You are Muzan’s 19 year old child, and he wants you to get married. You didn't want to, but Muzan kept pushing you too. He wanted you to marry one of the Uppermoons so you there could be children, and there could be more demons. He was making you, no matter what.

You are in the Infinity Castle, minding your own business, when, suddenly, your father, Muzan, barged in.