and I started to suck on her left tit flicking her hard nipple with my tongue and sucking on it hard. She started to moan and instead of stopping me like I'd thought she would she arched her back pushing her tit further into my mouth. As I continued to mouth my sister's nipple she started to swerve back and forth in her lane. Someone started to honk at her and I quickly released my vice grip on her nipple giving it on last bite. When I sat back up I noticed a large truck driving to our left with several teenage guys crowding the windows staring at my sister. I suddenly realized that it was them who had been honking and, not because we had been swerving all over the road but because they wanted to get our attention. Karen looked over at me blushing and, I started to blush too as the reality of what we had been doing started to sink in. I didn't exactly feel bad but, I did feel a little awkward. I suspect that Karen felt the same since she didn't ask for any clothes but she didn't try to draw me back to her body either. We drove the rest of the way home ignoring the few drivers that noticed Karen was naked. Luckily no one was home when we arrived. I unloaded Karen's bags while she went inside. After I had finished unloading the bags I went to the living room and sat on the couch to watch some television. A few minutes later Karen walked in and to my surprise she was still naked.

"Couldn't find any clothes?" I asked half jokingly.

She gave me a little smile and then paused for a few seconds as she seemed to consider something. Apparently she made up her mind because she walked over and sat on the couch with me.

"I was thinking." She said quietly. "Since you got to see me naked..."

She let it hang out in the open waiting for my response. 

"You want to see me naked?" I asked curiously.

"Yeah why not I mean after all you have seen me." She answered.

"Ok I guess that is fair." I told her "But if I recall I had to undress you."

"You know your right." She said smiling at me seductively.

I sat up straight raising my arms as she reached over and lifted my shirt over my head. Next she unbuttoned my pants undid the zipper and pulled them off me. Now the only thing separating her from my huge hard on was my boxers. She looked at my dick poking up through my boxers for a while then she yanked them down revealing my hard cock standing straight up. She was positively beaming as she cuddled up next to me on the couch holding my arm and laying her head on my shoulder. We sat there cuddling and naked and watched TV for a while. Then she reached down and started stroking my dick up and down with her fingers but, she never took her eyes off the TV. Precum started to build up on the top of my dick as she traced intricate patterns on it with her fingernails. Finally after torturing me with anticipation she wrapped her hand around my shaft and started to jerk me off. I started to moan as she increased her speed. We were both still acting like we were watching the television as my breathing became heavier and her strokes became faster. She started to twist her hand around my cock as she pumped up and down while her free hand had found its way to my balls. I knew I wouldn't last much longer and, apparently so did she because she aimed my cock straight at her face and started to pump furiously. It didn't take long before I started shooting loads of cum onto my sexy sister's naked body. The first stream hit her neck the next hit her right in the mouth. She got hit several more times in the face covering her eyes and cheeks and , as my orgasm wound down I shot quite a few loads onto her hard stiff tits. She smiled at me squinting because of the cum all over her eyes and licked her lips getting a large taste of my cum. Right then I knew that I was really going to enjoy this family road trip...

it was early. Far too early for me to be up but, here I was lying awake in bed. I had woken up during a rather intense dream and just didn't feel much like going back to sleep. Instead I started recalling the events of the previous day. I closed my eyes and watched again as that fateful cup of soda splashed all over my sisters chest. I noticed how quickly her nipples got hard once the cold drink engulfed them in its sticky embrace. The fabric of her blue shirt pushed out by the hard sexy nipples trying to make their way to freedom. Reliving the experience of slowly and playfully stripping the clothes off my sister I watch her face as she tries to discreetly steal glances at the tent in my pants. 

My tongue flicks over my lips involuntarily as I recall the taste of her sweet soda coated nipple. The feel of it in my mouth is amazing. Suddenly my thoughts jump ahead to later on that day. I am back on the sofa with Karen's face glued to the TV and her hand stroking my dick. I watch eagerly as she finally turns from the TV and puts her face right in the path of my cum as I shoot stream after stream onto her smiling face and her perfect tits. 

