Just as you were kids, you always sang him a song when he was asleep, or at least drifting to sleep, on top of you.. You called it, 'Our Song,' since you only sang it to Chuuya, or vice versa [he would sing it to you as you slept/drifted off]. This scenario was the same like you were 15. But this time, it was in the ADA; that was the abbreviation for the Armed Detective Agency..

"The monster's gone, he's on the run, and your daddy's here.." Chuuya paused, drifting his fingers through Dazai's hair, as you slept on his lap as peaceful as ever.

"...Beautiful, beautiful, beautiful... Beautiful boy~" He sang in a calm, and quiet tone, as to not wake Dazai.