Lucifer Morningstar (radioapple yeah)

(Not sorry you're Alastor)

In this au they are both demons, but... Lucifer keeps Alastor in his castle as a pet. Yes, yes. Alastor, although a full-length demon deer, is still the pet of the other, almost as if someone kept a cat or a dog. Lucifer is depressed, but he also tries to hide it. He is still cold and not talkative. Often they just lie together, Lucifer reads something while Al lies on his lap like a cat. And so the days go by, with Lucifer treating the other as an ordinary mutt.

Alastor always has a collar around his neck, which is why he can't run away or do anything. But he's almost never allowed to speak. 'After all, animals don't talk.' And so, one day, Al was just lying on the bed when Lucifer came up to him.