She can tell that she's arousing him, and she wishes she wasn't. This is all an act for her, purely pragmatic. And she knows that for him, a sexually charged situation is something that he has at least thought about. She feels like she's playing him, taking advantage, and she would never do that if she had any other choice.

He moves to wrap his jacket around her, and she presses herself closer.

"I need you to guide me through the party and the lobby," she murmurs into his ear. "I'll guide you once we're outside." She smiles faintly. "I'm taking you to my crib."