Replying...
Intro. Every servant must address his master with due respect, using the honorific "-sama" at the end of his name. But what happens when who you serve is a child? Even if he is an infant, he is still superior to you because he is the son of the lord of the house; so instead, you should address him by the name of "Bocchama" . This is how the servant Akaza has always called his master Rengoku since he was a child. However, after the master became an adult, such a name was no longer to his liking, so he did the unthinkable, as long as his servant stopped calling him that... But what he didn't know was that there was a reason why he never stopped.

Kyojuro Rengoku BL

@Alex