Uncontrollable.

Mmmmm, that felt good, in fact, that felt really good. Somebody was touching my cock, hands wanking me off. I was just waking up, groggy and not sure where I was, a raging hard on between my legs. I tried to move my hands down but couldn't, my legs too wouldn't move.

It was coming back to me now, I was handcuffed to the bed, naked, my hands up over my head, my legs were tied to the bed posts. My girlfriend had put them on, my parents were away and I thought my luck was in, some early morning kinky sex. Then she started shouting as she told me she had heard about me cheating. She stormed out and left me here stuck to the bed, I must have drifted off after a bit.

She must have come back though because that felt good, hands caressing my cock, fondling and exploring my balls. I opened my eyes and looked down.

That wasn't my girlfriend.

"What the fuck sis," I shouted.

There, with her hands wrapped around my cock was my younger 18 year old sister Jenny, staring up my naked body at me, grinning.

"Get off, you're my sister," I continued, "what the fuck are doing?"

She blushed, and brushed her long dark hair behind her ear. "I want it," she said.

She continued to move her hand up and down my shaft, my throbbing 7 inch cock looked huge in her hands. She could barely fit her hands around the thickness.

I tried to wriggle free but it was no good, part of me didn't want to get out, enjoying the feel of my cock being stroked.

As she wanked me off with one hand she cupped my scrotum with the other, squeezing them and rolling my balls in her fingers. I groaned.

"Oh god, please stop sis," I pleaded.

"But you like it," Jenny said, "I just want to play with it."

She was staring up my body into my eyes, a shy smile across her pretty face. She was playing with a bit of precum on the head of my penis. She bent forward and licked it, and then ran her tongue up and down my shaft, occasional kissing it.

She moved back up and took my cock in her mouth, her lips open wide as she forced me in, pushing her head down. She couldn't take much of me in but it felt so good, my cock hitting the back of her throat.

She started bobbing her head up and down, her long black hair falling over her face, she pushed it behind her ear and over her shoulder. She ran her hands over my six pack abs, and then back to my cock, wrapping her hands around the bottom of my shaft and stroked whilst her mouth continued to swallow me in.

She continued this for a while, I was now unable to argue, it was too late. I would have to have a serious talk with her when this blowjob was over, thinking that was as far as it was going to go.

Boy was I wrong. My sister took her mouth off with a pop, her saliva covering my cock and stringing out between her lips and my cock. She let go and my cock slapped hard against my stomach.

She then crawled up between my legs, her body rubbing against my hard member, she continued up and straddled me, her legs open either side of my hips. Her mound was pressed against my rigid cock.

She was wearing black leggings tight against her skinny legs, no socks, they were low on her boney hips, showing off her flat stomach. My gaze followed her ribs up to her small breast, concealed behind a tight vest top, her nipples hard underneath. Her skinny shoulders and slender neck arched back.

She rubbed her pussy through her leggings against my cock, grinding it into me, the crotch pushed into her folds, my cock sliding up and down her now wet cunt, a thin layer of fabric stopping me from fucking my sister.

"This is so wrong sis," I said, "please stop before it's too late."

"It's already too late, I want to cum," she groaned.

She was breathing fast now, groaning with every thrust of her hips, building up a rhythm on my cock, faster and faster.

I watched her, I knew my sister was pretty but seeing her arched back, moaning, made me think of her in a different light. She had grown up into a sexy young woman. As much as I tried to fight it I felt my orgasm growing.

"Oh fuck," she said. Her hand went down over her toned stomach and down under her waist band, she started rubbing her clit.

This was the last straw, "I'm going to cum," I groaned. My cock twitched against her pussy and I erupted all over my stomach, stream after stream of cum covering my abs. My sister was still grinding down on me, furiously rubbing.

She watched my jizz spunking out and screamed in ecstasy, orgasming hard. I felt her leggings soak as she squirted her juices into them and onto her hand, her hips spasmed on my lap, her thighs shaking hard.

