[Sawada Daisuke] Jyuku-Jo: Koushuubin Onna + Kokubetsu Koushuu 3

A doting mother makes the ultimate sacrifice for her son Shingo's education, offering her curvy, big-breasted body to his cram school as a communal living toilet. While he studies, teachers and classmates line up to use her mouth, womb and ass, filling her until she's soaked in sperm and urine and still begging to be saturated inside and out. When the final bell rings, the boys are already planning to continue the lesson at home.