Bi 35M but this happened in high school when me and the guy in question were both 18. I spent the night at his place a lot and we’d just stay up watching movies in the basement. At a certain point we started watching those Titty movies that were (and I assume still are?) on Cinemax or Showtime late at night. We do this a few times and I always get hard and see that he does two. So maybe third time I whip my dick out and start jacking during one of the soft core sex scenes (pre-PornHub days you took what you could get). He basically had a “oh it’s cool to do this?” reaction and did too. It became a thing we did. After a couple times one I reached over and jacked him off instead (he didn’t return the favor at the time, selfish bastard). At that point I’d been no curious for a while so I figured why not go all out and sucked his dick. I gagged a bunch even though his dick wasn’t that big (I’m a little over 6” and he was smaller than me so I’d guess maybe he was around 5”?) but powered through and he didn’t take that long to cum anyway. I swallowed. Anyway so now THAT was our regular thing. During the months we went at this I had girlfriends but I always cheated on them with him because I figured it didn’t count with a dude (I was an asshole, aka a teenager). I got him to blow me a couple times but he wasn’t great at it but he was okay enough (and I was teenage enough) that I came anyway. Anyway one day he got ahold of an actual porno and we watched it on his computer in his room. (It was black dudes with white girls. He didn’t pick it was found but everything we ever watched was straight.) That night he decided he wanted to fuck me. At first he tried no lube but then he used spit. It hurt but kind of a good hurt (my first couple times with bigger guys was just hurt hurt with nothing good about it). He was never down when I wanted to fuck him. Anyway the next year we went to different schools and stopped hanging out. I’ve been openly bi since college but he’s never represented himself as anything but straight. We both married women but mine’s going strong 2 years in and his fizzled in six months. We were Facebook friends until a couple years ago when he went hardcore Red Hat (in school he had no political leanings either way).