story idea

i have this idea for a short story - this old farmer guy and his hound dog stumbles upon a freaky satanist doing a ritual in the middle of the woods, the satanist threatens the farmer and attacks him, and in the struggle, the farmer blasts the guy

and kills him.  Afterward he notices in the middle of a drawn on the ground pentagram, there's two little baby demonic creatures. He takes them home with him and feeds them meat and stuff and they are pretty crazy and destructive but sorta affectionate towards him and sleep curled up next to the hound dog.

Anyways, it turns out the satanist guy was literally the anti-christ, and the two demonlings are new-born world destroyers meant to help him end the world but instead they just end up obnoxious pets of an old farmer.