I don't want to give specific advise to this. Nothing great is coming to mind. But just bluntly saying "Let's fuck" out of the blue is going to end poorly 9/10 times. Including a lot of times where she absolutely would have hooked up with you again.
What I'll say here is lame, and I don't think you should do it... but it's better than what you're thinking. Get a movie and ask to come over and watch it. Awful? Yes. Obvious? Yes. But that's at least 3/4 chance of getting blown out instead of 9/10 :p And it probably leaves you with a better opening in the future than the direct way.
Hopefully someone else has a better idea

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Quote:
Build an emotional connection through your hard throbbing cock.
Build trust and comfort by holding their hands and covertly rubbing your elbows on their nipples.
RSDTyler