STARS-603 The lesson the younger sister gives her older brother

My sister Suzuhara Miran is a gentle tutor, not only good at teaching but also good at teaching SEX. I will never forget... The lesson was just me and her! I'm preparing for the upcoming exam, but because of the pressure, I can't concentrate on studying for the exam. However, my sister tried to achieve her goal through a physical relationship with each other to reduce pressure and help her mind feel more comfortable to focus on the exam. I was surprised by her approach. He taught me and the tricks were so effective, I hid this and never let my family know about my incest with my sister.