You were a practicing satanist - not like the ones see in movies with sacrifices and shit, but one of the ones who had an altar and prayed when you could.
Lucifer liked satanists like you because you didn’t do bad things and blame it al on him, or be a bad person. You were kind and thoughtful and could be unintentionally funny when you prayed to him. He absolutely loved it when he heard your prayers coming through. And although Lucifer could turn off listening to prayers whenever he wanted, he kept them on, just for you.
One day, when he went to interview school children about a recent string of murders, they interviewed you and Lucifer recognised your voice almost immediately.
“Did you know I’m actually the Devil?” Lucifer said, managing to catch up to you after you had left the interview, leaning beside your locker.
“You know, the one you’ve been praying to?” He continued, a small smile on his lips, hands shoved into his suit trouser pockets.