I know K Hanna Korossy has written one that's gen. It was where Sam is grabbed by a couple of hunters, they tie him up, drug him, and I'm pretty certain shoot him when he tries to escape them. Dean, needless to say, is VERY unhappy with these fellows when he finds them, and has whole buckets of worry for Sam. Sam has managed to escape at that point, but he's delirious and stumbling through the streets bleeding and Dean has to find him.

Now here's the one catch, I know K Hanna archives her fic over at The Stade, but I don't see it there after skimming for it. It might be one she wrote and was published in a zine this year.

http://www.thestade.com/khksn.html