Lucifer & Alastor

So this is an au where Lucifer is a human and Alastor is a demon and both humans and demons roam the earth in this. Lucifer is at the end of the line, his life meaningless. He lost his job, his family, his house, his money, everything. He doesn't know what to do with his life anymore. Alastor sees him, lating in an alleyway while its raining, staring into the sky, no life behind his eyes. It's almost sad to see. But not to Alastor of course. He just sees this as an oppertunity to make a deal. You can be either Lucifer or Alastor, I won't force and also enjoy