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Yukako's son Takashi was a ronin. One night, when Yukako brings a supper to Takashi's room where she is studying, she finds a naughty book under the reference book. It was also a naughty book of a mature woman in which a woman of the same age as Yukako was shown. Yukako told Takashi that she shouldn't be interested in a mature woman anymore and showed Takashi naked and masturbated, and made Takashi masturbate.