"Fuck, fuck, fuck," she groaned as she couldn't control her shaking body. She rolled off to the side, her legs crossed on her hand, holding her pussy, and she lay on the bed next to me, small shocks rippling through her body.

It was so hot, I watched her slowly recovering, my cock twitching and dribbling cum on to my belly.

She sat up and ran a finger through the cum on my belly, lifting it to her mouth and tasting it.

"Are you finished fucking about now, let me out of these handcuffs." I said.

"Yeah I feel better now," she said, smiling. Her face flushed red.

She got up and found the key on the bedside table, she undid one side of the handcuffs and ran out the room.

By the time I got my other hand free, untied my legs and got dressed, Jenny had disappeared. Her cum soaked leggings were on her bedroom floor, I couldn't help but pick them up and feel the wetness, I smelt in her juices. Fuck this was so wrong.

I was angry though, she shouldn't have taken advantage like that, she was going to pay for that stunt.

I heard her come home sometime later in the afternoon whilst I was in my room. I left it a little while and then went downstairs.

I found her in the utility room putting her leggings in the washing machine. She was bent over with her small pert ass on display and sticking in the air. Perfect I thought.

She was wearing a tiny pair of red sports shorts, with the black vest top still on. I moved quickly and pinned her up against the washing machine making her jump.

"Fuck you made me jump." she said. "What are you doing, let me go."

"No, it's payback time," I said.

I reached down with my right hand and put it between her legs from behind. Cupping her pussy through her shorts and pushing my finger and the crotch of her shorts between her lips.

Jenny groaned and pushed her ass back into my hand, "oh please don't, you're just so horrible," she said sarcastically.

I moved my fingers up and down her slit, then up to her clit, pushing down, slowly caressing, she groaned.

This wasn't really going to plan, I thought she would at least put up a bit of a fight, this wasn't exactly payback if she was enjoying it too much.

I could feel her heat and juices through her shorts now, my cock hardening, it was too late for me to stop.

I stood behind her and ground my cock up against her ass, pulling her up against my body, her back stretching into me. I ran my hand around her thigh and upto her stomach, feeling her skinny frame, the hardness of her ribs. I caressed her small breasts through her top and then back down her flat stomach to the waistband of her shorts.

I pushed my hand down inside her shorts and she groaned loudly as I reached the top of her cunt, brushing her clit. She pushed her hips back onto my cock, nestled in between her ass cheeks, separated by a few layers of clothes. I pushed into her, grinding together.

My fingers reached her swollen pussy lips, and I pushed a finger in, she was so tight and wet. I pushed deeper, Jenny moaning.

"Feels so good," she said, breathing heavily.

I wet another finger in her juices and then moved to her clit, starting to rub, building up a rhythm. She started moaning continuously, so I moved my fingers faster. Grinding my hard cock into her, feeling my orgasm grow as I dry humped her.

"Keep going, I'm fucking cumming," she said, her eyes closed, head nestled into my neck.

She let out a loud groan and orgasmed onto my fingers, her juices squirting into her shorts. Her legs buckled and I held her up against me, feeling the spasms surge through her body. Her ass twitching and grinding into my cock.

"Oh god, I'm going to cum too," I said, trying hard not to.

"I want to see," Jenny said, she pushed back into me, spun around and dropped to her knees. She yanked my shorts and pants down, my cock popped out nearly hitting her in the face. She grabbed it and started stroking, inches from her face.

"No wait, I can't hold it," I groaned. I ejaculated straight into her face, cum hitting her in the eye and cheek, another streak hitting her top lip. She opened her mouth and took a stream down her throat, swallowing it down. As it got less powerful cum hit her in the chest, covering her vest top.

She watched as it dribbled down over her hand, transfixed.

I was too, staring at her beautiful face and body covered in my cum. This was so wrong, she was my little sister but it was spinning out of control.