"Ahhhh" I let out a contented sigh as my recollection of the days events comes to an end. It's too bad Mom and Dad came home before we could do anything more I thought to myself. Right after I had cum we had heard the car pull up and Karen quickly ran off to take a shower while I pulled my clothes back on as fast as I could. The rest of the night had been fairly normal. The only thing new was the way Karen and I looked at each other across the dinner table. We both knew we wanted more but, we also knew we would have to wait. So we had both turned in early for the night. Probably hoping that sleep would bring the following day faster so that we might have more fun together. Although I had to admit it was going to be difficult to do anything more with her today. Especially since everything was already packed up and loaded in the car ready to go. Dad is going to want to leave as soon as breakfast is over so that we can make it to our first stop sooner.

Sure enough things went exactly as I predicted. We all got up absurdly early, ate breakfast, and then headed out to start our journey. Walking out to the drive way I watched both my sisters walking arm in arm in front of me and I couldn't help but admire how beautiful they were. We made it to the car far to quickly and I reluctantly tore my eyes away from the swaying asses in front of me. What I saw when I looked at the car though made me burst into a huge smile. Dad had loaded all of our luggage into the middle seat of the big SUV. Which meant that all three of us kids would have to sit in the back seat and, the luggage was piled so high that we would be almost completely invisible to our parents up front.. 

I couldn't help but think that the odds of having more fun in the car with Karen had just shot up astronomically! Of course Sarah would still be back there but she would probably sleep at some point and we could always cover up with a blanket if we needed to. 

"Honey, I honestly don't know why you packed it this way. We won't be able to see the kids at all." Mom was saying as she looked disapprovingly at her husband.

"I've told you already." He answered back "It helps us get better fuel economy"

My mother's frown deepened as she and my Dad climbed into the front seats still arguing the finer points of loading a car. This left me, Karen, and Sarah to pile into the backseat. Karen climbed in first and, I followed close behind feigning a slip so that I had an excuse to give her ass a quick grab. Once we finally got in our seats she gave me a playfully amused look until Sarah hopped in after me and pulled the door shut. Looking up at the front I couldn't even see my parents over the stack of suitcases and duffel bags piled in the seat in front of us. Looking back I saw that a pile of pillows and several blankets had been thrown in the rear of the vehicle in case anyone got tired. Although I was already thinking up much more naughty uses for them.

"Everybody ready?" Dad called back cheerfully

"Yeah lets get going" I called back eager to get started myself.

As the car started to move I leaned back into my seat and stretched my legs out amazed at how much room the back seat provided even with three people seated there. It wasn't long before Sarah informed us that she was still tired and wanted to lay down. I pulled a pillow out of the back for her. Putting her pillow against the window she spun sideways to face me and slid down the seat. As she slid down the seat her shirt was getting stuck on the leather causing it to slowly slide up farther and farther from the yellow skin tight boy shorts she had squeezed herself into for the trip . The closer she slid to me the further up her shirt went and, since she already had her eyes closed I was free to stare unrestrained as inch after inch of her beautiful skin was revealed to my hungry eyes. She let her ass bump into me before she stopped leaving her entire mid section exposed all the way up to where her shirt bunched up at the bottom of her breasts. She positioned her legs across me so that one leg was on either side of my massive hard on and her feet were almost in Karen's lap. Luckily she hadn't put a leg down on my throbbing cock which was straining uncomfortably at the fabric of the pajama pants I was wearing. 

A dark stain of precum was already visible where the tip of my cock pressed firmly against my pants a mere inch or two from the bare sexy leg of my little baby sister. I was trying to decide how best to reposition to avoid any problems when a light touch on my shoulder reminded me that Karen was still sitting right there next to me. I found myself wondering if she had been watching Sarah's inadvertent strip tease too. I turned to face her and was met with something unexpected. A kiss but, not a quick playful little peck a very forceful and very passionate kiss. Her lips pressed against my own and her tongue quickly forced my lips apart leaving me momentarily stunned as her hand found mine and quickly pressed it against the luscious mound of her breast. She patiently squeezed my hand in hers helping me cop the first few feels of her magnificent tit. 

