Parts 1 & 2 are in my recent posts. You’ll find them if you click on my username. You can read this as a standalone, but it’s probably better if you read them in order.
Anyway, the story…
Becky had been on top of me, but after her orgasm courtesy of my mouth, she had slid off me and was lying by my side. I could feel her hair spread across my thigh, could still feel the sensation of her mouth and throat around my now deflating cock.
We lay like that, brother and sister side by side in the darkness, probably like countless other siblings had done before. The only difference was that I doubt many of them would have had the taste of each other’s cum in their mouths. Or maybe they would have. I was finding out a lot of things about my big sister that night that I hadn’t even dreamed would have been true before she told me.
“Becky,” I said, turning on my side and stroking the side of her thigh. “What did you mean by that? What is it I don’t know the half of?”
I was half expecting her to push my hand away, to refuse to answer and have another mini meltdown like she had earlier, but she didn’t.
“Are you sure you want to know, Jack?” she asked.
“Yeah, I’m sure I want to know.”
I heard and felt her shift in the darkness, and I guessed she was now lying with her hand propped up on one hand. I gasped a little as the fingers of her other hand began to stroke and squeeze my still wet cock. She gripped the head of it with thumb and forefinger and worked them back and forwards on it, running her thumb up over my pee hole and circling it. I’d already cum three times in the past hour, but I knew if she kept on doing that it wouldn’t be long before I was ready for a fourth.
“Okay, but before I tell you, do you have any idea what I might have meant? It would make it easier to say the words if you did.”
My breathing was already quickening. She was playing my cock like a maestro, knowing exactly where to press and where to stroke. I slid my hand further up her thigh until I found her pussy. I pushed her legs open and cupped it, squeezing her entire slit and mound in my hand. She was still soaking wet.
“Alright,” I said. “I think that tonight wasn’t the first time you’ve sneaked into my room. Am I right?”
“Uh huh,” she said, rocking her hips gently back and forth, rubbing her pussy into my grip.
“And,” I continued. “I don’t think it’s the first time you’ve touched me while I was asleep.”
“Right again.”
“Probably not the first time you’ve sucked me off?”
“Not even close to the first time. Did you know that you can cum in your sleep?”
“Really,” I asked, slipping a finger between her pussy lips, enjoying the heat and wetness of her snatch.
“Uh huh,” she breathed. “As long as I was gentle, and very quiet, I could make you release your cum without waking you. Although, and I need to say this for my own sake, I honestly convinced myself that you were enjoying it. I think it was just a coping strategy, a way of reducing the guilt I felt after every time I did it. I knew how wrong it was. Do you hate me?”
I slipped a finger inside her, started to slowly work it in and out of her hole, pulling it out and rubbing her juices around the outside of it.
“Does it look as if I hate you?” I asked. “I mean, I am a little pissed off with you, but only because you didn’t ever do it when I was awake.”
She shuffled her body a little bit further up the bed, pressing her pussy harder into my hand in the process. I felt her breath on my balls a second before her wet tongue began lapping at them; big, slow, warm licks all over my nutsack.
“Promise?” she asked between licks.
I closed my eyes and released a deep groan, the sensation of her tongue heaven on my skin.
“Becky, I was fucking obsessed with you. You know that. From what you said earlier you knew I’d never have said no if you’d asked me if I wanted you to suck my dick.”
“I know,” she murmured. “But I couldn’t. It’s so fucking wrong, Jack. You’re my little brother. I’m your sister. I felt so dirty doing what I did. There’s no way I could’ve admitted it to you.”
She sucked one of my balls fully into her mouth, suckling gently on it, little wet noises escaping into the stillness of the room.
“But you like feeling dirty, don’t you, Becky?” I asked.
“Mhmm,” she agreed without taking my nut from her mouth.
“You like feeling like a dirty little girl, don’t you?” I pushed a second finger inside her, curling it and rubbing hard on the inside of her pussy mound.
“Fuuuuuck,” she groaned, letting my ball fall from her mouth and switching to the other one.
“Say it,” I said. “Tell me what you are.”
