Show Me How To Love (And I’ll Show You How To Live) - slutpunk (LJ link)

Word Count: ~28,000 Rating: NC-17

Summary:  Dean's broken and he's 95% sure he's always been broken. He's a Fed because he used to believe it would do some good and now? He's not so sure. Castiel knows he's broken and he can't be fixed. He does as he's told, kills who his uncle tells him to kill, and pretends that the nightmares don't wake him up anymore. But they find some solace, some peace in each other, until the day it all comes crashing down.