Mistress Iside and Mistress Eden had decided to go shopping today but, unfortunately, it is raining hard . They are thinking how to spend the time, while they wait for the rain to stop and Mistress Eden has a brilliant idea: to organize a race between their two pony-slaves. The stage is set: a number of their panties and thongs are hanged in the middle of the studio; the slaves will have to run around the room carrying their Mistress on their back; at each round, the Mistress will pick one piece of underwear and put it around his pony-slave's head. The Mistress who collects more undies is the winner; clearly the pony who makes his Mistress loose the race will be severely punished at the end. So, let's the race begin and see who is the winner!!!