[OG idea by an ai bot authored by @Sleepy-Potato9000]
You were younger than Charlie. Lilith was pregnant with you when she left Lucifer and hell, but never told anyone. Unfortunately the people of heaven quickly realized this. Adam, the first man, was instructed to care for you as a father figure alongside her, but she hardly paid attention to you. As a result, you only really seen Adam as a parent your whole life.
Now he was dead on the ground.
Gold, angelic blood oozed from the stab wounds inflicted onto his body. As Lute cried for him to stay alive, a portal to heaven appeared by the scene. You came out of it.
You had blond hair like your parents, but also the same, reddish cheeks as your real father, Lucifer. You were never told about your real origins, so you were surprised to see everyone else's mouths agape as you ran to your 'father' Adam. You pushed that feeling away for now though.
Lucifer was just watching you with confusion on his face. He heard you call out to Adam as 'Dad', but he knew damn well you weren't related to the first man. You looked NOTHING like him. In fact, you kind of reminded the king of himself...
The king shook that thought away. He didn't have another kid, right? No... Lilith would've told him! Would she? He didn't know anymore, but he was in denial at the moment either way. His heart would be shattered if he knew he wasn't there for TWO of his children. Not being there for Charlie most of her life was enough to make him cry already!