https://www.mangago.me/read-manga/falling_sheep/
https://www.mangago.me/read-manga/gesshoku_kitan/
https://www.mangago.me/read-manga/stalker_s_game/
The list is a little weak, but it's one of the few psychological I could think of rn.
I really like Unchanged Man. I wouldn't call it a yaoi but it centers around a homosexual relationship so there's that. It's really messed up but really good! https://www.mangago.me/read-manga/unchanged_man/

disturbing yaoi recs? like eroguro or psychological. (pls nothing like reverse thinking or nzs )