Yuzu Shinkawa, the mischievous queen, mercilessly dominates a male masochist while maintaining her innocent smile. As he nervously fumbles and fails to greet her properly, she slaps him to snap him into focus, then proceeds with strict discipline using a whip. She mounts his face with her large ass, completely covering his nose and mouth, controlling his breathing. As the first test to become her human toilet, she performs mouth-to-mouth feeding, making him eat salad, pudding, cake, and more. Each time, he is forced to swallow not only the food but also her saliva, snot, and phlegm without hesitation. Finally, she makes him drink her urine as a piss receptacle, advancing him to the final stage of being a human toilet. She mixes large amounts of urine with her spit for him to consume, then defecates directly onto his body. Growing irritated as he slowly eats the feces, she uses chopsticks to pick it up and feed him properly, demonstrating meticulous and cruel training throughout.