He asks, and she answers, rising a little faster, falling a little harder, until she's breathing hard too. Her thighs flex, gripping his hips, keeping them aligned. Can't have things going awry now. This is too important.

Her hips flex, and there's a little swirl at the end of her stroke, because she can't help herself. There will be time to play later, she knows, so she does her level best to keep things simple, and solid.