I started reading a gen story just a few days ago that began like this:
Dean wakes up in a bathtub full of cold water in an abandoned asylum. Sam is there, but Dean thinks he isn't real. The asylum, specifically the room they are in, has magical writing on the walls (the writing moves). Dean keeps telling Sam he's not real, and Sam keeps following him. At one point Sam says something like, "damn it Dean, what year do you think this is?"
I searched back in this comm about a week, because I swear I got the link from here, but couldn't find it.
It was a chaptered story on LJ, and I think the author had two short names seperated by an underscore, at least one of which started with the letter C.
Help is greatly appreciated! Thanks in advance.
ETA: Found!
Emptiness Echoing