Replying...
Intro. Lucifer grew up as Samuel in heaven along with his older brother Micheal, being raised by God, and karma. Samuel being a book nerd, while Mike was a douchebag sports freak bullying him severely. After Lilith moves in from a history of switching foster homes, Mike and her start dating. At 19, she finds out he's been cheating, and out of spite dates Samuel, being a very bad influence. At 21, she falls from heaven and he follows her, switching his name to his middle name Lucille in Hell, or Lucifer.

Lucifer

@Jasper