He wakes up on the side of the road, with no memories except white light and searing pain, wearing ripped jeans and a shirt that looks like its seen better decades. He yells at passing cars until one stops, and the driver-a fat man he instantly hates, wearing a suit and a smarmy smile asks his name.
He doesn't know why, he doesn't even know his name or where he's from for fuck's sake, but he answers immediately.
"Luce, I'm sixteen."
That's apparently enough for the guy, and he climbs in, knowing something will happen.
It does, when the guy reaches for his crotch, and he looks at this disgusting little man before wrapping his hands around that fat throat. The leer turns into a look of panic as he tries and fails to scream, it sends a jolt through Luce, but he knows it needs something more. He grabs the car keys, and the holes, dripping with blood, where the man's eyes were are perfect.
He dumps the body, setting out in the shiny new car, knowing everything but who he is.
Two states over he meets Azazel when the twitchy dealer tries to sell him cocaine. The junkie with yellow eyes is pathetic, the boy genuinely thinks he's more than just a rat. Azazel's obsessed with him though, giving him food and clothes and cash, it's almost pleasant to take a break from stealing. The arrangement stops when Azazel starts demanding things from him, and before Azazel has time to react his head is gone.
He starts conning easy targets, and they're all pitiful and weak. The newest one is Meg, a sad girl so desperate for love that she'll do anything. She gives him everything, her money, her virginity, her soul, before he kills her. It's his first time using fire, and Luce knows he's never heard anything as beautiful as her screams.
He's leaving, after her body burns, when he meets his brothers. It's Gabriel that recognizes him, and his stunned "Lucifer" shifts everything into place.
He remembers teaching Gabriel how to pick locks, he remembers giving Cas books, and he remembers the endless arguments with Michael before he left. He knows they're related, he knows they're family, but Luce can't bring himself to care. Now that he remembers, all he really wants his revenge.
He gets it, cornering Michael coming back from work one night and slamming him to the floor. Lucifer takes his time, flays the skin from his hated brother's back, slowly and precisely breaks and snaps his ribs until they resemble wings. The last, perfect part is the halo he carves into Michael's skin.
He does what he has to, to prevent foolishly noble Cas or vindictive Gabriel from retaliating.
Lucifer knows he will never care for anything except the terror in his prey's eyes and their muffled shrieks as they bleed.