After discovering that her beloved boyfriend cheated, Miyu locks him in a chastity device and declares that she will control every ejaculation from now on. She used to surrender control as a masochist during sex, but this time she is determined to be the one doing the tormenting. She relentlessly teases and punishes him through three months of enforced abstinence, then finally releases him for a marathon session. With his pent-up stamina unleashed, they fuck and climax wildly together for more than 20 ejaculations in total.