So I read this story the other day and really liked the way it was written. You may well have already seen it posted on Wincest, but I asked the author if I could link to it here and she said I could.
Title: But a Whimper
Author:
fleshflutter Rating: NC-17
Pairing: Evil!Sam/Dean
Warning: incest, tiny spoiler for All Hell Breaks Loose part one, slightly dubious consent
Feedback: At the Author's LJ please
He refuses to move. That's something his dad taught him: when you're out of ammo and need to survive, keep real still and it might leave you alone. It's instinct now.