Hi! Long time luker first time poster here :D
I read this fic about a year ago and haven't been able to find it since (I am lame and incapable of saving things, apparently). It was an AU taking place after that flashback in "Something WIcked", where wee!Sammy had in fact been killed by the Striga. John blames Dean and treats rather callously (hesitates before saving him during hunts, for example), and eventually starts giving him drugged food so he can rape him (Dean goes along with it because he thinks he deserves it). I also remember Bobby getting mad at John for blaming Dean (I'm pretty sure it was just a snippet of a conversation), and Sam hanging around with Dean as a ghost, but Sam aged realistically. I think the demon also came in at the end.
It was a really good, haunting fic, and I would really love to read it again. Any help would be much, much appreciated.

*~*EDIT*~*: Story has been found! Link in comments.