I'm not certain if it counts but I do remember reading a fanfic wherein a pair of otaku cosplay as Ranma and Shampoo to go to a party or con or something, then a magic spell at the con turns them into the characters.
Now that I remember it more clearly I stopped reading it at about the point I realised it was porn.
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Epsilon
Now that I remember it more clearly I stopped reading it at about the point I realised it was porn.
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Epsilon