Its gonna be a very confusing description but im gonna try. So its a side story that is focused on more near the end i think and the top had silver or white hair and was taken care of by his crush when he was a little kid and when his crush was a young adult or teen and the bottom had black hair and they reject the top like alot but in the end get together
https://www.mangago.zone/read-manga/my_darling_is_a_foreign_crybaby_official/
I don't think this is it, but the character description is similar if you want to try
Its a prostitute that works with a detective to figure out information about the prostitutes boss and what drugs he sells and the detective comes to see him like every week
https://www.mangago.zone/read-manga/sharpe_and_ rabbit/
https://www.mangago.zone/read-manga/double_hound/
Was it one of those two perhaps?
I’m looking for really messed up manga, like one of the characters is crazy or something or etc. also preferably yaoi but I don’t care
Yes Kafka, yes.
Also, I've got this, but I warn you this is mentally draining manga because it has messed up characters and circumstances.
I've been waiting to recommend these for so long because I need others to suffer with me:
*Psycho by K.S. Sihai; it earned its name, mentally draining but horrifically artistic. A scary beautiful. Yaoi. Keep it fiction.
*Future Diary(Mirai Nikki) by Sakae Esuno; famous for the anime, infamous for pink haired yonder girl, psychologically draining and retch worthy. Hetero.
*Killing Stalking by Koogi; infamous on this site for a while so you might have already read it, you'll time for recovery. Bleach and holy water too. Keep it fiction. Yaoi.
*Stalker's Game by Tan; great for psychology majors to sink into, keep it fiction. Morbidly fascinating. Yaoi.
*Ex vs Stalker by 양욱; if you had this option, you should just run. Creepy interesting. Hetero.
*It's Mine by LuckS; a Webtoon you will become obsessed with and beg for coins. Hetero.
*Lost in Translation by Jjolee; another Webtoon worth your heart and tears. No romance focus but has Hetero couples. The softest and most wholesome on this list.
*Last Seven Days by Hitsuji Hitsujima; a melancholically endearing work that becomes more tragic and disgusting as anything they can think of as sodomy becomes their only hope. Yaoi.
*Naka no Hito Genome by Osora; the tamest on the entire list, right below Lost in Translation. Very adorable, gradually disturbing.
The top has short sliver/white hair and the bottom has short black hair the top has had a crush on the bottom since he was toung and i think intoroduced to him by the main character? I dont rlly temember but its side story character in a popular manga i read a long time ago i cant find it