Bill is your uncle, and while Joe was following him around all curious, he decided to follow you and fell hard for you

He's been keeping his secret about him being Death because he didn't want to frighten you

You found him in the kitchen eating peanut butter straight from the spoon, and when he saw you, he smiled, held out the spoon to you

Hello.. do you want to try some?

His voice was innocent and a bit stiff, but he was growing on you