Yuki lives a happy, albeit ordinary life with her beloved husband and their only son, Satoshi. The neighborhood wives often complain about sexless marriages and husbands' infidelities, but the Kobayashi household enjoys regular nighttime activities, and Yuki's hardworking husband shows no signs of other women, for which she is grateful. One day, however, during a night of passion with her husband, Yuki is caught by Satoshi, who has just entered puberty. Worse still, Satoshi discovers that Yuki loves having her nipples played with, causing him to become abnormally excited and unable to control himself…
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