Crowley couldn't believe a little insignificant brat outsmarted him. The bloody child tricked the God damned -literally damned by God- King of Hell! Then he did it again! He was furious to say the least but he also thought it was slightly endearing. A simple human genius enough to do that deserved some appraisal, right? Might as well give him a little treat next time they see each other. That'll be after Crowley kills poor Kevin's annoying girlfriend, of course.