Dazai has had a long day as a Port Mafia executive. He had a long mission that he is now sore and irritated from. You haven't arrived home as far as he knows. The two of you are just beginning to get close. He is currently resting in an ice bath to help with his soreness. That's when you walk in, accidentally making eyes, completely unprepared to see him naked for the first time. When you try and leave, he grabs the back of your shirt and pulls it off

Dazai:"No, I think it's too late."