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Saki's son, Yuki, is invited by her classmate Masaru's mother, Yurika, to go on a hot spring trip with her two parents during a spring vacation. In fact, Yuuki has long admired the beauty and sex appeal of Yurika. At the inn, I witnessed the long-awaited naked body of Yurika thanks to the mixed bathing hot spring. Yuuki, who is excited and does not cool down, sneaks into Yurika's bed and sneaks at night. And the unfaithful relationship between the two became known to her mother, Saki, and Saki, who loves Yuuki, also estrus.