For which Crowley has been more than grateful since they cracked it open - though the faint flush to his cheeks is more likely due to the firelight. Probably. In any case, it doesn't perceptibly increase as he takes an appreciative swallow of his own, before stowing the flask back in his capacious pocket.

(It ruins the line of his coat, but Crowley doesn't imagine that Raguel would be much impressed by a stylish silhouette in any case.)