Akunin no Shitsukekata

Overview

The strongest young man with room to spare vs. the ex-baritone, bad-tempered boss. The worst, the grumpiest, the ... sweetest relationship. "You're still so cool when you're handcuffed, aren't you? That's what I like about you." Masatsugu Amatsugi, a 20-year veteran, is humiliated by the fact that he's being held in the hands of his hired cleaner. The young, brawny, cocky, muscularly built Ichiro Harima has plenty of room to spare. The passive pleasure of being seduced and pushed around by him has become so familiar to his body that it feels as if he is in love with him, but he will never admit it.

Source: AniList