From a prompt from
heavenvhellvus:
"But you are warm," Castiel says, his hand resting on Dean's forehead. "In fact, you are exceedingly warm."
"I know. But it's called a cold. Don't ask why, I don't have the slightest damn idea. They should call it a snot, because that's what I have." In corroboration, he tears a length of toilet paper off the roll he's brought out of the bathroom and blows his nose, wincing. "You're the guy who's clued in to the heavenly plan." He chucks the wad of paper in the trash. "Why snot?"
"I am not privy to the reasons of my Father."