A heavy rider

Mistress Cathy knows that she's a heavy rider but her slave is   punished nevertheless if he doesn't serve her as a pony properly. She   trains her human pony and rides on his back. In between she likes to   grab his head and compress it between her powerful thighs. If he isn't   able to carry her weight on the back he is punished with a heavy   facesitting in the end!

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