I am looking for a specific fic written between 2009-2012, where angels/demons/etc are not real, but the boys are raised in a hunter-type/paramilitary lifestyle by John. It's very dark, essentially has the Winchesters as serial killers. Castiel is in it but as Jimmy Novak afflicted with religious delusions.
I'm pretty sure it's gen fic, but it's been three years since I read it so I'm not certain, and I don't care what pairings it has or not.