Sam screwed his eyes shut as he fidgeted a little too much for his stomach's liking and it sent out a jolt of pain to let him know how bad an idea moving was. Lifting a hand to push his hair back from his face, the youngest Winchester gave Castiel a quizzical look. "So.. when you said I looked good just now, you weren't looking at the outside?" He could never get used to the angels being able to see souls, or auras, or whatever.
"I don't know, Cas. It'd be kind of difficult to explain." Sam swallowed, considering the offer. It would help out the guys at Medical if he was no longer using their resources. But it would take a hell of an explanation to keep Castiel's power under wraps. He doubted the angel would want everyone to know what he was capable of.