Examination Incest ~What my mother taught me~

Sho, a second-year junior high school student, and his mother, Yurika, continue to live a life similar to that of a mother and child due to her husband's overseas business trip. One day, Yurika finds an adult magazine in Sho's room while cleaning and is so confused that she takes unexpected action against Sho's tutor, Aso. Furthermore, she ends up crossing a line she shouldn't cross for the sake of her adult son... Then, the day before the exam, my mother heads to Sho's room with one last thing in mind that she wants to teach him...