We rush into a training camp where students gather and pick up a busty college girl from the swimming club! We ask her to help us with the experiment: "Can an athlete keep Kokoro even if her nipples are played with?" At first, she wriggles her body and lets out a sigh, but she manages to hold back, but her nipples are relentlessly kneaded and twisted, and to top it off, she is subjected to nonstop nipple play with a cyclone rotor! She climaxes without being able to resist! The athlete's nipples have been developed for the first time in her life, and she is now sensitive, so she can't refuse creampie sex anymore!