Then I'll give you my kinda' classics to you. :P

First of course, The Doors of Time
Second, Sunshine on A Rainy Day These are J2 AU.
Third is Seven Days from fanfiction.net It's gen and about Dean and really really sad but I love it to pieces.
Also Blood Lines from tahirire, I'm not sure about the writer's name but it was last year's big bang project and kj_svala who is my friend made its art and it's also fabulous! :D