What does it mean if a girl does not object to drinking out of the same coke bottle as you?

I mean we get along great together. We are not like anything sexual we just trust one another. So she was playing Tennis and was on the bench as I walked over because I saw her playing and sure enough she grabbed my coke and drank from it.

What does it mean if a girl does not object to drinking out of the same coke bottle as you?
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