Alright, I'll bite. When I was 16, my older sister's boyfriend was staying over for the night. No parents home or anything, they had gone traveling for a day or two to see a concert. So anyway, you can see where that was going. Sister had noisy sex with the dude in her room while I sat downstairs playing vidya to get away from the noise. Anyway, at one point he comes down with her, and she's looking kinda weirded out, and he starts talking to me. Just asking innocuous shit, like what I was playing, while I replied in that distant, half-answer mood you get when you're trying to concentrate on the game. He sits down on the couch, and I see out of the corner of my eye that he just has this massive boner tent-poling in his pants. And he's looking at me, not like he's just trying to get a laugh out of my sister, like he's eyeing ME the way he eyed her all the time. His expression says it all: he wants to fuck me too!

So anyway, I'm uncomfortable but try to hide it, not showing that I had noticed his pocket rocket. Because how the hell do you react when a guy is not-so-subtly trying to get with his girlfriend's younger brother? And then I started thinking, y'know, the dude's actually pretty attractive, and not in that "As a guy I acknowledge that that other guy is physically attractive" way, like I was getting a little gay in my thoughts too. But I just push that away. Eventually he gives up and goes back upstairs, where I hear frantic whispering between him and my sister, as apparently she had only JUST NOW thought "hey, it's pretty weird that my boyfriend tried to screw my underage brother", and that's the end of it. No acknowledgement of that ever happening since then from anyone involved. Also the only time I've had pretty gay thoughts about another guy.