When I was a student, my father decided to remarry. My new mother has a daughter who is younger than me and her name is Miu. Miu treated me very naturally, even though I was a dull person with few friends and few words. I was gradually captivated by her pure, bright personality, and cute, feminine, bulging body. One day, my parents were going on a honeymoon a little later, and for a few days, my sister-in-law...