FNS-199 Playing Pranks With Classmates While Preparing For The School Festival. The Rope Of The Handcuffs That Were Tied Up As A Prank Triggered My Masochistic Switch—After Enduring The Wriggling Of My Hips And Suppressing My Moans I Awakened As A Masochistic Pet. From That Day On We Became Addicted To Playing S&M Games That We Absolutely Had To Keep A Secret From Our Classmates… Yoda Rin