Finally my brain caught up with what was happening and I began to massage her breast on my own. My tongue leapt forward to battle with Karen's for control of the kiss. She let out a low moan of approval that I knew my parents wouldn't hear but, I worried Sarah might. Fortunately she already seemed to be asleep. The kiss was amazing and it lasted what seemed like hours but it was extremely frustrating not being able to pull Karen right up against me. Not getting to feel her body on mine. I wanted to feel her grind against me as our tongues dueled. I wanted to feel her firm naked tits harden against my bare chest as they were exposed to the cool air. I wanted all of these things and more but I couldn't have any of them. It would never work in the car and especially not with Sarah's legs draped over me. It was hard enough for us just to kiss without bumping into or brushing against our sister's lovely body.

Karen didn't seemed to worried about it though. She kissed eagerly, seemingly oblivious to her sisters feet resting just half and inch from her breast as she leaned over them during our steamy make out session. I decided if Karen could through caution to the wind then so could I. I temporarily released Karen's breast and slid my hand down her stomach . Then slipping my hand underneath Karen's shirt I slowly felt my way along the flat smooth skin of her midriff until I made it back up to her sensational chest. Taking her breast back in my hand I could feel the warmth of her skin and the rapid beating of her heart. I was glad she had decided to go braless today as it was making things much simpler. She never missed a beat as I tried to up the ante with my risky hand move. She just kept right on kissing me like we would never get to kiss again but , both of us knew we were not being careful enough. If Sarah were to wake up there would be no way for us to move apart quickly enough nor would there be a way to explain why I had my hand under Karen's shirt.

Of course Karen didn't seem to mind. In fact she seemed to enjoy making things more interesting. After a few minutes of my hand massaging under her shirt she slid her hands off of me to reach down and lift her shirt up over her head. I leaned back with a huge grin on my face as I watched her throw the shirt behind the seat to show me that she wasn't afraid to take some risks and add to the excitement. With a little wink she lifted her breasts up pushing them together at the same time causing my cock to jump a little in my pants. We both looked immediately over to Sarah's face but she was still fast asleep. Turning back to Karen I noticed her repositioning herself so that she was on all fours with her face right in front of mine. 

Karen's new position made it slightly awkward as we resumed kissing but, her intentions were quickly made clear. She slid one hand into my lap right between Sarah's legs and grabbed my cock through my pants. Giving it a few gentle squeezes Karen forced my head back into the seat kissing me more wildly than before as she slipped her hand through the slit in the front of my pajama pants. I couldn't help but shudder as her cold hand slipped around my warm cock and pulled it through the hole. Now we were really pushing it. Karen was topless and perched doggy style over my fully exposed and painfully erect penis which was quivering just inches from our young sleeping sisters long slender legs. I was nervous! I was terrified! I was thrilled and, no matter how worried I was about getting caught I didn't want it to stop. All of the risk just served to turn us both on more and more. I knew Karen felt the same because as I was sorting through my racing thoughts she had already lowered herself down to cock level. She broke me out of my pondering with a long slow lick up my dick from the base all the way to the tip where she greedily flicked a drop of precum up into her waiting mouth. 

"Ohh God you taste good!" Karen Purred sounding genuinely surprised. "I am gonna have to get some more of that." 

Leaning down she once again licked up my shaft only this time when she got to the top she quickly engulfed my cock in her mouth until I was pressing against the back of her throat. 

"Mmmm she moaned" softly sending vibrations coursing through my pulsing manhood. Ever so slowly she started to bob her head up and down on my shaft and, it was all I could do not to lift my hips up to meet her mouth in it's delicate work. She kept her tempo just slow enough to keep me from cumming but, just fast enough to keep me right on the edge. Her skill was undeniable as she put me through the most enjoyable kind of torture. 

"Karen you....you are amazing but please let me cum. I need it so bad." I begged 

"Hmm nnn" she said shaking her head no and, causing the head of my cock to swirl around the inside of her mouth. Just barely scraping her teeth. The movement and the extra contact were almost enough to put me over the edge but, her practiced tongue quickly adjusted the frequency of it's licks and, the timing of her mouths constant sliding on my dick slowed to the point where I was stuck waiting on the edge of release once again.

