Nozomi has been married to a man with a child for half a year and they've been living happily together. However, her relationship with her stepson, Yusuke, remains strained. One day, everything changes when Yusuke reveals his thick, erect cock, instantly captivating Nozomi. She decides to help him relieve his sexual stress, taking the first step toward intimacy. As their bond deepens, Yusuke begins calling her "Mom," and their secret encounters grow more frequent. But Yusuke is insatiable—constantly demanding more, pushing her to satisfy his endless desires. As Nozomi continues to fulfill his needs, she struggles to come to terms with the growing turmoil within her own heart.