My little slave is in position, butt plug in his ass and locked nicely in a chastity cage. This is how he will be presented to my party guests tonight. Always on all fours because his primary role is to be a party pony! All my BBW friends will be there and want to take the little guy for a ride. Before it starts, I need to take my pony around for a test drive and make sure he understands his duties. I have a paddle in case I need to discipline him. The pony is at first very slow and unremarkable. But a little bit of motivation through paddling fixes him up for awhile. However, the pony tires out faster than expected when I sit backwards with my ass on his shoulders. I have to dismount to kick and beat the idiot sometimes. I use him as a bench in the center of the room as well. Mashing my ass down on him and making him feel very small and diminished beneath my meaty thighs which cover his entire back. Several more laps around the room are taken, and the pony becomes very sweaty and despondent. Beating him into submission has taken all the fight out of him. I make him kiss my ass and thank me for using him. I fart in his face. That shows how little I respect him. I explain that due to his lackluster performance, he will also be on toilet duties for the party. He will carry women to the bathroom, then eat their waste. He cannot refuse. He thanks me again and I tell him to get out of my sight.