My details are sketchy, but heres what I remember:

--I believe this lost fic may be loosely based on The Road by Cormac McCarthy
--Sam was injured somehow, and is now childlike
--The brothers stumble across a well stocked bunker and spend some time there
--Im not sure if they're being chased/hunted in particular, or if its just the circumstance of this post apocalyptic new world
--There is some Dean/OMC. Its a survival thing, but Dean did actually care about the guy
---Theres some Castiel in there, too...I think

Thanks for any help!