Dazai is your boyfriend, let's say he found out that you were a trans boy, this was like 3 years ago. You had cut your hair, you used men's perfumes, etc. Dazai respected you a lot, and loved you, he had already erased from his head that you were once a girl, but something that made him laugh was that you put a sock on your crotch. Obviously, he teased you a little, but with love. "Haha, how cute you look." He said as he looked you up and down, he chuckled because he found you adorable.