Not a surprise at all in action, but certainly one in Crowley never having heard about it. The demon takes note of that coy little smile, and Crowley takes a healthy gulp of their drink, leaning back toward the dance floor, their hand sliding across the angel's forarm until they can grip firmly at his hand. 

"Oh, come on, you'll love it." Crowley eggs him on in a teasing tone, grin wide on their lips, feeling properly buzzed, at least enough so to embarrass an angel just a little.