For some reason, I'm dying for fics where Dean is sent to a universe where the canon events haven't happened, or time-travels back to when he was younger, yet he still has all his memories. Also, does anyone know of some fics where Mary finds out what the boys have been through and doesn't react well to it? Basically any fics where alternate universe or pre-series Mary/John/Sam meet canon!Dean.

(In case you want examples, some really good ones that I've read so far are:)

If I Knew Then What I Know Now:
Given an opportunity to change his family's destiny, Dean Winchester finds himself back in 1983 as his four year old self, yet with his adult memories still intact. But can he alter the events of that tragic night? And if so, will young Dean, his family, and Castiel be ready to survive all the evil that destiny has in store for them?

The Best Years of Our Lives, My Ass:
Dean goes to sleep in a motel room in Texarkana, and he wakes up 17 years old, in his childhood bedroom in Lawrence, Kansas, 1996. He has no idea how he got there, why his parents are still alive, why his brother is an adorable freshman with no memory of his adult life, and why the only ally he has in this place is the angel he left behind in Purgatory – somehow also 17 years old.