When Jun's father remarried, Rika became Jun's new mother. During his teenage years, Jun was intrigued by Rika's huge breasts, which looked as if they were about to spill out. He would peek into the bath and reminisce about what he had done with Rika. As Jun was peeking as usual, Rika noticed him. "Can you promise not to peek anymore?" Rika gently admonishes Jun, but the sweet scent of her shampoo stimulates Jun's sexual desire, and he attacks Rika, forgetting that she is his stepmother.