Castiel stood there patiently while Dean found words. Dean was usually hot-headed and he tended to either throw words out without thinking or stand for some time while he tried to find the right ones. Castiel was accustomed to Dean's quirks, and patient.
He cataloged this Crowley's set of attributes. Yellow eyes and slit tongue sounded to him like a very poor human disguise. Perhaps this demon was too old to understand what a normal human looked like. Castiel knew what a normal human looked like. He was proud to have Jimmy, who was both devout and very, very normal.
The hug surprised Castiel. It made him more certain that the loss of Sam had severely damaged Dean, and whatever was happening here was cosmically necessary. He patted Dean's shoulder blade awkwardly. He didn't know if that was normal. "What are you going to do?" he said, in his concerned, grim voice.