A high school boy puts his girlfriend to sleep with sleeping pills and attacks her older sister. The shock of being raped by his younger sister's boyfriend is short-lived, as his friends come to his house to get their hands on his older sister's body. While being penetrated one after another by the cocks inside her, she endures various embarrassments such as "cooking," "taking out the trash," and "delivering deliveries," and her sensitivity soars. And 10 hours later, she is swinging her hips and devouring the cocks herself.