This one is gen: Coming Down on A Sunny Day (http://archiveofourown.org/works/2276331/chapters/5002224). Summary: In 2009, Castiel watches the Apocalypse end disastrously and makes a decision. In 1984, John Winchester suddenly finds himself with another little boy on his hands, one with dark, messy hair and sad blue eyes who won't leave John and his sons alone.

Thank you, this sounds awesome!

How (thanks to Gabriel) Dean and Castiel (accidentally) raised each other (and Sam). Summary: In which, Gabriel meddles with the time line and Castiel becomes Dean's angel rather sooner than intended.
http://archiveofourown.org/works/540915?view_full_work=true

Wow, cool sounding rec! Thank you!!

We built our own world
http://archiveofourown.org/works/544932?view_adult=true
What if instead of Mary, John died in the house fire? What if Castiel, to protect Anna, fell much sooner? What if Dean and Cas meet during Sam's first year at Stanford and start hunting together?

and there's a long one - The Long and Lonesome Highway which I can access from here but is on ao3

there's another one that I can't find where Dean thinks Cas is a ghost I think? he appears to Dean when he is very young and visits throughout his life.... can't remember what it is called, it's eventually Destiel i think? maybe someone else will know it.

UGGGGH I remember that one, and I can't find it. I want to read it again. I've just spend 3 hours in bookmarks and google trying to find it. Curse you LiveJournal *shakes fist in air* :) If you remember it, let me know please :)

Thanks very much, this is awesome!!

http://archiveofourown.org/works/8606395?view_full_work=true



Dean Winchester's life changed forever the night a demon appeared in his brother's nursery and killed his father.

As a hunter Mary is determined to protect her sons from the evil she has run from her whole life - the same evil that took John. But Dean also trusts his protection to the angel in a trench coat he talks to in his dreams. Through years of tribulation and uncertainty, the Winchesters (plus a corgi that might be magic and an angel that may not be real) must fight monsters, demons, and even fate itself to survive as a family.

Or: The one where Mary lives, Cas is there, and nothing and everything changes.

Thanks!