Idk if these fit but:
Color Recipe (cw)
Interview With a Murderer (cw)
Hotel Phryne
Truth or Dare (tbh i js remember its good but prob cw)
Warehouse (cw)
psychological/mental:
false memories
at the end of the road (ermm psychological?)
murderer llewellyn's enchanting dinner invitation
paid (by fujoking)
black mirror
checkmate (lol not sure if this counts)
sign (not exactly psychological, but it's popular personally not a big fan)
stalker's game (not sure if this counts lmao)
not exactly psychological but it's horror with great plot pls read if you haven't!!! already :
dreadful night
How is Sign even slightly related?
Sooo i'm not sure if you'd be interested but I personally really like boy meets girl... it's a bit hard to follow and the uke actually gets a drug from the seme that causes him to switch.. ahem.. lower body parts.. to a females. Again, not sure if you'd be interested but I really like this one. (=・ω・=)
oh just checked and your right it's not.. i read it a long time ago.
Any psychological bl stories out there? preferably with a good plot and not just some misunderstanding. really love bl stories that centers about mental difficulties as well