FNS-199 Playing pranks with classmates while preparing for the school festival. The rope of the handcuffs used as a prank digs into her skin, triggering her masochistic side—her hips wriggling and her voice suppressed, she awakens as a masochistic pet. From that day on, we become addicted to playing S&M games, a secret we must keep from our classmates... Yoda Rin

While preparing for the school festival, I playfully tied up my classmate Rin's hands, which turned on her hidden masochistic side. The tightness of the rope and the feeling of being restrained made her wet her underwear and feel pleasure. From there, the two of us started playing secret S&M games everywhere—a classmate-teaching sex that "cannot be told to anyone."