Any good slave stories? [NSFW]

Gadgetphile
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice
My Little Pony - 1992 Edition
Not a Llama - Happy April Fools Day!

(Should this be tagged NSFW?)  
I’m looking for stories where ponies are forced to work as slaves (Like in ‘A dog and pony show’ for instance.) Any stories you would recommend? (Mane 6 and/or CMC preferred.)
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