I found my gaze wandering over to Sarah whose legs were the only thing keeping me from grabbing onto Karen's head, shoving my cock down her throat, and filling her belly with my seed. Still even though she was keeping me from getting my sweet sweet release I wouldn't want her to move. Her presence was making things much more erotic. I was very aware of her legs on my lap. I could see her smooth skin come and go under strands of wavy brown hair with each bob of Karen's head. Her bare stomach was completely exposed to me all the way up to the base of her breasts. Her face was peaceful as she slumbered innocently next to us. Her big sister giving the most amazing incestuous blow job right between Sarah's legs. 

It was then that I had a deliciously wicked Idea. Reaching over with my right hand I lightly gripped the bottom of Sarah's shirt just below her right breast. Being very careful not to move to fast I deftly lifted her shirt up and over her tit. Surprisingly Sarah had decided to go braless today as well Glancing back at Karen I saw that even though she was still bobbing up and down on my dick her eyes were glued to the freshly exposed flesh of Sarah's young tit. Karen smiled up at me as best she could with a mouthful of cock and, then looked meaningfully towards Sarah's other breast. The one that was still covered...for now. I moved my hand to Sarah's shirt slightly more confident this second time around. I gently lifted it up and deposited it on the other side of Sarah's left breasts. 

"Mmm! Tose ook ummy!" Karen said as her lips were gliding down my glistening cock.

"They sure do look yummy!" I agreed slightly distracted by the aching of my balls and the throbbing of my over teased manhood. 

"I tell you what Karen. If I reach over and touch one of her tits will you let me cum?" I asked hopefully although I wasn't sure if I hoped she'd say yes or if I wanted her to say no. It was a crazy thing to even suggest but I was desperate by now. I could see Karen thinking it over in her head as she continued her mouth continued performing it's task with a level of expertise I had never before experienced. 

I could tell the idea was turning her on. Her eyes blazed with lust but, still she took her time answering. Whether she was really thinking about it or she just didn't want to give up sucking on my cock just yet I'm not sure. Eventually though she gave me a wink and said

"I will get you off if you play with them."

That was a bit more than I felt safe doing but my brain was not strong enough to over rule my dick at this point. So before I knew it I had my hand placed on one of Sarah's lovely tits. The smooth pale skin of her breast felt good in my hand. The breast itself was nice and firm not sagging in the least. Not surprising since she Sarah was barely eighteen and her breasts were large but not excessively so. Her nipples were long and pointed straight out just begging to be played with and so I took one between my finger and my thumb and began to play with it gently at first but, found myself growing bolder as Karen began to increase the speed of her sucking. Sarah opened her mouth slightly letting out a deep breath but she didn't wake up. I could feel Karen pushing herself further and further down with each stroke until finally she was taking eight of my ten inches down her throat. It didn't take but a few more deep gulps like that before I started shooting stream after stream of cum down Karen's hungry throat. 

I could feel her purring with satisfaction as she slid up some to let me fill her mouth with my apparently delicious juices. Finally the last few drops oozed out into her overflowing mouth and I let out a great sigh of relief. My cock exhausted by the marathon blow job quickly wilted back into my pants. Karen had cum running down her chin and she proudly opened her mouth to show me the massive load I'd left inside.

"Mmm you gonna swallow it for me sis?" I asked hopefully

Karen shook her head no to my disappointment but, then she did something I would never have expected. She crawled over me positioning herself directly above Sarah. Leaning down Karen placed her lips about three inches above Sarah's and then slowly let all of the cum slide out of her mouth. It slowly oozed down into Sarah's sleeping mouth some of it landing on her lips. Surprisingly Sarah hardly stirred at all and after Karen had let the cum all fall out Sarah gulped and swallowed reflexively her body reacting to the cum even while she slept on unaware. Slowly Karen leaned closer giving Sarah a gentle kiss on the lips and licking up the stray cum from her chin. The she reluctantly moved away carefully sliding Sarah's shirt back over her breast before shifting back across me and into her own seat once more. 

