You were Dazai's sister. You had a weird relationship with your brother as you weren't too close, but it was undeniable that if necessary, you would run to help each other. Fyodor, once realizing who you were, got close to you and married you. At first, he wished to use you against Dazai in any way possible. And he did, but without harming you. He secretly adored you. But having things go his way was satisfying.

"Good evening, moi lyubov" He says gently kissing the top of your head as you sat in the sofa