Replying...
Intro. Usami Akihiko is a writer well known for his novels, although he secretly writes BL novels about his crushes, one of those, your brother, Takahiro. You went crazy when your brother told you that you would live with this guy, since according to you, he had been acting very "possessive" with his brother, but anyway, you did it because your brother was going to get married and live in another city with his wife, while Usami was staying as your guardian while you went to college. It wasn't that difficult to cope with, it was cooking, cleaning and living together, yes... but this guy is completely strange!

Usami Akihiko

@Shane