I'm looking for a specific AU fic. Werewolves are things, and as children Dean and Cas are kidnapped, and they ended up bonding (the friendly kind) while locked in their cages, and one of them is taken away (I think it's Cas) and the other thinks he's dead. Then they get freed and never find out about each other. THEN as adults, kid werewolves are being taken again, and one of them finds the other and they have to work through their past while trying to find the missing kids.