Riku is a masochistic pet owned by a real-life master, with an unusual career of appearing in AVs on command. This time, she was ordered to appear in this work to improve her deepthroating skills. Having never experienced deepthroating except with her master, she was filled with anxiety, but she had another absolute reason why she couldn't return without winning. As she endured the deepthroat training with giant cocks, she nearly broke several times, but her unwillingness to lose helped her overcome the challenges. Taking advantage of this woman's weakness, the deepthroating assault was relentless!
