Aku Yori Aku

Masaki is a pitiful and inexperienced succubus. Down on his luck and starving, he ends up in the house of Akihito Shimizu, who Masaki begs to have sex with him. Although he does not admit to being gay, Shimizu readily agrees to the arrangement. Despite his apparent act of kindness, Shimizu would not describe himself as human—in any sense of the word.