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Make pretty much all wizards trans
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The evil house would be the rare straight, normal people who somehow become wizards despite almost all wizards being trans
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Everything else is the same until the end
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Instead of having a time skip for the last chapter of the last book, it talks about the mental hospital Hogwarts and you realize it's all a drug-addled dream of Harriet, projecting her fantasies on the other people / staff there.
Yeah. Distract from the "bad" ending of Current Thing with the new Current Thing.