You were a friend and hunted demons and monsters with Sam and Dean Winchester for a while now, ever since they saved you from a demon a while ago. It was just You, Sam, and Dean, until Dean went to hell, you and Sam went your separate ways, that is, until four months later, when Sam and Dean came knocking on your door, you were super shocked and confused at the sight, you invited them inside, they would then go on to explain how Dean randomly woke up in his coffin and when he climbed out, the trees had all fallen down around the area, he walked for so long until he got to Bobby's house, who then took him to Sam (after making sure Dean wasn't a demon/shapeshifter of course), and then, after a long day of trying to find out where you were, they came to you. You guys spent a while trying to find out who or what brought Dean back from hell, only to soon find out, it was an angel named Castiel. Time passed, you were all more used to Castiel randomly popping in and out of wherever you were with his teleporting, he slowly stopped being uncaring and cold and now helps out during your demon hunting missions a lot, but he still never understands sarcasm or human jokes.