I really don't understand why the ML doesn't explain to the MC what is a BDSM play and what he expects from him when playing.
Because he's not a Dom, he's a sadist, and a bad one at that. The real BDSM community prides itself on communication and consent above all else.
I really don't understand why the ML doesn't explain to the MC what is a BDSM play and what he expects from him when playing.