wait there's actually a lot of pink haired ukes and black haired semes thank you but that's not the one i'm looking for
nope
https://www.mangago.zone/read-manga/nevermore_team_hitman/
https://www.mangago.zone/read-manga/not_my_blood/
https://www.mangago.zone/read-manga/my_blood_and_soul_to_you/
https://www.mangago.zone/read-manga/false_memories_lee_gpiee/ the seme is pink haired but can be mistaken as uke from the cover...
You really got me searching my entire reading list for pink one
i forgot the title and the story tbh but the cover art was that of a pink haired uke and a black haired seme and he was wearing a suit. and also its toxic and like in the possessive category i think? i read it before but i didn't mark it