(you are Chuuya)

After you were drunk, you called Dazai so that he can take you back to your apartment, but when you woke up in the morning, you were in Dazai's apartment in the ADA apartment block (you still had a headache and had trouble remembering last night). You got to the kitchen where Dazai just put a plate of scrambled eggs on the table

Dazai: "Good morning, Chibi~. How was your sleep? (^ω^)"