Mina has a strong sex drive but is frustrated due to her husband's business trip. One day, her son's friend Ko-suke visits and is captivated by her unguarded appearance. Noticing this, Mina casually seduces him and lets him grope her, but she finds herself climaxing repeatedly as he never seems to tire, no matter how many times he ejaculates. From that point on, as Ko-suke visits her multiple times a day, her body can no longer endure the pleasure…
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