The third annual "Masturbation Grand Prix" returns with the G-cup duo Maina Yuuri and Yurina Aizawa, joined by the popular small-breasted loli favorite Hina Kannno, in a special where three sexy girl riders indulge endlessly in masturbation. Winners and losers are decided in each round, with defeated girls subjected to erotic training sessions. Scenes include uphill training in standing doggystyle, dual masturbation while performing phone sex, and more. This complete version features numerous unreleased scenes not seen elsewhere. The ultimate winner engages in a unique breeding session with a stallion, chosen to pass on superior genetics. Watching this act drives the other girls into even greater arousal, creating a chain reaction of escalating pleasure.