>>2855735I Turned Into A Gyaru and Got Fucked By My Best Friend/Kuro-Gyaru ni Natta Kara Shinyu to Yatte Mita has been made into an anime, although the episodes are only 4-5 minutes long. It's technically a gender bender, but it turns into a full blown yaoi down the road and it's pretty good so far IMO as far as yaoi content goes, even though it has hentai scenes in it.
The main character gets chosen in his male form over his female form, which is rare as fuck. I won't post it here though, since it triggers the shit out of some people.
You can find the adult versions online (since they released a toned down version for some fucking reason, you can find it with the Japanese name.
So far episode 2 and 5 have full blown yaoi, frotting and anal fingering/dry orgasm. Shit's hot AF.