His lips worm and squirm around the tip of her finger. He can't help but smirk. Beckett's touchy-feely when she's had a couple (or half a bottle). Castle isn't sure how far his sense of gentlemanly propriety will stretch as long as she's looking at him like that. "That I have a daughter?" he asks. "Birds do it, bees do it, even bestselling-authors-slash-cop-tagalongs do it, Beckett."