Castiel had never been so easily defeated. He even seriously thought about protesting but he also knew she had a much better idea about what was going on and he knew how to break a fever. It was just easier to inflict it on someone else.
He lay still, turned his head to the side, towards Jo. "You... you're gonna stay all night and watch me to make sure I don't actually do anything to alleviate my discomfort, yes?" It was almost a pout.