I attend a university in Tokyo and visit my parents' home every long vacation. Some time ago, I started an illicit relationship with my sister-in-law Yuka, who is also my brother's wife, only during my visits. At first, our relationship was just kisses, but it grew stronger every time I visited. Even when we couldn't meet, I remembered all the kisses we had, and my heart beat faster, and we kissed and shared our feelings every time I visited... We devoured each other passionately, hiding from our family's eyes. One day, when I returned to my parents' home, my brother told me that he had given birth to a child...