(M4F) How my sister and I ended up the best sex of our lives

Hi there,

First of all, I would have never thought that when I was younger, but all those brother - sister things are a HUUUGE kink for me. That's because it's a thing that actually happened to me.

My father divorced my mom when I was something like 4 or 5 y.o. When I was around 10, he met a woman who he'd end up settling with, and this woman actually had a daughter around my age (a few months younger than me).

When I met her (let's name her Clara for writing convenience), we were both very young and neither of us thought about anything sexual. We bounded up really fast and had a very close "brother-sister" relationship. After a year or two, I considered her as my actual sister and reciprocate.

Time passed, we grew up, I had a girlfriend that Clara didn't really like, with whom I spent a few months, and had my first time at 16. I know Clara had a boyfriend too, for a few months, and I presume they must have had sex. I surprised myself thinking about it and getting really horny, a few after my breakup with my girlfriend. I started being really interested in my sister, and since she was also single at that time, I thought she might be a little bit into me too.

I tried making some very discreet moves, to see how she'd react. I had a few peaks sometimes, and was pretty sure at some point that she knew it and was letting me see some of her on purpose.

She grew way more close to me in a physical way, giving me hugs, resting against my shoulder, patting me sometimes. I won't lie, it was pretty damn hard to hide that she had a lot of effect on me sometimes.

Then, one night, she had a little party at home with some of her girlfriends. We were both adults now (and that makes it even better for this story, obviously), and still both single. After the party ended, I heard her going into her room but she didn't sound ok. 20 minutes after, she sends me a text : "Are you sleeping?". I replied that I was not, and she asked the permission to cross the hall and come into my room. Obviously it was ok for me.

She crossed my room door, wearing only a dolphin short with clearly no pants underneath (as I knew she didn't wear underwear under her pajamas) and a crop-top pajama shirt. It was a pretty hot summer night, so a pretty basic outfit for the night.

I invited her to come in my bed, which she did, and then she rested into my arms, telling me that something went wrong during the night because two of her friends fought over some guy - and probably because overdrinking. My sister told me she barely even drank and was perfectly sober.

The conversation then went to completely different subjects, as I was trying to cheer her up and make her laugh to move on after a crappy night.

One thing leading to another, I'm now playing with her in a more physical way, like doing tickles on the sides of her body. During the gentle fight though, I accidentally (really accidentally, actually) lifted her shirt up, revealing her beautiful breast. We both stopped for a second, looked into eachothers eyes, and then she burst out laughing, and we started laughing together.

She told me "Be aware of where you're putting your hands, there could be consequences otherwise". I asked what she meant by that, and the only answer I got was her starting to tickle me.

I became really aroused at this point, and was pretty sure she was hinting me that she was too. I tried tickling her upper legs, right under the limit of her dolphin shorts. She didn't stop at all, and then I gently reached the upper part of her thighs. I heard her breathing a bit heavier and felt her legs spreading a little bit as my hand was moving upwards.

My heart was pumping like 200 beats per minute. I knew what I wanted and knew she wanted the same thing as me, but a part of me was screaming that this was a very inappropriate thing to do with my sister.

I went back to tickling her upper body, this time purposely brushing her tits. As my hand was almost under her shirt, she instantly straightened on the bed, took her shirt off, giving me the view of her incredible tits for a second, a proceeded to kiss me so intensely that I immediately got hard as I probably never was in my entire life.

I'm gonna stop this story here, as I want to live some room for rewriting things with you if you're interested in it.

I'm available for long term discussion, playing, sexting, or even going further in this story (F only please - I'm a straight man)