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The Tsuki couple, who were troubled by the husband's erectile dysfunction, found an advertisement for a hot spring that is said to be effective in strengthening sexual energy, and decided to take a trip there to recuperate the father-in-law. Hoping for the efficacy of the secret hot spring, it has no effect on the husband... but it works wonders on the father-in-law! Ruisa only assists the father-in-law, who is suffering from an unwanted full erection, by gently satisfying his sexual needs. However, the father-in-law's penis, once revived, is not easily calmed, coupled with Ruisa's beautiful yukata robes, and the lust of the two, which has nowhere to go, intertwines violently... #BanchoP