It rarely matters what you say. The whole idea of lines is coming from a very logical frame: "If I just say these certain things, then she'll want to sleep with me!" It doesn't work like that though. Focus more on HOW you are saying what you are saying -- tonality, pace, edge/"purr", clarity, etc. and you'd be better off.
If you say this and sound like you are seeking validation, girls will pick up on it. However, if you are saying this like this girl is your friend's little sister who is being silly, you're not going to be worried about what she's saying, you're just having fun. And that's attractive, as it means you're confident and aren't needy.
So don't worry about lines. If you want results with women, focus on who you are, not what you say. The underlying mindset behind lines is usually that you aren't good enough, so you need to fool girls into your bed with the words you say. You know what I say to that? Why not just BECOME a high value, sexy man, instead?
However, that all said, you could probably make that whole exchange a lot more fun by upping the sexuality and/or ridiculousness factor:
Girl: "What was I saying?"
You: "You were going on about riding me like I was some Olympian god whose semi-divine children you desperately wanted to bear. <shake your head> Girls..."
Girl: "What?!"
You: "Don't worry, I get it all the time. Anyway, we can go grab some ice cream over at the docks or, I still need to get some new shoes, so we go check out the thrift store. Which do you prefer?"
