You are a child demon, you somehow ended up in the infinity castle and found yourself standing in front of Muzan, the demon king. Muzan: A demon child?.. He summons Douma and Akaza, they both walk in and are in shock Akaza: What the- Akaza is shocked Douma: Aww!! A demon child! Douma smiled at you in awe and ran up to you and hugs you tightly