Author's Note: Stories on this site may contain fiction of an adult nature. They may contain themes involving Incest, under age sex, rape, bestiality, drugs or alcohol abuse. If these subjects make you uncomfortable please exit now. The stories are meant for the entertainment of adults as defined by your local government or society, if you are below this age please exit now. The author does not condone or encourage anyone to act in real life the way the characters depicted in this story act.
Please help to support ASSTR by making a donation HERE

First Published: 18 May 2017

Cousin's Party
by Isabella

Story Code: m/f, Incest, Bro/Sis

I'm just an average fifteen year old boy, full of insecurities and hormones. I spend my life chasing every girl I meet, sniff around her, use all of my best lines and eventually get knocked back...well, perhaps not all girls, not my thirteen year old sister Sarah, but every one of her friends have knocked me back. Sarah even complained to my mother about me grossing all of her friends out with my constant attempts to get in their knickers.

Well, I got in a shit load of trouble for that, I was told to keep away from thirteen year old girls so I had to lift my sights, look for a willing fourteen year old for me to hone my skills on. I was on the edge of despair when I heard on the grapevine that my cousin Ron was having an eighteenth birthday party on Thursday evening...sorry, that's not quite right...he was having a party to celebrate turning eighteen even though he'd actually turned eighteen three months earlier but Thursday was the first time that his parents were both going to be away for the weekend and Cousin Ron was taking every opportunity to enjoy being eighteen.

I pestered my cousin for three days solid but he was adamant that I wouldn't be getting an invitation to his party. I was so desperate to get an invite that I had to play dirty, after I'd received my fiftieth rejection I walked away and threw a comment over my shoulder, "Oh well, I'll just have to mention to my father that you're having an unchaperoned party, I don't think he's got anything better to do on Thursday."

Ron knew that my father wouldn't be able to keep his nose out of his nephew's business, he would be determined to make sure that no one had fun at Ron's party if he knew that his brother and sister-in-law were away when their son was holding a party in their house and so I suddenly found my invitation was finally forthcoming from my cousin.

When the party started on Thursday I was the first guest to arrive, by ten o'clock I was still the youngest participant and although I'd sniffed around every girl there I was still unlucky, I was in the garden just after ten o'clock, watching two of Ron's friends making out with two girls and they were in no way modest or shy about what they were doing which did nothing to cure my frustrations. I suddenly spotted Phillipa and Justina, they were friends of my sister, Phillipa was thirteen and in the same class at school as Sarah, Justina was fourteen and had made the jump from middle school to upper school.

I was surprised to find that two of my sister's best friends were at a party of a boy who was so much older than them. I headed for the kitchen but was too late, two of the older guys had already moved in on Phillipa and Justina and were already into the first stages of sexual conquest.

It was more than apparent that both girls were well oiled before they turned up at the party and although the house was awash with alcohol I wasn't going mad, drinking carefully and pacing myself but the same couldn't be said of the two friends of my sister, between ten o'clock and ten forty-five I watched both girls being fed four large drinks of spirits as different boys took turns at snogging and touching the two girls up.

At ten forty-five I followed on as the girls were led on unsteady feet up towards the bedrooms upstairs. No one cared that I was following as four boys took Phillipa into one of the spare bedrooms and three boys took Justina into another. Justina was the older of the two so I followed her group, her body was far more developed than her sister's and she was soon naked, totally naked. The first girl I'd seen totally naked in my life, well, apart from Sarah but my mother stopped me seeing Sarah naked when she was about six and I was taking too much interest in the differences between us.

I sat there watching as the three boys took their turn on top of Justina, I was hoping that after all three of them had finished off in her cunt that they'd lose interest in her and leave the room to get more alcohol and if they did I was planning on jumping on her body and finally losing my virginity.

Ron walked past the open bedroom door just as the last of the boys was pulling his cock out of Justina's dripping wet fanny. I could clearly see spunk running from her body like a babbling brook and I was readying myself for my turn when Ron said, "You don't want her...you want one of her school mates, a girl that hasn't seen as much traffic as her..." and with that I was pulled from the spare bedroom and along the passageway to Ron's own bedroom.

Four of Ron's friends were holding a girl down on Ron's bed, they had pulled a sheet over her face and from the sound she was making they had gagged her as well, Ron whispered up close to my ear, "Don't say anything, as soon as we've all taken our turns at her we're going to dump her on her front doorstep and she'll have no idea how many of us have fucked her or who we are exactly, we're teaching her a lesson for gate crashing my party!"

