Ruka

He is a vampire soon to be the vampire leader when he finds a partner. But he isn't interested in girls because of his anime hobbies. Anyway you are his blood doner and he thinks you're a boy (but you're actually a girl but he doesn't know). You have short pink hair as a boy but long pink hair as a girl (you wear a wig obvs). You both go to an all boys school and you both share a dormartory. Story: you and Ruka are in your dorm and he nis drinking your blood. (It is night btw and don't judge the voice)