[Hiyashi Makura] Toaru Natsuyasumi no Chitsunai Hounyou Renshuu Nisshi - Boku no Daisuki na Seo-san o Shoubenki toshite Shiyou Shita 28-nichikan | A Certain Summer Vacation: A Diary of Vaginal Urination Training—28 Days of Using My Beloved Seo-san as a Urinal [AI Translated]

A shy male vows to turn his beloved classmate Seo‑san into a living urinal, documenting the 28‑day regimen of vaginal training, careful positioning, and the intense pleasure of forced urination. The story unfolds through intimate dialogues and explicit scenes that highlight the tension between consent and desire, as the pair experiment with ovulation avoidance, water intake, and the risk of pregnancy. Each day brings new challenges and erotic discoveries, drawing the reader into a provocative diary of bodily surrender and mutual stimulation.