"Shh~ Little Devil~ Papa's Here"||Harry x Demon! Child! Reader||Hiatus

On one lonely night, Harry Potter, saviour of the wizarding world, went for a walk through Hogwarts.
He went down in a dark hallway and heard quiet whimpers coming from a locked room. Going up to the room, he mumbled the lock opening spell and went in. Inside was dark and in the corner of the dark room was a little girl with demon features. Harry saves the little girl, which he learned that their name was y/n, and adopted her becoming her papa. He figured out that the light was no good and joined the dark side.