夫に召使のように扱われている五十路母文子とそんな母を不憫に思う息子との禁断のラブストーリー。息子の結婚が決まり、文子は淋しい思いを紛らわすように息子の下着を握りしめオナニーをする日々。息子が婚約者と暮らすため家をでるまさにその日、文子は心に秘めていた思いを抑えられずに行動に移す。愛するわが子を誘惑したのだった…。This is a forbidden love story between the fifty-year-old woman、 Fumiko、 who is treated like a servant by her husband、 and her step-son who takes pity on her. When her step-son's marriage is finalized、 Fumiko masturbates in her his underwear to drown her sorrows. On the day he leaves home to live with his fiancée、 Fumiko is unable to suppress the feelings she has been harboring in her heart and decides to take action....