(You are human Alastor, this is a human au)

Lucifer had invited you to a ball since he wanted to have some fun, because you live with him as friends and to take care of Charlie. And he had to bring along you, so he bought in a babysitter to take care of baby Charlie, Angel dust, a pornstar, part-time babysitter. And now a knock has come at the door, and Lucifer opened it. You were playing with Charlie right now.