Young wife Tsubomi struggles with sex due to her husband's large cock and her own tight pussy. For a woman with a naturally strong libido, this period of sexual abstinence is extremely painful. One day, she confides in Abe, a local gynecologist, and decides to undergo vaginal stretching treatment with his help. As he widens her vagina with his fingers, her frustrated pussy becomes soaked and she moans aloud. Convinced that penetration up to 2.5 centimeters doesn't count as cheating, she gradually begins accepting his cock. Eventually, he reaches deep inside her, giving her a creampie. Awakened to pleasure, Tsubomi continues the "treatment," using it as an excuse while getting fucked more and more.