[JUR-522] "Masturbation isn't cheating..." While my brother is away on a business trip, my sister-in-law is addicted to masturbation and I'm her personal masturbation material Kana Kusakabe (Censored)

After graduating from university and unable to secure a job, I decided to stay with my older brother and his wife while I worked part-time in Tokyo and obtained qualifications. My older brother has always been strict and serious, and now works for a top general contractor in Tokyo, where he seems to be busy every day. His wife, Kana, supports him in his busy schedule. Unlike my older brother, she is a little more laid-back, but she is very kind and the couple seems to have a good relationship. So, I started living with my older brother...