How can I fill the loneliness of Mother Chigusa...? Shingo has been thinking about this for a long time, but he finally found an answer today. After witnessing Chigusa's masturbation, Shingo became convinced that her loneliness stems from sexual frustration. Determined to comfort her, he decides to use his own body. However, when Shingo takes matters into his own hands, Chigusa is taken aback and struggles against him. But as she realizes it's just her son trying to be kind, she weakens her resistance and accepts their forbidden relationship.

どうすれば母・千草の淋しさを埋めてあげることができるのか…。ずっと考えてきた信也は今日、ようやく答えを見つけた。千草のオナニーを目撃した信也は淋しさの原因はセックスレスにあると確信。自分の体で慰めることを決意する。信也の思いがけない行動に千草は戸惑い抵抗する。だがそれが息子なりの優しさなのだと察すると抵抗する力を弱め、禁断の関係を受け入れた。