She released my nut and grabbed hold of my quickly thickening cock, pressing her face against the base of it.
“I’m a dirty girl,” she breathed onto my shaft. “I’m such a dirty girl.”
“And what do dirty girls do?” I asked, gripping the back of her head and pulling her face tight against my cock. She ran her mouth along it sideways, dragging her tongue the length of me.
“Dirty things,” she said.
I slipped my hand around the base of my cock, bending it downwards. Her greedy little mouth found it and latched onto it instantly. She sucked it hard, pulling hard on the way out of her mouth, more gently on the way in, like she was milking me.
“More,” I insisted. “What do dirty girls do, Becky?”
She pulled off me for a second to answer.
“They suck their little brother’s dick,” she said, panting. “I sucked my little brother’s dick because I’m a dirty, dirty girl.”
I was finger fucking her with my index finger and the one next to it, I had my other two fingers curled outside her. I could feel the knuckles of them banging against her asshole. Without asking, I straightened them and forced them into her asshole. She screamed, probably with pleasure, but I didn’t care if it wasn’t; she owed me, and I knew she would let me do whatever I wanted. Two fingers in her cunt, two fingers in her asshole. I fingered her hard, slamming my hand against and into her. Her pussy was tight, but her asshole was doubly so. With her pussy I could feel it gripping mainly around the entrance to her hole, but her little asshole gripping the entire length of my fingers. I fucked her harder, spreading my fingers wide as I could as I did it.
I knew she was enjoying it when she began to circle her hips. She was back to sucking me off, gagging and choking on my length like a pornstar. We could’ve both cum again very quickly, but I wanted more than her swallowing my cum again. I pulled my fingers out of her holes and my dick out of her mouth.
“Please!” she shouted, the hunger clear in her voice.
“What else do dirty girls do?” I near shouted. When she didn’t answer I got to my knees and slapped her hard across the ass.
“Ow!”
“What else do dirty girls do?” I repeated, grabbing her hair and dragging her up to the top of the bed. She was now lying face down, me kneeling beside her. I held her in place with a firm hand on her back.
“I don’t know!” she said.
I straddled her ass.
“They take cock, don’t they?” I asked. “Dirty girls take cock, don’t they Becky?”
“Oh fuck yes! They do. Dirty girls take cock.”
I held the base of my cock, reached under her and pulled her hips away from the bed a little bit.
“Whose cock?” I growled.
“Their brother’s cock. Please yes. Dirty girls take their brother’s cock. Dirty girls need their brother’s cock. Please, Jack – I’m begging you. Fuck your sister’s cunt. Fuck your dirty sister’s cunt. Please!”
And I did.
I found her hole immediately, drove my entire length into her and dropped my weight down onto her at the same time, flattening her on the bed. I bent my knees and pulled my legs up round either side of her hips, gripped her shoulders tightly, and fucked her as hard as I could, my pelvis banging and slapping off her ass with every thrust.
I put my head right beside hers as I fucked her.
“Dirty little bitch,” I whispered in her ear.
She bucked against me, wanting me even deeper inside her. I held her down and continued driving into her with all my weight. My chest was pressed against her back, both of us sweating, the wetness making her body as slippery as her hole.
“I’m going to fuck your asshole,” I said right into her ear.
“No, please. Just my pussy, Jack.”
“What are you?”
“I’m a dirty girl,” she answered.
“Dirty girls take it in the ass, don’t they? Dirty girls take cock in their tight little brown hole, don’t they? You want your brother to fuck you in the ass, don’t you, Becky? Tell me you want it.”
She was quiet for a few seconds, grunting and taking my cock as hard as I could give it to her.
“I’ve never done it before,” she finally admitted. “Never had it in my ass.”
“Then your little brother is going to be the first one to fuck your asshole, and you’re going to take it.”
An idea popped into my head.
Still fucking her, pinning her down with one straight arm, I reached down beside the bed. It only took a few seconds of groping around blindly until I found what I was looking for wet.
As I picked the little red panties off the floor I almost came in her pussy at the thought of what I was about to do.
