He has no idea but he does know she's enjoying herself and that's all he's aiming for right now. The way she's clinging to him gives him a sense of power that will never not be arousing and the feeling of her clamped around his cock is gradually taking his breath away, even though she's barely moving.

'Doesn't hurt? he asks, mainly just for something to say, trying to stay focused and not lose himself in this because he wants to make it as good as he can for her.