She lifts her hips, for all intents and purposes appearing as if she is about to press down against his erection, give him some much-needed friction. But instead, what she does is to lean over him, and kisses that groan away.

As she licks his lower lip, and takes it in her teeth, she brings her thumb and forefinger around his nipple. She bites his lip, and pinches at nipple at the same time.