Don't know if you're still looking, but DSOTM (the Flagstaff incident), I would recommend the following: Nongpradu's Flagstaff http://nong-pradu.livejournal.com/15796.html (http://nong-pradu.livejournal.com/15796.html)
And writewanderlust's In locos parentis http://writewanderlust.livejournal.com/6539.html (http://writewanderlust.livejournal.com/6539.html)
For general stories where Sam realises what Dean's been through when younger, there's the excellent & classic 'Red' by BigPink (long-fic) http://big-pink.livejournal.com/16952.html (http://big-pink.livejournal.com/16952.html)
A story where Sam finds out exactly why it is Dean hates rats so much http://www.fanfiction.net/s/5670602/1/Mus-Maximus (http://www.fanfiction.net/s/5670602/1/Mus-Maximus)
no subject
Nongpradu's Flagstaff http://nong-pradu.livejournal.com/15796.html (http://nong-pradu.livejournal.com/15796.html)
And writewanderlust's In locos parentis http://writewanderlust.livejournal.com/6539.html (http://writewanderlust.livejournal.com/6539.html)
For general stories where Sam realises what Dean's been through when younger, there's the excellent & classic 'Red' by BigPink (long-fic) http://big-pink.livejournal.com/16952.html (http://big-pink.livejournal.com/16952.html)
A story where Sam finds out exactly why it is Dean hates rats so much http://www.fanfiction.net/s/5670602/1/Mus-Maximus (http://www.fanfiction.net/s/5670602/1/Mus-Maximus)