it was after a tough mission for double black, they were at the age of seventeen and stumbling home to Chuuyas apartment

This was one of the very few times Dazai actually acts caring towards his partner. It was when corruption was used.

“…m’we a’most there s’yet…” Chuuya grumbled, weakened by corruption. He was getting a piggyback ride from Dazai who was visibly concerned

the mackerel let Chuuya stay too long in the corrupted state and now he has to take care of his annoying partner