please i need your help..

i have ever read a manga. i cant remember at all. but i just remember about the seme has a multiple personality the good side named Kei-san and when the bad side i cant remember.. but the uke has a long hair like uke/sensei in Koisuru Bokun. and i have the picture when i screenshot when i read that mnga. but i cant remember what manga is it.. anybody kno??