I posted this story, Past Problems, on
deancastiel (It's just the best community EVER!) It has chapters 1 to 6/?...it's a work in progress X3
Dean and Castiel time travel back to the past and tangle with demons. Wanna check it out? :D
go here;
http://community.livejournal.com/deancastiel/1492256.html#cutid2