Any help in locating this story is greatly appreciated.

Twilight and friends end up on Earth where people keep ponies as pets as Hasbro basically makes living MLP ponies to order for customers. The made ponies can think and speak and want to be owned in most cases while Twilight and the main 6 see it as slavery.

It wasn't finished and was only 3 or 4 chapters long.

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Damn,I wish hasbro did that. They'd be rolling in the dough.