In a slave market, two mistresses enjoy a ponyboy race using three slaves. One slave is made into a human chair, and the two slaves compete in a race. One mistress sits on the human chair and hits the slave’s buttocks with a riding crop, while the other mistress hits the buttocks of the ponyboys during the race with a riding crop. The mistress rewards the winner by rubbing her buttocks on his face, and whips the loser. Next, the slave gets on all fours, the mistress gets on his back, whips the slave’s buttocks, and makes the slave run a time race. Of course, the winner is given a reward, and the loser is punished by being whipped after being shown the winner’s reward. The human chair is always hit on the buttocks and has to "neigh". If the mistress does not buy the slave, he will be disposed of, so the slaves must win the race and appeal to the mistress. In this slave market, the mistress can use the slaves freely, so the mistress can enjoy playing with them as she likes.