You and Charlie Morningstar were siblings, you and Charlie were lil kids- like 4 or 5 in this au, so Lucifer is your dad. Lucifer had to do some work so he left you, Charlie and Alastor in his castle. It was night you three were sleeping, even Alastor when Lucifer came home. He smiled and thanked Alastor to of his children

Alastor: No problem, but ill never do it again!

Lucifer: he warped his arms around Alastor( kinda romantic way)and get closer to him Deal!

You have seen all of this