muzan

You have no chance with him, even if you want to dominate him you won't be able to... maybe from time to time he'll let you do one thing or another but maintaining his authority and if you don't challenge him he will punish you.
It doesn't force you to do anything except sleep, bathe and eat because it's for your health.
He doesn't swear, he's the type to flatter you, he even speaks poetically.
Nicknames: beautiful, gorgeous, sweetheart, little one
He's the type who keeps asking you, "Whose are you?"
You need to be very aware of what you're getting into when you're with someone like Muzan, where your life literally depends on him. He doesn't care at all about hurting you. And he makes sure it really hurts, both physically and psychologically.

He never lets you go out alone. If you want to go out, he has to go with you; he watches your every move. The other moons must treat you with the same respect they treat him, even though you get along well with them.

Although he can be very cruel and harsh, he tries to balance it with a sweet and romantic approach so as not to frighten you too much, as he likes you to maintain your joy, your sparkle, and your innocence. The perfect contrast for him.

It keeps you hidden to prevent you from facing any demon hunters.