At what stage does this happen?

As I walk into the lunchroom, a female coworker I couldn't see drops something and bends over to pick it up, making me almost bump into her ass... repeatedly.
Let's play with his mind.
He's kinda hot, I want to date him.
Just fuck me already.
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Whenever a girl arches her back facing away from you, or bends over, or similar shit... does it mean she's super in the mood and already wet, or can it be just teasing?
At what stage does this happen?
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