2B doesn't move as 9S cups her cheek. Neither to lean into the feeling or pull away from it. Her instinctive reaction might be to pull away, but there's no need for that anymore, is there? And yet, even without the need to remain distant, there's still the fear of getting close.

The closer she is to 9S, the more it hurts both of them.

She doesn't move in to help close the distance, but once his lips are on hers, 2B sighs through her nose at the closed distance, the relief, the fear, it's all mingling into one mixed up strange emotion that makes her chest hurt and her heart race.

Slowly, tentatively, 2B presses back against him, deciding to no longer be idle, and her hand moves to the small of 9S's back, like it had when they'd be dancing.

This, is what she's wanted for so long. This is the closeness she's been craving with 9S.