He notes that she doesn't pull away - or slap him, which was another option - but continues to look into his eyes. He can tell she's a little nervous or a little excited, depending, and is uncertain which one is winning.
Oh, and screaming. That was a third option. She isn't doing that, either.
Jack let her finger go with a soft pop and says, "I could keep your mouth busy, but - I'm getting ahead of myself. Bring your drink, baby. You need to come with me to the Lobby and sign into this joint."
And he slides from the booth, his drink in one hand, and holds out his other hand for her to take.