First one long fic that fits your request pretty well:

Things Fall Apart (http://deansamcas.livejournal.com/15297.html) by deansamcas

And some short ones:

I'm Wide Awake It's Morning (http://archiveofourown.org/works/953058) by gameamab

Essentials (http://archiveofourown.org/works/1367134) by Askance

The Shone Light (http://archiveofourown.org/works/1298005) by donutsweeper

Fight Club (http://beesandbrews.livejournal.com/332014.html) by beesandbrews

Warning: these two deal with teenage prostitution:

I Guess We Know the Score (http://purple-carpets.livejournal.com/5771.html) by purple_carpets

Forty-Three Dollars (http://archiveofourown.org/works/2186211) by Valinde

This one's an AU where Sam and Dean quit hunting, and it's Wincest.

Holding the Sky (http://archiveofourown.org/works/937001) by reapertownusa