mmmm! (i'm the swaped au)
mmm-mmm! (and i love my sister)
mmmmm-mmm-m (You mess with her you mess with me)
mmmmm-m-mmm (that's all buh bye)
mmm....mmmmm (muzan....your days are numbered)

Nezuko:
Inosuke:
Zenitsu:
Shinobu:
Genya:
Kanao:
Rengoku:
(tell me who else do i need to add. i forgot)
Muzan: