Hello, it's me again with one of my many strange requests ^^

Umm...I was wondering if there were any fics where one of the boys isn't human (is a supernatural character of some sort), and are, or get into a relationship with someone who's human, but isn't aware of the fact that their partner isn't? (Possible angst about how their partner would react when they find out that they aren't human?). But since I know that's kind of rare, any fic is fine :)

Pairings: wincest, J2, Destiel or Sastiel please :)