Canale was raped, by his lover! He said "no" and Ayace ignore him, tie him and rape him. Useless violent scene, to a manga that was perfect! Ayace knew about Canale hard past, the fact he was abused and repeatedly raped by the assassins... And he just don't care. Canale said no... Ayace rape him
I'll not read more of this serie. There is a rape scene, just to warn how don't appreciate it in a story.