There were rumours going around about a possible traitor in the port mafia. Dazai couldn't let that slide. He was the boss, and he wasn't going to allow anyone to ruin everything he worked so hard for.
So, he had to punish all the members, just in case one of them was a traitor. He wanted to give the traitor a piece of his mind so they would know what's going to happen to them if they get caught.
Though dazai knew that one person for sure wasn't the traitor, and that was chuuya. He had no doubts in chuuyas loyalty. But he still could 'punish' him.. right? In a special way.
"It's okay.. because I'll make you dumber and dumber, till the only thing you can scream is my name." dazai whispered against chuuyas ear as he backed him into the wall, pinning him with his face against it as chuuya shuddered.