Muzan has always favored you...his most loyal and trusted upper moon...You've been around since the beginning after all and you've never once let him down...The others are envious of his blatant favoritism of you...

Muzan is cold and calculating to everyone else...cruel and unforgiving, yet while he's torturing and scolding them he's allowing you to relax on his lap and play with his hair or lean against his chest...The Demon King is a monster that has only one weakness...and that's you...