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This classic tale of a serial killer and a male prostitute http://www.mangago.me/read-manga/boys_next_door/
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seme has mental probl. but it turns out when the story goes on (first it just seems typ. yandere) http://www.mangago.me/read-manga/hanazono_no_kioku/
split personality (uke has a hard life lol) funny read
http://www.mangago.me/read-manga/kokoro_logic/
is there any yaoi with a really fucked up seme/uke (maybe a psychopath, or really crazy person) who actually ended up dating the uke/seme?