I looked at her smiling. My cock was hard again and poking once again at my pants.

"That was the hottest thing I have ever seen!" I whispered excitedly

She smiled back "What should we try next?" she asked playfully.

what should we try next?" Karen asked playfully. The question echoed playfully within my head unleashing a slew of deviant desires that I'd never before dreamt possible. Unfortunately before my racing mind could settle upon a properly perverse plan for what to do next I felt the car begin to slow as Dad pulled off the highway.

Karen silently slipped her tongue into my mouth for one more kiss before climbing over the seat into the pile of pillows and blankets in search of her formerly forsaken top. Shifting my gaze out the window I realized we were pulling into a highway rest area. Just as Dad eased into park, Karen maneuvered her now fully clothed body back over the seat and settled herself next to me. 

Unable to follow as Karen and my parents exited the car I remained stuck, contentedly, under Sarah's slender legs as she slumbered on. It still amazed me that she hadn't woken after all Karen and I had done to her enticingly lithe young body. My Curiosity about the matter was short lived though as Mom poked her head in the open door to say "Oh, Hun you can go ahead and climb out for a stretch. Sarah took a very strong sleeping pill before we left, and won't be up for hours". "Sarah takes sleeping pills...why didn't she say anything?" I asked, trying not to let my excitement show. 

"Well she is a little embarrassed that she needs them. You know how she can be. Don't tell her I told you, Ok? I just didn't want you to be stuck in there."

"Sure thing Mom I won't say anything to her" I replied as I slid myself out from under my sister's legs. 

Stepping out of the car I lifted my arms overhead to stretch out my muscles. Unable to stifle a yawn after my long stretch I set out in search of the restroom with my mind tangling into knots contemplating all that had happened and all that still could. We spent ten minutes or so at the rest stop before Dad let everyone know it was time to pile back into the SUV. Heading towards the exciting possibilities of the car I found myself walking behind Mom and Karen whose conversation I couldn't help but overhear. 

"Karen sweetie would you mind riding up front and navigating for your father so that I can nap for a bit?" Mom asked using her sweetest Mom voice. Doing her best to contain her disappointment at being denied more back seat merriment Karen reluctantly agreed to the seat swap. Fairly disappointed myself I sped up to pass them and climbed in ahead of my cock blocking mother, and slid myself back under Sarah's waiting legs. Mom hopped in after me smiling at how cure she found Sarah sprawled out over my lap. If she only knew that right then her sleeping daughter's exposed belly was full of my cum. Cum delivered by her other daughter's talented mouth. My face split into a huge grin at the filthiness of it all.

Five minutes down the highway my hopes were rekindled when Mom decided she'd sleep better lying down and quickly disappeared into a cocoon of blankets behind the seat. Finding myself in a semi-private situation with my little sister, who seemingly would sleep through anything, I began to form a plan. Eager as I was a few minutes of patience to allow Mom to drift off ensured no intrusions for the foreseeable future. Mom's soft snoring was all the incentive I needed to set my plan in motion. Slowly, I reached over to once again raise Sarah's top over her bare breasts. Her perfect tits begged my touch and teased my imagination. Restraining my urges, for now, I grasped each side of her tight yellow shorts and gently slid them down to her knees. My eyes feasted on a well trimmed tuft of blonde hair and a deliciously tight little snatch. My cock was throbbing and my pants were again being soaked with precum. Wasting no time I slipped out of my pants freeing my cock. Luckily Sarah's pillow against her window blocked any easy view from passing cars. Sliding further over with my cock poking up between her legs I squeezed my aching hard on in between her thighs and right up against her exposed pussy. It was tricky with her shorts around her knees, but finally the base of my cock was slightly parting her pussy lips as the head stood eagerly oozing precum high over her cute blonde pubes. Everything was ready for the next part of my plan. I grabbed my phone held it to the side of my cock angled towards Sarah's face and snapped a pic.

