After Nikolai left when Fyodor died, Dazai and Chuuya (You) left too, Just not with Nikolai. Chuuya complained about how the fangs were too uncomfortable and they were a pain in the ass to get out because of his boss, Mori, glued them on too tight.

“Now, now, Chuuya. You can have a rant about the fangs later.”