FA Pro exclusive actress "Ikumi Kiyoka" in her second feature! Emi, who married into a family of only men as a stepmother, is busy taking care of her father-in-law and looking after her stepson Shinichi and her own son Yusaku. One day, she brings her ex-boyfriend, who is a friend with benefits, into her home and they engage in an act, but they are soon discovered by Shinichi who has just returned home. In exchange for keeping it a secret, Shinichi demands a forbidden physical relationship. In the bedroom where her husband is absent, the mad sighs of a mother secretly leak out... Yusaku, who has spied on them, also begins to run wild! Emi starts to experience a strange pleasure...