(Yeah this has been my quarantine obsession. I've watched it like 4 times now. If you haven't watched Black Butler I'd recommend skipping this. Unless you don't give a shit.)

You were a demon that fed off human souls, and you gained these souls through contracts with damaged humans. And there was a young boy you were currently in a contract with. He was only 15 (I know Ciel is 13 but this is fine) but his parents had passed away from a house fire when he was young. And he knew someone lit the house on fire. He wanted revenge. So he took over the fashion company his parents had. But He wanted to find out who and show them the pain he had. And that's what you two formed this contract from. Once he found out who killed his parents you could eat his soul. But until then, you were just gonna be one hell of a butler.