I (M31) and my girl (F27) had to stay at my soon-to-be SIL’s (F22) house a few weeks ago as my girl had to work a contract where SIL lives. I work from home so I figured why the heck not go and hang out.

SIL and I are friendly, but not necessarily friends, just in the same place at the same time a lot.

Anyway, one day my gf has left for work, and I’m sitting on the couch drinking a coffee. Then all of a sudden I see SIL come around the corner in her towel and she said “are you coming?”

I had that moment where you’re hit with something and you have to regroup completely. I puzzled but decided that this was a direct invitation with plausible deniability baked in.

I went down the hall to the bathroom and saw the door was cracked and the lights were out. I gently knocked and sheepishly said “hello.” In the low light, she pulled back the curtain and looked me up and down and then pulled it back. My heart was racing at this point and I was considering my options.

And then the die was cast. I undressed and got into the back of the shower. She was just washing herself ignoring me. I hadn’t really noticed her body before this because she’s always been wearing jeans and a sweatshirt, but my god was it tight. And she looked up to see me admiring her fully as she propped and then shaved her leg.

I stood there, probably mouth breathing. She put the razor back in its cubby and then nestled into my chest. She looked up at me while she grabbed my dick. I’m no pornstar, but am endowed, and she let out a moan of approval when she now had me absolutely rock hard.

She bent over. I’m glad she was as wet as she was, because it was a very tight squeeze, and she let out some painful noises as I got all the way in. It was so good. She couldn’t keep quiet and in about 1 minute was shuttering to where she could barely stand. I pulled out and came all over her back.

I tried to hug her, but I think the post-nut clarity had got to her. She quickly and uncomfortably cleaned herself up and exited the shower. I didn’t know what to do. I got out to her wet combing her hair in her bathrobe, back to ignoring me.

I was getting my clothes together as it occurred to me: the chances of this happening again are near 0. I decided to be bold.

I reached over and grabbed her by the robe belt and yanked her over to the bed. She let out another moan of approval as I threw her on the bed and an “oh my fucking god” as I undid her robe to go down on her.

I put in a good effort, never wanting the moment to end. She came a second time, then a third. I was perfectly happy to go for four, but she loudly asked “are you gonna fuck me or what?”

I got on top of her and went to work and she was very into it. Having cum already, I had the stamina to show off what I could do. After trying out a few angles and speeds, I could tell she wanted it deeper. I put her feet above her head to get absolutely to rock bottom and really went to work. She was putty. I felt her cum on my cock.

At this point she says, “wanna see a party trick” and takes her feet, wraps them around my head and pulls me in for a kiss. That was all I could take. I was barely able to pull out in time and made a huge mess of her.

And then it was over as fast as it had begun. I left and we haven’t even shared as much as a knowing glance. Just both of us maintaining the status quo and pretending it never happened. Emotions are obviously complicated. I don’t know what to do or say. The sexual chemistry was off the charts but idk if that’s just because it was unexpected and wrong. Regardless, I cannot stop thinking about it.

Edit: I know this got long and I’m sorry