Checking out my own handiwork I had to admit the picture came out perfect since it was taken from near her feet and at just enough of an angle that everything from her tits to her pubes brushing my cock was clearly visible. Smirking at my own deviousness I opened a new text to Karen, wrote 'Miss ya back here', attached the pic, and hit send. It didn't take long for Karen to reply. Her text read 'OMG! That is so fucking Hott! If she wakes up she will freak!' 

Knowing that her heavy duty sleeping pill meant she wouldn't be likely to wake I decided to push things further. Reaching back careful not to wake Mom I grabbed another pillow to block the other side window then got to work. First her shorts then her top slipped effortlessly off leaving my little sister, who apparently didn't believe in underwear lying completely naked with my hard cock between her slender toned legs. Lifting her hand from between her side and the seat I positioned her fingers around my cock, and was about to take another picture when a better idea surfaced. Switching my phone to video and hitting record I started to lower and raise my hips. If her sleeping face hadn't been in the frame it would have looked like she was jacking me off with her thighs and hand. After ten seconds I ended the recording, attached it to a text, and wrote 'what's the matter...scared? Didn't seem to worried when spit a load of my cum down her sleeping throat sis ;) '

Waiting for Karen's reply it was obvious that even deep in a pill induced slumber Sarah's body was responding to my attention. The side of my ten inch cock was coated with her warm juices and even with my movements halted her sweet nectar continued to flow against my manhood and down onto my lap and balls. Reveling in Sarah's unwitting arousal I almost jumped when my phone buzzed its announcement of Karen's response.

K 'You are so bad! I am so wet for you...put it between her tits for me : ) '

Having anticipated Karen making a request my response was already ready.

J 'Only after you flash me'

K 'WTF how am I suppose to do that? Dad is right there!"

Again I already knew what to say I wrote 'You'll figure something out :p' , snapped a pic of Sarah after putting her top back on, attached it, and fired off my ultimatum. 'Karen shot back 'No! Don't dress her....ok ok I'll do it. Just give me a minute.'

It took a whole ten minutes but finally a pic arrived and I couldn't help smiling. Karen had fully unfolded a road map and used it to hide her luscious tits fully exposed to the camera as she stuck her tongue out at me. My hard on twitched happily against my younger sister's pussy which responded with a renewed deluge of her already abundant essence. Karen obviously thought I'd been counting on her backing down so I wouldn't have to go further with Sarah. Unlike me she didn't have a clue about the sleeping pills. That knowledge gave me a distinct edge in this game of tit for tat an edge which I would push as far possible. So without any hesitation I stripped Sarah's top back off, slid out from under and between her legs, and straddled her waist. The feeling of lowering my dick between those big perky tits while recording it for Karen was amazing. I couldn't resist squeezing them together and pumping my long hard dick between them. Stopping after a few seconds of titty fucking my sister I zoomed in on the glob of precum my cock had left on her chin, ended the recording, attached it to a text, wrote 'Too bad you won't get to see me explode on her face sis :p' and hit send. Karen replied

K 'Please! Jeremy you have to show me : ( '

J 'IDK...I've already shown you a lot. What can you show me in return?'

K 'Dad is right here and I can't use the map again...'

J 'Oh well, I'll just go ahead and finish without showing you : ('

K 'WAIT! What do you want me to do?'

J 'What are you willing to do?'

K 'Anything but don't get me caught by Dad'

J 'I can't control if you let Dad catch you so no deal.'

K 'Fine just tell me what you want...I'll do anything'

J 'I want a pic of you licking your nipple'

K 'If I do then you will cum on Sarah's face and video it for me right?'

J 'One pic won't earn you that but it will be a start'

K 'No fair! It's way harder for me up here.'

J 'You said you'd do anything...better hurry if Mom or Sarah wake then you'll lose your chance.'

K 'You are making me so horny! Fine I'll do it."

Surprisingly it only took Karen a couple of minutes to pull it off. The pic showed her shirt pulled up over her tits with one lifted up to allow her long tongue access to her hard round nipple. In the background was Dad with his head turned away as he checked the next lane over before switching into it. My balls were throbbing. I couldn't believe how brazen she had been. She was obviously turned on enough to be pushed further. 