I pulled myself straight upright again, gripped her hair and pulled until her head lifted from the bed.
“Open your mouth,” I instructed.
She obeyed and opened it wide.
I balled the panties up and shoved them roughly into it, cramming the material in with my fingers until her mouth was stuffed. Those panties, covered in my cum and her cum and my saliva and her saliva were now effectively her gag. I knew she would be able to smell and taste our juices mixed together on them.
As soon as they were in I pulled my cock out of her pussy, held the base of it in my hand, pressed it against her trembling little asshole and drove it into her.
Becky’s entire body tensed and clenched. It felt so fucking good on my cock, and I started to pump into her hole as she squealed, the sounds muffled by the sopping wet panties in her mouth.
“Dirty girl,” I growled. “Dirty little girl taking her brother’s dick in her asshole. Dirty, filthy little bitch.”
I was almost losing control of myself. I had never in my life felt as powerful, as driven, as fucking obsessed as I did with my dick in my sister’s asshole. I had dreamed of this moment forever, and now it was finally happening.
I was vaguely conscious of the fact she might not be enjoying it as much as I was, until I felt her reach under herself and a second later her fingers on my cock.
My sister was rubbing me through the membrane that separated her pussy from her asshole.
She was finger fucking herself while her brother fucked her ass and her dirty, cum-soaked panties were stuffed in her mouth.
It was all I could take.
I roared her name into the night, gripped her by the shoulders again, and emptied my balls into her asshole. Even though it was my fourth orgasm in a short time I could feel heavy, thick threads pumping into her, filling her tightest little passage.
I thrust harder as it spurted out of me and into my sister, digging my nails into her back as the last few drops shot out. That was when she came, her fingers still stroking my cock through her pussy. The sounds of her cumming were just a garbled, gargled, muffled series of screams and grunts. Her asshole gripped my cock so tightly that I thought if I tried to pull it out I wouldn’t be able to.
I eventually collapsed on top of her, both us still shuddering and shaking, her asshole spasms dancing around my shaft. We lay there in the dark, panting, struggling to catch our breaths.
“I’ve wanted to do that for so fucking long,” I finally managed to say, my cock still inside her.
She said something in reply, but the panties in her mouth made it impossible to understand.
“You can take them out now,” I said with a smile.
Becky shook her head and said something that might have been, “Not yet.”
I stroked the side of her neck and realised that I had never been happier than I was in that moment. I was at complete peace with the world.
Beneath me, she bucked her hips gently a few times, which I took as an indication that she wanted me to get off of her. I pushed myself up onto straight arms, then onto my knees, pulling my cock out of her in the process. As I did I felt her try to tighten her ass to keep a hold of it.
As soon as my cock was out, Becky rolled onto her back, pulled her knees up to her tits, took the panties from her mouth and pushed them between her ass cheeks before straightening her legs again.
“I didn’t want to take them out of my mouth until I could catch your cum with them,” she said, somewhat shyly considered what had just happened. “Don’t ask me why, but it feels right that we should finish with them mopping us up.”
I laughed and put my arm around her, pulling her into my chest, then kissed her sweaty forehead.
“You really are a dirty girl, sis.”
“From now on I’m your dirty girl, Jack.”
I smiled at the thought of being able to fuck my big sister whenever I wanted. True, we wouldn’t get to see each other often from now on, but I knew that whenever we did it was going to be special. And I was sure we would be able to sneak into each other’s bedrooms for the rest of the holidays without being heard. I mean afterall, Becky had been doing it for years and never been caught.
I could hear her breathing change, get deeper, and I knew she was fast falling asleep on my arm. We’d need to be awake before mum and dad got there, but I wasn’t worried about that.
“Merry Christmas, Becky,” I whispered.
“Merry Christmas, Jack,” she managed, before falling asleep, my cum still dribbling out of her asshole.
Source: reddit.com/r/eroticliterature/comments/rkv5r0/a_christmas_gift_from_my_sister_part_3
!updateme
Part 4 starts with the parents walking in