She stood up, licking my cum off her hand. "I better go shower," she said, "thanks for the pay back bro."

She walked out, leaving me with my pants round my ankles, cum dribbling out the end of my cock. Sure showed her, I thought.

Later that evening I was sat watching a film, Jenny came in wearing a short pink pleated skirt, high on her legs and low on her boney hips, on top she just had a white sports bra.

Fuck she looked so good, so slim and taut, her flat stomach and thin waist drawing my attention.

She came and sat next to me snuggling in, I put my arm around her, it felt nice, her warm body pressed against mine. I brushed her hair out of her eyes and she looked up at me. We locked eyes for a second and then went back to watching the film.

She put her hand on my naked leg just below the leg of my shorts, squeezed it and then moved her hand up, venturing up my shorts leg. I was useless to resist, my cock already getting hard, I wanted to see how far she would go now.

Jenny's hand went up the leg of my shorts and grasped my cock, she rubbed her hand along the shaft and back again, blood pumping into it, becoming a solid muscle.

She continued to wank me off through my shorts as I ran my hand down her thin arms and over her slender back and prominent ribs. I moved to her ass and squeezed her cheeks, she had no panties on. I ran my fingers down her ass crack, over her anus, making her groan, and continued to her pussy.

I touched her between her legs, pushing a finger between her pussy lips, a dribble of her juices escaped, covering my finger, coating it. Jenny groaned.

I pushed my finger into her cunt, feeling her wet warm insides. She was so tight, squeezing my finger as I pushed it deeper. I pulled it back out and then straight back in again, I felt around inside making her groan again. I found her clit and rubbed it gently, a slow rhythm building.

Jenny let go of my cock and started undoing my shorts, reaching into my waistband and pulling my rigid cock out. She wrapped her hands around it and pulled my skin down admiring my glistening head being revealed, a small drop of precum leaking out.

She bent forward and licked the precum, her tongue gently touching my penis. She then licked around the head making me groan.

Without warning she took my cock in her mouth, pushing it down her throat, gagging and then coming back up.

"Fuck," I groaned, "this is too far, you're my little sister," I stammered, but didn't stop her.

She replied by forcing me back down her throat and then bobbing her head up and down, sucking me off. She started caressing my balls with her hand.

I was still pushing my finger in and out of her, I stopped for a second, coated another finger in her juices and then pushed both into her. We were lost for a while in the sensation, Jenny sucking my cock and me finger fucking her tight hole.

After a little while Jenny stood up and straddled my lap, my cock flat against my torso. Her skirt covered my lap. She positioned her cunt on the shaft of my cock, her pussy lips either side, her clit pressing down hard on my length.

"We can't fuck," I weakly argued, desperately wanting to enter her.

"I just want to feel it against me," she said, starting to grind back and forth, her clit riding up and down the length of my cock, covering it in her pussy juices. She was groaning now.

I groaned too. I could feel her warmth and wetness on my cock, pulling my skin back and forth, her pussy lips wanking me off. Fuck it felt good.

I put my hands around her thin waist, feeling her ribs, I ran a hand over her flat stomach and up to her small breasts, squeezing and caressing, playing with her nipples through her vest top.

I moved my hands down to her thighs still moving back and forth over my lap, I pushed her skirt up to reveal her cunt grinding on my cock, her narrow hips thrusting forward and back again.

"Feels so good," she said, groaning. "I'm going to cum."

She was grinding hard now, her juices leaking out all over me, grinding fast. She moved forward too far, lost in her lust, my cock pushed against her opening, the tip entering her.

She didn't realise and slid back fast, she was so tight but drenched in her juices so I slid in easily, my cock filling her up, pushing deep.

"Oh fuck," she screamed. Jenny orgasmed hard on my cock, squirting over it deep inside. Her tight cunt squeezed my cock, contracting on my shaft. Her pelvis and thighs shook on my lap. Her face contorted in ecstasy, eyes shut, she looked so beautiful.

