Mia was about to shift a leg on either side of him, get close enough so that her hips could press into his, when she realized that it was generally unacceptable to grind on someone who wasn't your boyfriend and that she didn't want Sam getting the wrong idea.
It took a moment, as she was certainly enjoying herself, but she finally dragged her lips away from his, breathing a little more labored than it had been a few minutes earlier. "We should probably..." She had to clear her throat. "You know. Stop, before we get carried away." She had to jerk her gaze upward from his lips to look him in the eyes. Her hands were still under his shirt, palms against his warm skin.