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Well, I could place here a normal story description. But if I had to guess, we’d say you already know what we mean if here simply stands ‘HIE as Nightmare Moon’.
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What? Too meta? The only meta thing you can’t write here is about the real world.
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Original (HTML & epub).

Tags: < MLP:FIM | Sex | Anthro | Human | OC | Nightmare Moon >
(Sex only implied, and NOT a main aspect in the story.)