I didn't care that she was my sister now, I needed to cum, my cock raging hard inside her.

As she came down from her orgasm I slowly lifted my hips thrusting into her, starting a slow pace. She was still groaning.

I couldn't believe I was fucking my sister, it was so wrong but she was so hot. She started moving up and down on my cock, her hips sliding back and forth. It felt so good, the skin on my cock being pulled up and down by her tight dripping cunt,

Jenny rode me for a bit, both of us groaning, Jenny staring in my eyes as she fucked me. I wasn't going to last long like this and wasn't ready to finish yet.

I moved forward and stood up, easily lifting Jenny's small frame, she slid all the way down on my cock, filling her entirely, she screamed in pleasure.

Her legs wrapped around me as I took her waist in my hands and started lifting her up and down, her pussy sliding up and down on my shaft.

I was way too close now, my orgasm building. I lifted her off my cock and set her down, I positioned her with her back to me on the sofa, her knees on the seat of the sofa and she instinctively put her outstretched arms on the back.

Her ass pointed towards me. I knelt down and kissed her firm pert ass, moving in towards her tight ass hole, running a tongue over it and making her groan. I pushed my tongue in a tiny bit, teasing, and then moved down to her cunt.

Her pussy lips were engorged and dripping, I needed to drink her in so leant forward and ran my tongue up between her lips, taking in a mouthful of her juices. I pushed my tongue in, my nose touching her anus, breathing in the smell of her asshole, it was such a turn on, my cock nearly exploding then.

I moved to her clit sucking gently and flicking with my tongue making Jenny groan again. She was pushing back into my face, forcing my tongue harder onto her clit.

I pushed my tongue back into her, she was so wet her juices ran over my tongue and down my throat, her warmth sliding down my throat.

I was desperate to cum now so I stood up and positioned my cock against my sisters wanting pussy. I pushed my hips forward and my cock slid in. I pushed in half way and pulled out, her hole gaping, I pushed back in, deeper this time, pushing all the way till my pelvis hit her boney ass, causing Jenny to groan loudly.

I grabbed her thin waist and started thrusting my cock in and out of her, looking down and seeing it sliding in and out, stretching her tight hole.

I looked at her toned slim back and her slender neck, so pretty.

I took hold of her arms and pulled her back against me, still pumping away on her dripping cunt. Her body arched backwards pressed against me, her flat stomach and breasts stretched tight. I ran my hands over her breasts, sliding then up under her top, squeezing.

I ran one hand over her stomach, ribs and skinny hips, moving slowly to her clit, gently rubbing causing Jenny to groan loudly.

"Fuck yeah, keep going," she groaned.

I was slamming in and out of her now, my orgasm building. I started vigorously rubbing Jenny's clit, wanting her to cum again on my cock.

"Yes, yes, yes," she screamed, "oh yes."

Her body went rigid as she orgasmed again, spasms again racing through her body, trembling against me, her tight cunt squeezing my cock, a warm gushing sensation coating it thoroughly.

"Oh fuck," I gasped as I orgasmed too, my sperm rushing up my shaft and exploding out of my cock, hitting my sisters insides and filling her up, stream after stream ejaculating out.

I continued to thrust hard into her with every squirt, making sure she took all my cum. Her tight cunt milking it all out of me.

Jenny recovering from her own orgasm realised what was happening.

"What the fuck," she shouted angrily, "please tell me you didn't just cum in me."

She pulled forward and my cock sloped out of her, she reached back between her legs just as a river of cum leaked out of her cunt, covering her fingers.

"You bastard," she said standing up, more cum running out of her onto the carpet.

"Sorry sis, I didn't realise," I replied, smiling.

She hurried out the room, leaving a trail of my cum behind her, running towards the bathroom.

"You started it," I shouted after her.

The End.

Thank you for reading.