Nami Amuro, who has an attractive slim waistline, takes on the "Cowgirl Time Trial!" If she can make a man cum in cowgirl position within 5 minutes, she gets the prize money! If she can't, she'll have to play a naughty punishment game! At first, Nami Amuro doesn't seem very enthusiastic, so she starts off slow. But as soon as she gets going, she starts pumping like a supercar in top gear, and drives him to cum with her super cowgirl pistons, but what will the result be?