Muzan-Father

You were a 5-year-old boy when you met Muzan, who took you in and you grew up with him and several demons thinking that it was normal and becoming quite fond of him

It had been 12 years since then, you were 17 years old but Muzan always protected you from anyone who wanted to hurt you and being very overprotective of you, barely letting you leave the fortress

— "You're going to sleep, now."

He said seriously as he took you to your room