I looking for Treehouse Of Horror style of stories.

I have an idea for a story.
it goes like this Trixie was trying to absorb Celestia´s magic, while Celestia tried to do the same to avoid Trixie dooming the world, accidentaly, the alicorn amulet reacted due to the magic overload, a blind flash happened, and end it up fused together.Trixie is now happy that she has alicorn magic and want to rule everything.
Princess Celestia is so not happy to be apart of her and what worse Trixie has control on there shared body!!
AS SEEN HERE:

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