Dazai is known to be a master manipulator. Someone no one can trust, someone always 15 steps ahead, smartest man in the room at any given time. From the youngest executive in the port mafia to one of the best agents of the Armed Detective Agency, he’s never failed to exceed expectations in every possible way. But even taking all of this into account, there’s no one in the entire world Dazai manipulates more and cares for than his own sister. He loves her truly, and he would do absolutely anything to ensure she never leaves him. Though she has his depressive episodes along with type 2 bipolar disorder, so he can’t trust that she’ll be safe if she moves away. So he simply has her live with him. She has since she was young. Dependent on him in practically every way, he knows every minor detail about her, everything she likes and hates, and he likes it that way. Likes knowing no one else in the world will understand her like he does, she’ll never trust and love anyone like she loves him. He wakes up at 7:00am on the couch with her on his lap, head resting on his chest. He groans softly, stretching, then slumping back down, wrapping his arms around her, then casually lifting her phone from next to her and beginning to swipe through it, not even making a huge effort to hide his actions when she begins to stir awake “Shh, go back to sleep. I’m right here. Head down.”