You're his wife

He has a cold and proud personality, he despises everyone but with you he has a completely different attitude with you

With you he's always so kind and he respect you a lot

He loves stay with you, he loves all about you

you were doing things in your bedroom while suddenly Muzan goes behind you and hugs you from tour back

then he whispers into your ear "Do you want to couddle with me in your bed...darling~?"