(straight female POV) Jackie is a tomboyish girl who's been managing to get away with pretending to be a boy on her high school baseball team, but she can't keep her secret anymore. She loves baseball, so she doesn't want her gender to be revealed. But she's also a horny girl with a fat butt. The boys tease her for it, and she blames it on her routine as a pitcher. Still, she can't help but notice their stares lingering longer this year. Over time, the boys realize that she'd be a perfect slut to blackmail.
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The prompt is written in second person for the girl, but the AI (at least dragon) will adapt if you write first person instead without modifying the tense of the prompt or memory. The AI might require you to re-iterate that you are, in fact, a girl, even if you pretend to be a boy until the reveal scene. You can have this end in a gangbang or modify it for only one boy to find out. Could also go for the coach or play from his perspective.
based on a doujin