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Chaoyang, whose hobby is muscle training, finds out that his son's friend, Kentaro, lacks exercise and teaches him various things. The size of her crotch that she accidentally touches reminds her of her sexual desire that cannot be fully dissipated by training alone. And Chaoyang, who lost his desire, tempted him by playing with his cock ... However, her body climaxed many times due to his unequaledness that did not end once or twice, and continued to raise a voice of agony. Chaoyang finally gives up to the unequaled copulation with him that seems to be forever.