Supernatural is one of those shows that just attracts everyone.
I mean, you come for the hot guys and stay for the story. Or vice versa, haha.
There's just something lovable about a show that never seems to take itself seriously. With no thought, they tear down the fourth wall, spoof other TV shows and monster movies, and even show the most obsessive sorts of fans.
I haven't seen all of the show --I'm still stranded somewhere in season four, I think-- but let's just say Eric Kripke is a genius.
Of course, as the fan-girl I am, this means fan-fictions and AUs!
Seraphim Universe which centers around Mercy Matthews and her interactions with the Winchester boys.
Wake Up Call (Dean Winchester/Castiel) When Lucifer abducts and tortures Castiel, the boys aren't sure they'll see him again. Sam has a vision that leads them to Cas --but Cas isn't quite the same anymore...