Katie couldn't helping laughing. It was irritating. There was something about Roger that made her want to smile, but then she was completely furious with herself for giving it and giving him that stupid, smug satisfaction at having managed it. It was the whiskey, obviously. Katie definitely wasn't actually having a good time with Roger Davies.
She was also trying very hard to tell herself that she didn't like the way he held her close when he pulled her back in from the spin. He wasn't that attractive. She was just intoxicated enough to appreciate the nearness of any warm body, regardless of who it belonged to.