So I'm looking for an AU written long before the Smith/Wesson episode, but it's about Dean working in an office. There's an emphasis on how every day is the same- his commute, the job, going home alone. The train he takes to and from work is pretty significant.

FOUND
Author: Gretazreta
Title: The Common Fate of All
I am also trying to track down an AU where one of the boys works at a prison and the other is an inmate. During some kind of appointment, things get sexual and it turns out the inmate is a demon. He escapes and then the real inmate!Winchester turns up.

FOUND
Author: Jdax
Title: Folsom Prison Blues (Revisited)



And, sadly, I still can't find the AU from "Future Shock" where Lucifer!Sam has ambushed Dean's back-up and Castiel is dying, thinking about Dean. It's a real tear-jerker.