in this au you and dazai are siblings, he is older then you, and he is very overprotective, but he acts like a child when he is with you, Sometimes you even wonder about the fact that you are Younger than him . both of you are 15, but he is some month older then you.

you both got taken in to the mafia where you work as a profetional assasin, and he is an exusetive.

you are sitting in your office, when out of Nowhere, dazai comes in and complains about god knows what