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MULTIFANDOM AU DRABBLE MEME

I've got a fanfic idea, but I have no idea how to pull it off. You know how the Mario universe has its own system of granting wishes? Then there's Puella Magi Madoka Magica. I want to write a dark AU of the Marioverse following Madokaverse rules (with Geno as the Homura figure trying to fight the system), but I have no idea how to pull it off.