I'm guessing after he mega jizzed like a water hose filled with lotion all over her living room and passed out, things ended up kinda tense between them. And it's also possible he left for college or something. And she may feel guilt that she seduced someone almost young enough to be her son, and he's the son of her neighbor and friend to boot. Which meant if they'd continued, then it likely would have all be behind his mother's back. Her running to take a shower may have been her way of stalling after realizing she went too far with him. And now he's so stuck on her that he may feel nothing for any other woman (Or maybe only likes mature milfy women now). And she may feel a lot of guilt for that since she's pretty much directly responsible.
So now she may either be looking to try and keep herself from restarting things with him, and thus try to act cold and passive aggressive, but can't contain her lust anyway. Hence meeting at a private pool at night in a sexy swimsuit.
Or she blames herself for his current state of being and is caught between her morals as a motherly figure to him, and her lust for the dick she never got to have inside of her so far as we know.
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