Sorry for the late reply. :-)

There's a Hole in the Fabric of My Reality by etrix

Dean has always been a pain in Sam's butt, causing trouble in school, causing trouble at home. When he disappeared for 7 days the summer of 1997 everybody assumed it was either an overlong party or something to do with a girl. Sam didn't think so. Sam had visions of wings and water and light and death. So when Dean knocked on their front door like a storm-wrecked stranger, Sam stood back and wondered who had shown up at their house.

http://archiveofourown.org/works/501495/chapters/880452


Cheers,
Caelulum