I was a little uncertain but the girl was going to get fucked by someone so it might as well be me that fucked her. I didn't strip off; I just pulled my pecker out of my trousers and clambered up to her body from the foot of the bed. It took me an age to get my cock in her cunt, she was really wriggling and fighting me even though four burly eighteen year old boys were holding her down and once I managed to get lined up with my goal it was still no picnic, her hole was so tight that it was a fight just to bury my cock in her.

Once I got in my stride though I managed to get up quite a bit of speed and was soon gasping as I climaxed into her body. As soon as everyone was certain that I was shooting my spunk up into the girl, Rob moved in at the head of the bed and he pulled the sheet off of her face and his friends all let go of her arms and legs and as I grunted through to the end of my climax I got the shock of my life to find that I was actually fucking my own sister.

Okay, boys don't usually have any feelings of remorse after fucking a girl, even in such fucked-up circumstances but looking down at my sister's tear streaked face made me feel sick. I pulled out of her ravaged cunt and ran for the bathroom to be sick.

I guess that Cousin Ron was teaching me a lesson for forcing him to let me go to his party but I wondered why he'd chosen Sarah to suffer under me. After I straightened myself up in the bathroom I thought that I'd better face the music, Sarah had complained to our mother when I'd been sniffing around her friends, what the hell would she do now that I'd effectively raped her.

I went looking for Sarah, just outside Ron's bedroom door I heard Ron say, "I wonder if your brother's stopped running yet?"

I heard Sarah laugh, "My eyes are still stinging from that crap you squirted into them to make it look like I was crying, you'd better make it worth my while letting my stupid brother fuck me just to give you and your mates a laugh!"

I looked through the open bedroom door, Sarah was still naked and Ron was just pulling his underpants off, his four friends that had held Sarah down to the bed for me to fuck her were still in the room watching my sister and our cousin fucking.

'Play a trick on me would you?'

I went down into the living room and picked up the telephone, I dialled my home number and when my father picked up the telephone I covered the mouthpiece of the telephone with a dish cloth. "Your Sarah is having sex at her Cousin Ron's party over at Cedar Tree Farm!"

I slammed down the telephone, I'd been forced into saying more than I'd wanted to, as soon as I mentioned Ron I remembered that our family had so many Ron's that it could have taken my father all night to go around every one of our cousins called Ron and the longer I talked on the phone the more chance that my father would recognise my voice.

The main party was spinning down and most people who were left at the party were up in the bedrooms fucking. I opened the front door and scrawled 'Sarah' and put a large arrow under it in the shape of a flight of stairs. I did the same outside Ron's bedroom.

I heard my father's car on the drive; I went through the kitchen and out into the back garden as my father ran in through the front door. I could hear the explosion half way home. I just managed to get in home as my father returned home with a genuinely crying Sarah.

There was an almighty argument downstairs as I slipped between the sheets of my bed. Sarah opened my bedroom door and I pretended to be asleep. Sarah had been grounded for three months and because our father had seen Sarah's friends entertaining large numbers of boys with their bodies in the other bedrooms she was banned from associating with her friends as well. Sarah was about to say something to me but dad shouted up the stairs, "Straight to bed young lady!" so Sarah closed my bedroom door without speaking.

Breakfast was awkward, sad faces and stony silences. As we walked to the bus I started apologising to Sarah for fucking her, "I didn't know that it was you under the sheet, Ron put me up to raping you!"

"And what about after?"

"After..." I said innocently, "...I ran all the way home, I threw up on the field path on my way home I was so sickened at fucking you!"

"You didn't phone dad?"

"No, shit, I'm not about to tell our father that I'd just fucked you."

"No! Not about that, about me and Ron!"

"You and Ron, what about you and Ron?"

"You mean that you didn't know that I agreed to let you rape me for Ron as a joke on you?"

"I had no idea!"

"Well, if that's true then I'm sorry I put a dose of Ipecac in your breakfast this morning...you're going to be a little uncomfortable in about an hour's time."

I had a hell of a day at school, I was dancing to the toilet for a crap about every ten minutes throughout the day. I lost about a half a stone in weight before the effects of the Ipecac wore off. Sarah was being shunned by her friends at school and on the bus ride home for the first time in memory she was forced to sit next to me as her friends wouldn't talk to her because our father had telephoned their parents and told them about the party the night before.

