Please Don't Hunt Me Down, Brother (Sabriel/Destiel)
13 parts Complete In another version of the Supernatural universe, Sam and Dean Winchester are still hunters, their parents both dead, but Gabriel and Castiel Shurley are hunters, too.
Castiel's real surname is Novak. He's adopted by Gabriel's father Chuck Shurley and Chuck's sister, Amara Shurley and brought into the Shurley hunter home after his family are killed by vampires when he's no older than four.
One day, Chuck hears from another hunter of sightings of the vampires that killed Castiel's family. Gabriel, intensely fond of his younger adopted brother, insists on hunting them down- but is captured and turned- and forced to kidnap Castiel.
Chuck and Amara contact Bobby for help with the missing boys, who passes the case to Sam and Dean.
When the Winchester brothers set off on this hunt, everything they know will change. Love hides in the unlikeliest of places.