J 'Ok sis now I want a video of you fingering yourself'

K 'Ok, let me figure out how and I will.'

After several minutes of waiting I could no longer sit there unmoving with my cock between my little sister's tits. Starting my phone's video recorder for when Karen earned it I began to slowly slide my cock between Sarah's tits which immediately began to perk up. Her nipples hardened under my thumbs playful circling as I squeezed her firm mounds around my cock, still slick from her excessive wetness earlier on. The sensations I was feeling titty fucking Sarah were intense and my speed increased rapidly as I felt myself drawing ever closer to inevitable release. Making sure to keep the camera aimed true I began to whisper to Karen "When you watch this Karen I want you to know I am doing this for you". With that I could hold back no longer. My balls tingled and tightened and a deep moan escaped my lips as I blasted the largest load I'd ever shot all over my sleeping sister's face. The first few streams launched so far that massive globs coated her lovely blonde hair leaving long thick trails down across her forehead. The second set covered her from eyes to chin so much so that I wondered if she could breathe, but still more erupted drenching her face even more completely. When my orgasm finally subsided I had no idea how long it had lasted or how loud I'd been and Sarah was sucking in mouthfuls of my cum just to breathe. I watched as huge puddles disappeared into her sleeping mouth. Panic started to set in as I worried that this might be too much and she would wake or that my Mom would wake from her nap to a situation I'd have no way of explaining. Quickly shutting off the recorder I used a pillow case to clean Sarah up as best I could stashing it under the seat after. I knew she'd wake up with sticky hair and a salty taste in her mouth, but she would have no idea why and for some reason that turned me on again. I couldn't help but get hard again as I went about dressing her and myself. 

Once everything was back in order I plugged my headphones into the phone and hit play on the video I'd just made. Watching my handiwork was incredibly arousing and just as I feared I'd grunted and groaned loudly when I lost myself in my orgasm. Lucky for me Mom hadn't woken and now that the risk was past I knew my loudness would only serve to turn Karen on even more when she watched an insane amount of cum engulf our little sisters innocent face. Since I still hadn't received a video from Karen I decided to rest my eyes. Almost instantly I was asleep, and the next thing I knew Dad was waking me up with a firm shake of my shoulder saying "Jeremy come on get up we are grabbing a bite to eat so you might want to change out of your sleep pants". 

Awareness slowly crept into my mind and I found that everyone else was already gone. Digging into the luggage I slipped out of my pajama pants and into a pair of basketball shorts not bothering with boxers. Sliding out of the car I took a moment to adjust to the brightness then headed into the cheap diner Dad had chosen for lunch. Before I even made it to the table I could see Karen glaring at me over her menu so I promptly took a detour to the men's room to check my phone. Not only had Karen sent me a video she had also followed it with a string of inquisitive and then angry messages about my silence. Opening the video attachment I popped in my headphones and after making sure the door was locked hit play. The video started off with Karen and Dad chatting about when and where to stop for lunch. Pouncing on the opportunity Karen casually mentioned she wanted to change if they would be getting out for lunch and asked if Dad would cover his right side view so she could do so. Reluctantly Dad agreed telling her to hurry so he wouldn't wreck. After fishing out some clothes Karen got a shot of Dad driving with one hand on the side of his face blocking his view. She then used her free hand to slip out of her bottoms and then her top. This left her entirely naked next to Dad who she panned over to show was still covering his peripheral vision. Focusing back on her naked body Karen silently spread her legs and slowly dipped two fingers inside her obviously wet snatch. Her fingers slid in and out reaching deeper with each slow thrust but after only a few seconds the show ended and Karen slid herself into a blue sundress, again with no under garments, then sucked her fingers clean for the camera and ending the recording with a wink. 

Now I understood why she looked so mad. She had gone all out for me and assumed that since I'd fallen asleep she wouldn't be getting her promised reward. Once she saw what I'd done for her I knew she would forgive me. All that I had to do was decide when and how to show her.