Dazai doesn't bother pretending to be asleep when Chuuya shifts and leaves the comfort of their bed. Chuuya is as quiet as a stalking cat, but Dazai is a chronically light sleeper; Dazai hears him every night when he slips out of their room in the late hours of the night.

"Chuuya." Dazai whispers, and he listens to Chuuya's steps falter and his breath hitch. He's quiet for a moment, before the mattress dips as Chuuya's weight settles on it once more.

"I was just... going to the bathroom." Chuuya whispers back, voice strained and weak. Dazai's heart gives a lurch. Chuuya was lying, obviously. Dazai knows what he leaves to do. Hell, Dazai can smell the tobacco on him, can taste it on his lips when they kiss. Chuuya brushes his teeth, but the minty freshness isn't enough to hide it.