It seems simple enough. You call her for no reason at all, you say "I was thinking about you, and I decided to give you a call", and then you ask her to do something (what that is mattes little in the scheme of things). It will either be enjoyable, or it won't. If it is going alright at the end, talk about "doing something like this again" and keep it open-ended.
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Innominate.
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