Sarah had planned a full weekend of social activities and I'm sure that because Cousin Ron's parents were away all weekend he probably figured highly in her plans but that was all destroyed now. I was in my bedroom working through geography homework and beginning to regret electing to do geography instead of art, my door opened and Sarah slipped into my bedroom, "Did it really make you sick ... you know ... after you had sex with me?"

"It wasn't the sex ... so much as the fact that I'd been tricked into doing you against your will."

"So ... it wasn't actually fucking me that made you sick, just the fact that Ron was playing a cruel joke on you because you'd forced him to invite you to his party then!"

"Yes, why?"

"Well, I've been grounded for three months and going without sex for that long will drive me crazy ... so ... I was hoping that you might want to do it with me a few times ... you know ... just to help to keep me sane!"

"You're crazy, if I get caught fucking you dad will kill me. And then what, as soon as your grounding is over you'll go straight back to your boyfriends and I'll be left to wank myself thinking about your mates again!"

"I'll make a deal with you, you look after my needs at least once a week for the next three months and I'll be available to you at least once a month for the rest of your life!"

"What if I make you pregnant?"

"You won't, I'm on birth control implants, I used Cousin Anna's ID at the Family Planning Clinic, I don't want kids, they ruin your body when they arrive and then they ruin your life for the next eighteen years!"

"Okay, so when do you want to do it?"

"Sunday night, I'll sneak into your room after mum and dad go to bed, I'll need a fix to face a week of boredom at school!"

I thought about it for a moment, I would have jumped at her offer, even if it was just thirteen fucks in three months and then never again but she had opened the door to a regular fuck.

"I'm not sure ... I know you, as soon as your three months are up, you'll drop me like a stone!"

"No, I won't ... actually... well, you weren't actually bad ... you know ... Ron made me pretend that I didn't want to fuck you but ... you actually got me off and not many boys do that. I promise you that after I get my freedom you can fuck me at least once a month, every month for as long as you want to and if I'm really, really busy ... I guarantee that I'll make time for you on the last day of the month no matter what, no matter how busy I am."

I didn't push it further, one fuck, many fucks, either way I'd be a happy boy ... I'd just have to thank the Gods of sex if I still got a crack at my sister after her three month punishment was up.

I'd almost forgotten about my deal with my sister, Sunday was rather full for me, I'd scored three goals in my football match on Sunday morning, the improvement in my game was probably down to the fact that I'd finally lost my virginity and I wasn't looking at every girl standing on the touchline watching our game as a potential 'Mate'. I was so focused on the game that I spotted every opportunity and because I wasn't grandstanding, I was just applying good craft and it had paid off with goals.

On Sunday afternoon, because I wasn't hunting skirt, I met with my friends and got to use a quad-bike in the woods for an hour so by dinner time on Sunday evening I was on a real high while Sarah was still in disgrace and was eating in total silence, as soon as she finished eating, she went to her bedroom. I was still eating and jabbering to my parents when Sarah's music started, I'd guess that her music was set to volume four rather than her usual choice of ten. Not one window rattled and in the dining room we could still communicate without using megaphones for a change.

I went to bed at ten o'clock and because of the amount of exercise I'd had during the day I went straight to sleep but I didn't stay that way for long. As soon as our parents went to bed at eleven o'clock, Sarah slipped into my bedroom, mum and dad were still moving about in their room, getting ready for bed, using their en suite bathroom when Sarah woke me up with her mouth. I was wearing my usual pyjamas, underpants and vest when I went to bed, when I woke with Sarah's mouth around my cock, my pyjama bottoms were around my knees and my under pants were tucked under my balls, "At last, I thought you'd never wake up, get undressed quickly, I'm desperate!"

I shook the sleep from my head and looked down, Sarah's mouth slipped over my cock again and she sucked me deep into her mouth, Sarah was totally naked and I joined her in thirty seconds. Sarah wanted me to fill her cunt as quickly as I could, not just with my cock but with my spunk. I thought that it was going to be a wham-bam and thank you ma'am kind of thing, that Sarah would run back to her own room as soon as I'd filled her cunt but that was kind of counter intuitive, my climaxing quickly wouldn't really do much for Sarah, surely she would need more than just a full pussy, she'd need her own orgasm as well.

I rolled off of my naked sister gasping for breath and lay at her side, she slipped her arm under my neck and pulled me closer, "Did you like that?"

"It was great Sarah ... you were great..."

"Good, now that you've emptied your balls I want you to make love to me!"

"You'll have to give me a few minutes to get hard again..."

