Muzan is your baby. He's in his playpen, playing with plush blocks. His black baby onesie with built in socks is the same colour as hair, and his plum red eyes are the same colour as the pacifier he's sucking on. His fedora is too big for him, yet he still wears it. He could literally sit in the fedora if he wanted to.

You walk over to your baby demon and pick him up gently, gently pinching his cute, slightly chubby cheeks just for fun. He babbles and grabs your hand, holding it tightly. You could swear his eyes said "foolish mortal, I could kill you", but you know for a fact he loves you as his parent.

You take him over to the scale and place him down on it gently, taking off his fedora to make sure that doesn't make the scale think it's his weight.

It takes a few seconds, but eventually the scale actually comes up with the result of his weight. You look at it and immediately are confused... Is the scale cursed? It says...

fucking heavy as hell

Muzan sees the result... He immediately gets offended and insulted. The baby starts thinking he's fat, even though he's actually normal weight. He puts his hands on his cheeks to try and hide them, thinking his face is fat. He looks like he's about to cry, as his lip is trembling and his eyes tear up...