This is another kind of post that wouldn't fly in r/incest. And for a public but quarantined subreddit I fully understand. Anything that crosses the line with non consent or putting unwilling people in sexual situations is a hard no.

But just for reddit purposes. Nobody here was uncomfortable or taken advantage of.

This was years ago. I was maybe 19. One of my best friends at the time was a gorgeous woman that I met during my summer job in high school. We'd already been physical by this point so me touching her or kissing her wasn't that uncommon. Naturally I am very introverted and only really want to hang out with those I am close with. So when I say that I've gotten physical with a lot of my friends, that isn't some crazy number. And that only applies to close friends. I'm not giving oral to acquaintances.

I was on a post graduation trip with my friend and her brother. We'd already graduated but her brother(18 at the time) had just graduated. She has a really close relationship with her brother. This was in the past so we were riding around in a van and sleeping in the back on a pile of blankets to provide some sort of cushion. In retrospect the trip was poorly planned out. The van broke down a lot and we ended up in some shady areas and situations. We just had a van and a map.

While nothing incestuous happened with the siblings. I did find their close relationship to be... odd. Not in a judgemental way, obviously I don't care and would find it hot. But they were just always really close. They kisses on the mouth to greet each other. Not a long lingering one and it wasn't cultural to them it's just something they did. I heard them make comments about each other's bodies and they had no issue at all with nudity around each other. They'd change around each other. I always knew incest was my thing so I always tried to remove my horny thoughts from situations and just look at the facts and make no assumptions. Because sometimes I'll see two sisters out holding hands and looking at each other giggling and it looks romantic to me. But I know I'm the odd one so I shut it down. This was never confirmed.

During this trip I got physical with my friend a lot. Her brother was aware of our FWB situation so he wasn't shocked to see me tongue kissing his sister or tapping her butt. I never went beyond that. We'd drop him off somewhere and go hook up in the van for an hour and pick him up. And if he needed it for any women he picked up we gave him the space.

Every night we slept in the back. I was on the end by the seats, she was in the middle, and the brother was by the back. We had been smoking a lot of weed that day and that always made her really horny and touchy. The start of our physical relationship was because of weed. Her brother was "asleep" and she turned to me and said she was horny and needed to get off. She said, "You want to leave or do something here?" And I was like, "Here with your brother?" And she looked nervous like she was ashamed she brought it up. But I didn't want her to feel bad about it because she was a friend so I just said, "Okay."

I started fingering her, kissing her, and all the things I'd usually do to make her cum. I was excited knowing her brother was over there just "asleep" but I didn't want to be weird about it. But I was very aware of everything: his chest moving as he breathed, little arm motions, and just anything. Eventually my friend rolled over and faced her brother and I got closer and put my leg over her leg and spooned her. She was looking at her brother. First I thought she was wanting to check if he was awake but eventually I realized it was getting her off. I'm not sure if this was an incest thing or an exhibitionist thing. Or maybe she likes the feeling of almost getting caught. I can't be sure.

She was really quite wet and it was more than usual. Her thighs were shaking and she was moaning and whimpering. It was like every nerve on her body was more sensitive than usual. I'd kiss her neck and she'd gasp and moan. Realizing it was getting her off I started feeding into it like, "He could wake up whenever." What if he wakes up right as you cum." I was getting pretty raunchy with it and said that it smelt like wet pussy in the van and if he wakes up at all in the night he'd know something. She was quite soaked. We she has a towel under her but she was wet into the sheet we were on. She came while looking at her brother. Our sexual relationship was normal but I guess looking back I was the more dominant one. After she came I put my fingers in front of her face and told her to taste herself and she always listened.

The next day when I was alone with her brother at a diner he opened up and told me that he heard what we were doing but not to tell his sister. He didn't want to ruin the trip or make her feel uncomfortable. He was always good to her and taking putting her feelings first. He was a year younger but sort of was more sensible and behaved like the older sibling. He was the one that worked on the van when it broke down and navigated with the map. We would have definitely been still stranded to this day without him. But he didn't give his opinion on it. He just said "if you want alone time you can just wake me up." And asked me again to not tell her about it and that he didn't want to embarrass her.