Takashi, a freelance worker, had a younger sister named Kotone who was a high school girl with few words and introverted. One day, he casually used a 'stimulus ray' borrowed from a friend on his sister, and her nipples became 100 times more sensitive than an average person's… Since then, Kotone's daily life changed. Unable to stop the stimulation on her nipples, she loses control and urinates while making a face of ecstasy. Her brother Takashi can't contain his excitement at seeing his sister's transformed state and keeps venting his pent-up sexual desires onto her. Every day, relentlessly torment the nipples, make her cum multiple times, repeatedly force her to show a sloppy face and lose bladder control. After finishing, use hypnosis to make it seem like nothing happened, erasing the memory... #dick
