Training of Popular Cosplayer's Sister

The protagonist, who was living alone with his older sister in the absence of his parents, loved her as a woman. He spent his days suppressing his warped desire to monopolize her, but one day, his sister starts cosplaying under the influence of a friend. One day, she starts cosplaying under the influence of her friend.
In the blink of an eye, she becomes a famous cosplayer. This alone was an unbearable reality, but finally, she even wants to have a private photo shoot with a famous photographer. The sister innocently rejoices that if her photo book sells, it will be good for the main character. However, the protagonist's inner feelings have reached their limit. She would rather have her hand laid on ...... by a photographer she doesn't even know. On the day of the photo shoot, the protagonist restrained his sister and He executes his plan to rape her while live streaming it over the Internet. Unaware of her brother's twisted desires, the sister goes to the protagonist on the day of the shoot and .......