So this happened a couple of years ago when I had just turned 20 years old and my sister was 22. The two of us have always been pretty damn close - the age gap between us meant that we did a lot of things together ever since we were little, and we are very comfortable around her. She is probably my best friend in the entire world.
By the time this happened there had been some... let's say tension between us for a while. I always knew she was pretty, even while growing up, but it was only recently I had realized that my sister is smoking hot. She's always been pretty active, doing soccer and some athletics, which has given her this really tight, toned body. This, together with her pretty face and perky tits and yeah... She's hot. I'm pretty good looking too, if I may say so myself, and I like to do a lot of running and biking. I would often find her looking at me, checking my out in a way that didn't feel very sisterly.. and I would do the same to her, trying to sneak peeks at her tits or ass when she wasn't looking.
Anyway, I was home early from college one day when I decided to watch some porn, like you do. It was only me in the house, and as far as I knew no one else was supposed to be home for a few hours more. So I settled down in front of my computer, put on my headphones and went looking for something to jerk off to. It didn't take long for me to find something - a pretty hot step-brother/step-sister fantasy video. I'm sure you know the kind...
I pulled down my shorts, pulled out my cock and began to stroke it. It hadn't been more than five minutes before I got the shock of my life - just as I was in the middle of jerking it, I felt someone lean over my from behind, soft and warm breasts pressing against my back. "Oh, so this is the kind of stuff you like to watch, huh?" I heard my sister say... Turns out she had come home early that day, and I hadn't noticed because of the headphones.
As you might imagine I was incredibly embarrassed, and also kind of angry at her for sneaking into my room like that without saying anything. I was just about to yell at her when she surprised me by reaching down and ran her fingers over my hard cock. I really couldn't believe what she was doing. It was wrong, right? But... it also felt good.
I asked her what she was doing, but she just grinned and curled her warm fingers around my throbbing length. "So this is what you look like down there.... I've been curious, you know...." Once again I thought about protesting, but that's when she began to slowly stroke me. "Let me help you out with that..."
It felt so good. Better than any time I've stroked myself. Her fingers were warm and slender and knowing that they belonged to my sister just made it feel all the better. Slick pre-cum oozed from the tip,, and she teased her fingertips over it to get them wet and slick. On the computer screen in front of us the two actors were going at it doggy-style, the girl on all fours as the boy took her from behind. "Mmmm. Is that what you'd like to do to me, little brother...?" she asked me in a soft whisper, her warm breath moving across my skin. Her hand moved faster, jerking me in time with the male actor's thrusts as he sank his cock into the girl.
I couldn't speak at this point, just moan as my sister stroked me faster and faster as the action on screen intensified. Leaning over my chair as she was, I could feel her breasts against the back of my head, and let me tell you.. her nipples were rock hard, poking through her top.
All of this together meant that I didn't last long. The porn video hadn't even gotten through half its runtime by the time I was cumming, my dick twitching and jerking in my sister's grip. She kept stroking me even as I came, milking me for all of my cum, and I could hear her moan in my ear. I had never cum that hard or much before, making a huge mess all over her hand and my own lap....
"Good boy, " she whispered in my ear, and I can barely explain how nice it felt to her my sister call me that. "Let's not tell mom and dad about this, okay?" She lifted her hand up to her face and licked my cum off of it. "You taste good, bro. But you should probably go clean up before the others come home", she said with a wink before slipping out of my room again. I had to spend a few minutes to gather my breath before I could grab a shower...
The next few days were pretty awkward, at least for me, as I could not keep from getting hard any time I saw my big sister....
Things got pretty awkward with my sister after what had happened. I found myself getting turned on every time I saw her. Those days were pretty busy, too, and the rest of our family was always around, so I didn't get the chance to confront her about it until almost a week later.
It was only the two of us in the house that day, and I told her that I wanted to talk to her about what had happened. So we sat down at the dining room table to hash it out. Before I had time to say anything, she told me that she was sorry about what had happened and that she felt bad about it. She said she didn't know what had gotten over her�that when she'd seen me there with my cock out, she'd just had this irresistible urge to jerk me off, and that she'd been thinking about me in a sexual way for a while.
I think I surprised her by telling her that I felt the same way�she looked really shocked when I said that. I guess she must not have noticed me checking out her tits and ass constantly....
She asked if that meant I wasn't upset at her, and I told her that it did not�I was still upset about the way she'd gone about it. But also that I'd found the whole thing really hot.
We spent a while discussing what we should do next... and we both agreed that as long as we were both into it, there was no harm, right? It was not like it was going to hurt anyone else.
We looked at each other for a few moments, and then she asked me if I wanted to come up to her room. I knew instantly what she meant by that, and my heart started beating loudly in my chest. I told her that I very much would like to, and the next thing I know, the two of us are in her bed in nothing but our underwear.
My older sister was beneath me, wearing nothing but a pair of white cotton bra and panties, and I was just in my boxer shorts. Her hands were running through my hair as we kissed each other, finally allowing ourselves to succumb to those feelings we'd been trying to suppress for so long.
Her legs were wrapped around my hips, and my groin was pressing against hers. I could feel the heat and warmth of her pussy even through the fabric of our clothes, and I'm sure she could feel how achingly hard I was.
I guess it is at this point I should mention that at that time I wasn't very experienced. I'd had a few girlfriends, but we'd never gotten much further than kissing. Not only was I about to have sex with my big sister�I was also about to lose my virginity. So I'm sure you can understand why I was excited.
I don't know how long we spent like that, kissing and exploring each other's bodies. Might've been 5 minutes, or it could have been 5 hours. I never wanted it to end. But it did, when my sister told me that she wanted me inside her. She looked so sexy when she said that, looking up at me with her green eyes, her face flushed and her expression one of utter desire.
I felt her below and pulled her panties down, before she hooked her fingers into the waistband of my boxers to yank them too, freeing my now throbbing cock. I asked if we should use protection, and she just shook her head, telling me that she was on the pill and that it was a safe time for her anyway.
She slid her legs around my waist and pulled me closer to her until the tip of my cock was nuzzling against the lips of her pussy. She was dripping wet, and after she told me she'd never been that horny before. She knew that I was a virgin, so she told me to take it slow, to do things at my pace. I thrust forward slowly, pressing my tip against her slit, hearing her moan the sexiest little moan. A little more pressure and I could feel her lips part, slide over my swollen cockhead... and then I was inside. The warm, wet, tight heat of her body enveloped me, and it was the best feeling I'd ever experienced. I cried out, glad that no one else was home to hear me.
My sister was looking up at me, a warm smile on her lips, letting me take my time. I pushed in deeper, feeling her pussy grip around me as more and more of my cock entered into her. I couldn't believe that I was actually doing this, fucking my own sister. I didn't stop until the full length was inside of her, my hips snug to her pelvis. We kissed again, and she ran her fingers through my hair, whispering to me that I was doing good. I began to move, slowly at first, working my aching dick in and out of her. As the pleasure of it all began to overwhelm me, I moved faster, trying to find a steady rhythm. It felt so good, much, much better than my own hand or even hers.
I didn't last long that day. As I said, it was my first time, and the eroticism of having sex with my own big sister was just too much for me to endure. I managed maybe two minutes before I came, almost without warning, pumping a bit and a thick load deep inside of her pussy.
Afterwards we spent half an hour just cuddling in her bed, both of us happier than we'd ever been. We both wanted to stay there for as long as we could, but we knew we had to clean up before our family returned home. But we did make a promise that we'd do it again the next time we got the chance...