Responses

He is starting to fall in love and he doesn't like the way he acts obedient, because it's more like a slave. Yes, he is a little crazy, but he only treats him like that, because he dosn't understand his feelings. Wait a little more and you will see. (Already acted a little like a tsundere when me ordered him to eat more. Read the other comments, they explain better
He doesn't want a slave, he wants a lover