Crowley watched the way Kol bit his lip and was so very tempted to lean across and bite it himself, to lose all the thoughts in a rough kiss. Even if Kol was teasing him about Ruby. "She's possibly as stubborn as me. Maybe." Okay, definitely, but Crowley wasn't about to admit that.
"A thinky vampire, isn't that a contradiction?" He may have lacked the attitude towards vampires that Ruby had, but that didn't mean Crowley couldn't joke about these things anyway. He was just that sort of demon. "Question is, do you want to be thinking, or want to be very much not thinking right now?"