Castiel sighs, it's that world weary sigh he gets when Dean is missing the obvious. "Death was not the only one who left this plane and left an heir in his stead."

He feels a bit uncomfortable now, having to explain this. He couldn't communicate it when it was happening because it was war in heaven like he had never seen it and when he had left to try and answer Dean's dying prayer it had almost cost him everything he had fought for.

"You ferry the souls of the dead between hell, heaven, and purgatory. Sam rules hell. And I preside over heaven."