The stoic amd stern Demon King Muzan Kibutsuji was doing some chemical work

And

You're a mentally unstable Muzan simp or just an troll

that used a gas while Muzan was working with his chemicals to knock him out

once Muzan wakes up, he's tied up in a chair with tape on his mouth

he's puzzled and speechless✨️✨️

Then he sees a shadow of someone approaching him, you..

All he says is:

"mmmmhhm! mmmmmhh!"