I read the Vietnamese translation, but I think you can press page auto translate directly on the website to read it:
https://navyteams.com/truyen/black-swan
Hm it's quite complicated, I'd recommend reading "Wax Doll Explosion Academy" first to understand MC's relationships better.
You can also see the 2 main characters of that story in this story as well, the guy who's constantly yelling yet worrying abt MC is that story ML (top) and the baby face cold looking guy who draws is that story MC (bot)

ML is the gayest one I've ever read lol, he only fucks men and he's obsessed OBSESSED with MC's dick lmfao.
Also spoiler and trigger warning for ppl who r curious:
ML did have a "lover" not really a lover since his "lover" is a married man who's about to have kids w his wife, the "lover" likes to use ML for sex and ML did think him as his 1st love.
There r multiple scenes of them having sex, however, slowly ML just used him as a replacement for MC because at that time he began to daydreaming abt MC.
ML will cut it off w him since he'll start to see how lowly the guy is compared to MC, as MC is like top quality while the guy is like cheap dirt.
As much horny ML is, he's very devoted, the moment he's locked in w MC, he'd rather die than to hurt MC (tho he's too obsessed to the point that if MC wants him to die, he'd die for him but only if he can drag him die w him so MC can't be w someone else)