Sunako Kirishiki, the sultry sadist, allows her slave a rare choice in their sex game. The slave, a slim girl, eagerly selects the cowgirl position, straddling her master and guiding her own pleasure. Sunako, however, isn't one to make it easy. She clamps the slave's nipples, sending shocks of pain and pleasure through her body, and handcuffs her, limiting her movement. The game heats up as Sunako switches to a reverse-cowgirl, her slave beneath her, helpless to do anything but take the intense, dominating ride.