As the illicit relationship between a daughter-in-law and her father-in-law deepens, Yuina struggles with her husband's persistent erectile dysfunction and confides in her father-in-law. Wanting to see a grandchild, he listens empathetically and offers to examine her vagina, then suggests vaginal pressure training exercises to strengthen her pelvic muscles. As Yuina diligently follows the training regimen, her tightness increases dramatically—so much so that she can now bring her husband to instant climax. Yet, unsatisfied and emotionally unfulfilled, Yuina finds herself growing increasingly dependent on her father-in-law. #Captain P