My wife has a younger sister who is not only beautiful but also has a very attractive figure, her name is Suzumiya. On the occasion of her recent graduation with a good result, my wife and I took her to the city for a few days to help her relax after the stressful hours of study. Upon meeting her, I seemed to be immediately captivated by her beauty, dark thoughts began to appear in my mind even though I knew it was extremely wrong. One time when my wife was out, I happened to see her cooking, revealing her firm and exciting buttocks, I couldn't control myself and suddenly hugged her from behind, making her unable to react. I continued to touch sensitive areas on her body while she did not resist at all. This showed that she was also very interested, so I boldly seduced her to have a secret affair behind my wife's back.