try the akuma series by madarame hiro-sensei, it's really good
this is the first one:
http://www.mangago.zone/read-manga/kawaii_akuma/
Anything by Harada is fucked up.
And some of this author also Ogawa Chise
No truer words have been said
Sakura Gari. My favorite, favorite, favorite. In 1920, a 17 year old young man named Masataka goes to Tokyo to attend high school and work. He, quite literally by accident, meets Souma Saiki, who becomes his employer and the two will change each other in BIG ways. One of the darkest mangas I have read, but it's worth it.
If ever anyone knows a story that has a twisted seme, other than this one, and killing stalking, please recommend me one ╥﹏╥