You've probably heard of Harada, Caste Heaven, and Killing Stalking
http://www.mangago.me/read-manga/heartless/
http://www.mangago.me/read-manga/red_theatre/
http://www.mangago.me/read-manga/venus_ni_seppun/
http://www.mangago.me/read-manga/under_grand_hotel/
http://www.mangago.me/read-manga/tourou_no_ori/
http://www.mangago.me/read-manga/boys_next_door/
http://www.mangago.me/read-manga/samenai_yume/
http://www.mangago.me/read-manga/the_last_lover/
http://www.mangago.me/read-manga/j_no_subete/
http://www.mangago.me/read-manga/sadistic_boy/
http://www.mangago.me/read-manga/yami_bl/
Chapter 1 and 3 http://www.mangago.me/read-manga/bannin/
Chapter 1 and 3 http://www.mangago.me/read-manga/haru_ni_kaeru/
http://www.mangago.me/read-manga/coponicus_no_kokyuu/
http://www.mangago.me/read-manga/kokoro_o_korosu_houhou/
http://www.mangago.me/read-manga/the_inheritance_of_aroma/
BOMB ME WITH DARK YAOI PLOTS PLEASE BE IT RAPE OR TWISTED STUFF BRING IT ONNNN