its a kink that is both sexual but some people implement it into their everyday lives. basically like a master/servant relationship where one has control over the other to different degrees.
thats a really watered down explanation lmao its a bit more complicated but thats the gist
you guys are sad about his hair being cut off but baby his long hair was/is a sign of neglect. he has been in that room since he was a little boy with no knowledge of how to do anything, mujin cutting it off is lowkey his first sign of care ever in his life.
bro his dick is so ridiculous