The older brother played a prank on his younger sister who was new to cosplay. He used sweet words to make her cosplay for him to see. After she cosplayed, the older brother took pictures as souvenirs, but every day in his horniness, he used those pictures to masturbate, and one day, when he couldn't take it anymore, he asked his younger sister to cosplay for him to see and then raped her while the whole family was at work.