"No ... stupid boy, that's fucking, I want you to make love to me ... I expect at least three orgasms before your cock touches my cunt again."

I was confused; to me fucking was making love ... wasn't it?"

Sarah, even though she was two years younger than me, guided my education over the next three hours, she taught me how to make love, how to perform foreplay, how to give her pleasure without using my cock. Sarah taught me that almost every inch of my body could be used to perform sex, to give her pleasure, even to the point that I could blow against her clitoris to increase her pleasure without even physically touching her.

"When you put your cock on my cunt it really should be the end game, when you can't think of any other way to extend my pleasure any further!"

At three o'clock I finally heaved my body on top of hers again and I plugged my cock into her dripping wet fanny, she controlled my speed and intensity, she held me fucking her for close to an hour before she dug her spurs in and let me finish off in her. My orgasm was so powerful when it finally came that I made so much noise that I worried that I may have woken my father and my balls actually hurt as they finally emptied into Sarah's cunt, flooding her body with such a volume of semen that I began to think that I might have to swim out of her cunt.

I was drained in more than one way; it was close to four o'clock in the morning and I'd been exerting myself for more than four hours and I would only get three and a half hours sleep before I'd have to get up for school. Sarah surprised me again, I'd expected her to run for her own bedroom as soon as we were finished with sex but she didn't, she slithered next to me in bed, both of us still naked and we went to sleep together.

At six thirty, my mother knocked my bedroom door as usual to wake me up but unusually my bedroom door swung open and my mother, instead of telling me to wake up just managed a gasp, I was totally naked and laying on my back with my early morning flagpole standing to attention, fortunately Sarah wasn't still in my bed with me. I yanked my covers over my cock and mum apologised for opening my door on me. Dad passed my mum in the hallway and they both went down to the kitchen.

I dragged my dressing gown on and headed for the bathroom, the door was open so I dragged my sleepy body in and bolted the door behind me. I turned and aimed my cock at the toilet pan and suddenly a hand slipped out from behind the shower curtain and held my cock for me. Sarah was naked in the shower cubical, she held my cock as I took my early morning piss, Sorry about leaving you exposed like that bro, I didn't hear mum and dad until they flushed their toilet, I didn't even have time to get down to my own bedroom, I had to hide in here."

Sarah shook the dew from the end of my sewer pipe and then she pulled me into the shower with her, we showered together and Sarah gave me an orgasm with her hands as she washed my body and we both went down to breakfast together just wrapped in our dressing gowns with wet hair. Mum looked confused, for a start off, there had been no argument as to who used the bathroom first and she had only heard the shower running once but I saw her shake that thought off, I think she was just happy that for the first time in years, breakfast was a civilised meal, Sarah buttered my toast for me while I filled a bowl with cereal for her and we engaged each other in a conversation about school rather than attempting to score points against each other as usual.

I had thought that, as per our agreement, Sarah and I would spend all week going our separate ways and come together a week later and bump the ugly on Sunday night again but I was once again wrong. At lunch time Sarah dropped into the seat next to me in the school dining room, she looked unhappy and she didn't really say anything to me but I guessed that her friends were still not talking to her because of our father ringing around all of her friend's parents to tell them what had been going on at Ron's house.

Sarah knew that I didn't like carrots, she didn't 'Love' them but she used her fork to pick over my dinner plate and removed all of my carrots, she stabbed one of her roast potatoes and shook it onto my plate, I did love roast potatoes. Sarah leaned in and whispered, "Can you come for a walk with me after lunch please?"

I cut my windfall potato in half and shook salt on it, "Sure, okay ... if you like!"

We finished our food together and at twelve thirty I followed Sarah out of the school grounds and over to the park. "So, why are we over here Sarah?"

"I was hoping to get a cuddle or something; School has been horrible this morning."

I wrapped my sister in a loving cuddle and we kissed, she whispered, "Will you give me an orgasm now if I promise to reciprocate when we get home tonight?"

Sarah was the smartest thirteen year old I knew but she was dumb when it came to boys, any boy at school would finger her without the promise of reciprocation, me included, getting a finger into a girl's cunt was classed as sex to a fifteen year old boy, getting a hand job back was golden, the cream on top of the cake.

I gave her a gentle rub as we kissed in the rain shelter between the old toilets on the park, I timed my work so that I took her to her orgasm at one twenty, just ten minutes before school resumed and for the forty minutes or so that we were together in the shelter we kissed and cuddled all the time. After I finally got Sarah off she thanked me, "See you on the bus home after school, I'll save you a seat."

