There was a recent request for multi-personalities and it made me want to reread a certain insane Sam fic. I'm looking for the fic where Jess lives and goes on the road with the boys but Sam acts schizo because of the YED and thinks Jess is not real.

If there are any other fics where Sam (or Dean) acts crazy a la River from Firefly, please recommend those too!

ETA: Found! The Crow on the Cradle by kroki_refur