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This must be some kind of horrible joke at Castiel’s expense. Is he truly expected to protect a King? One who has been their enemy for as long as he can remember? He is much more suited to being a part of the army, or at the very least someone who helps to train the knights. That would be far more preferred than having to watch over the King. It means Castiel would get to keep fighting – and that’s the only way he knows to give meaning to his life.