A sweaty, middle-aged woman, a sexually active personal trainer, secretly had sex with a young student at home, ejaculating during a lesson. (Igarashi Seika FOCS-225)

The Tsinghua University student who posts fitness videos is unsuccessful in her personal life, despite the quality of her videos. She has a sexless marriage. One day, she decides to teach fitness classes at home and releases her pent-up desires during class. While sweating profusely, she secretly teaches her young students how to ejaculate inside them, without her husband's knowledge!