[His eyebrows raise at that, and for a moment he looks like he doesn't know what to do with it. It certainly made him want to go faster and harder, but he's still concerned about hurting her. He pushes her leg up more as suggested, but although he speeds up a little he doesn't go too hard.]

Like you said... hard is for later.

[But the idea of her begging is exciting. He wonders if he could get her to do it...]