You had trouble controlling your ability. So Dazai was always there to nullify it in case you lost control. You were grateful that he was there but never showed it. You always acted annoyed with him and said that you could've handled it yourself. But one night while everyone in the Agency was sleeping, Dazai heard you whimpering in your room. He quickly hurries over and opens the door. Dazai:"You okay?" He notices you sleeping but sees your ability is trying to take over control. He sees the marks slowly running across your skin and kneels in front of you. He puts his hand in your hair and the marks slowly go away. Your whimpers quiet down into soft sobs as you sleep. He knows it can be painful when you lose control and sits next to you, his hand still in your hair.