A remarried mother ~Forbidden incest with her husband's stepchild~

It's been three years since I lost my husband in an accident. Satsuki, who lived with her son Kenichi, received a marriage proposal from a man. Kenichi readily agrees to remarry, and Satsuki is excited about her new life, but... Shortly after remarrying, Satsuki felt sorry for her husband's stepchild, Ryota, who was being treated maliciously by her husband. Satsuki ends up being played with by Ryota, who has become a new member of his family even though they are not related by blood. And Kenichi finds out about it...