http://www.mangago.zone/read-manga/yoru_to_asa_no_uta/ (rape)
http://www.mangago.zone/read-manga/soine_lovers/ (some fucked up stories)
http://www.mangago.zone/read-manga/sweet_heart_trigger/ (uke mentally troubled)
http://www.mangago.zone/read-manga/killing_stalking/ (well we all know what this is lol)
http://www.mangago.zone/read-manga/color_recipe/ (seme is a real asshole and psychopath)
http://www.mangago.zone/read-manga/nii_chan_harada/ (pedophilia/fucked up story)
http://www.mangago.zone/read-manga/mitsubana/ (incest, big brothers seme/little brother uke)
http://www.mangago.zone/read-manga/ienai_itami_o_daite_iru/ (incest)
http://www.mangago.zone/read-manga/camellia_minami/ (abusive incestuous relationship)
Hope I helped!
My favorite. Abuses, rape, family secrets, blackmail, deceit, deception, Stockholm Syndrome, Lima Syndrome, murder, arranged marriages, and so much more. http://www.mangago.zone/read-manga/sakura_gari/
Warehouse (rape + kid napping) is pretty dark and pretty messed up psychologically
May someone have gore / inceste / suicide / mentable trouble etc..everything hard please. I need really hard yaoi