Well, that was a change, Sarah used to ask me if I actually 'Had' to catch the same bus as her to get home from school and now, because she was a social leper, she wanted me sitting next to her on the journey home.

After school, Sarah was on the bus first, there was a clear space of five seats in all directions around her, I dropped into the seat at her side, she didn't seem as depressed as she had at lunch time and as we sat together she started to talk to me as if I were her friend instead of her older brother.

At home we both went to our rooms to work on our homework, Sarah put her music on in her room but she joined me in my room with all of her books, "What can we say if we're caught together in my room?"

"I'll tell mum that I needed help with my Algebra homework."

"Do you need help with your Algebra homework?"

"No, I promised you a wank for helping me get over a bad morning. We sat together at my desk, Sarah was using her left hand to rub my cock as she was writing with her right hand, she brought me close to my happy time over and over again until mum called up to us that dinner was ready and then she sped her rubbing up and tipped me over into my orgasm before running to her own bedroom again to dump her books.

We watched a little TV before bed and as I was changing for bed, Sarah slipped through my door, "Can I sleep with you please, I promise that I won't keep you awake, I just want to be close to someone tonight."

It was a massive risk, if one of our parents popped in to either of our bedrooms to check on us we would have been busted but I thought it would be worth it. I'd already changed for bed but Sarah talked me into stripping off again and we both slipped into my bed together totally naked, Sarah wriggled into my side so that every inch of her body was pressing against mine and we both of us slipped off to sleep in moments, I didn't even hear our parents going to bed at their usual time.

I woke up at four o'clock in the morning, Sarah's head was missing from the pillow at my side, only one part of her body was touching mine now, just her mouth, touching my cock. I stroked my hand through her hair, she popped her mouth off of my cock, "Sorry bro, I couldn't control myself, can I use this now that I've got it hard? I won't keep you awake for long honestly."

Sarah didn't wait for my answer, she wriggled her body up mine, as her lips covered mine she lifted her leg over my hips and climbed onto my cock, "I'm sorry, this isn't a love thing, just a need, I'll be as quick as I can be and let you get back to sleep as soon as possible."

Sarah fucked me cow-girl style, she took just as much time as she needed, I didn't boil over this time, she just rocked herself to her own orgasm, apologised and fell asleep, she left me hard and plugged into her cunt, she fell asleep still on top of my body, her head against my chest. I did consider fucking up into her to my own orgasm but I'd emptied my balls more in two days than in any previous month so I resisted the temptation and I managed to get back to sleep quickly in our unorthodox positions.

There was a knock on my door again, my mother waking me up for school as usual, my door swung open as she knocked again and again, my body was totally naked, I was on my back and my flagpole was standing to salute the early morning sun.

"You really need to close your bedroom door properly!"

I mumbled under my breath, "Don't tell me, tell my sister, and tell her not to leave her toys out when she's finished with them."

I padded over to the bathroom, the door was open, I walked in and pulled the shower curtain open, Sarah was standing naked and giggling, "Need a hand with your piss today?"

"You left my door open again!"

"I can't latch it, they'll hear it, I barely have time to get out of your room, mum moves too fast. You need to get an alarm clock so I can wake up before mum and dad."

"Seems like a big expense for just a few weeks!"

"I've changed my mind, I like sleeping with you, I'd like to keep doing it after my punishment is over!"

"I'll try and find an alarm clock at the weekend."

We showered together again and Sarah gave me my orgasm, the one I hadn't taken at four o'clock when Sarah did me girl-on-top, this time, even though we were under water, Sarah took my spunk in her mouth and held a little back to snowball me after I'd finished.

That was pretty much the pattern for the next three years until I went to university, Sarah and I were together almost twenty-four seven, she did have a few boyfriends after her punishment was over but even if they satisfied her sexually she still ended the night in my bed, even if we didn't have sex.

Sarah missed me when I went to university in Bristol and after a few months she left home, she'd had a massive row with our father, Sarah was sixteen and dad caught her fucking on the local park and tried to ground her again, she turned up on my doorstep in the dead of the night and we started living openly together, telling everyone that we were married. I didn't return home after university, I got a job in Bristol and Sarah and I lived together happily ever after.

5,132 Words.

Click isabella-30-uk@hotmail.co.uk if you would like to comment on this, or any other story by Isabella.

Please help to support ASSTR by making a donation HERE