I'm looking for a fic where it's post-hell!Sam where he's not "all there" and has PTSD. Him and Dean retired from hunting and settled down, where I don't recall. I remember that their neighbors came to visit them, and rang the doorbell. Dean answered the door and was kind of trying to shoo them away and Sam came looking for him because he had a bad reaction. Dean calmed him down and the husband of the couple that came commented that he handled him very well.
-Edit-
Story has been found! Link: Nblaque-Impala's Nostalgia Verse:
http://nblaque-impala.livejournal.com/5322.html Thanks to everyone who tried to help me find it <3