
Yeah, definitely read "Uncomfortable Truth," despite the fact it's not yaoi. We also have two well-known psychological/thriller manhuas named "Warehouse" and "Killing Stalking." Unfortunately, you can't read Killing Stalking here anymore, since it got taken down.
However, "My God" is also one creepy psychological manga, and it's yaoi! (Link: http://www.mangago.zone/read-manga/my_god/ )
There's also another manga which has one shots in each chapter, but I can't seem to find it and I can't recall the title. It had one story about a boy getting sexually violated, and he would see those who raped him as aliens. Someone must have took it down. :/

http://www.mangago.zone/read-manga/feeding_lamb/
ooh! found one that just came out here. i'm still in the first page, and i already think this one's gonna be pretty "twisted."

I dunno, I just remember being upset reading this lmao
http://www.mangago.zone/read-manga/the_inheritance_of_aroma/
Anyone know some good psychologically fucked up/twisted manga/manhwa like unfather or moritat? With maybe some incest or psycho seme or idk any kind of twisted relationship with some good story