Lucifer is in LA and helping the Chloe, Or as he calls her 'detective'. But Chloe didn't pick him, So he left them and went somewhere else to hang out, somehow landing in New York..

Lucifer started helping the Avengers, but they don't know he's the devil. He met Y/N Stark and hangs out with her more then anyone else, but he refuses to admit he's fallin in love with her.

Y/N has black magic and Lucifer didn't know, then he accidentally showed Y/N his devil face.