Shiori is a member of a swimming club who decides to get a sports massage to care for her body after swimming. Her body is extremely sensitive, reacting intensely even to light touch around the muscles near her groin. Her large breasts (estimated J-cup), visible through her competitive swimsuit, tremble and shake as she repeatedly reaches orgasm from the stimulation. As her arousal builds, she desperately begs for a special course involving direct insertion of a penis.