Ooh, there's this one by meus_venator Snow Falling
http://meus-venator.livejournal.com/52933.html

http://archiveofourown.org/works/1085946

Summary: The city of New York breathed a collective sigh of relief when infamous crime boss Dean Winchester was shot down, but things aren't exactly what they seem. Not with a man like Dean Winchester, Sam remembers another man.

Grab a box of tissues before you start.