My sister Minami is extremely lazy; besides going to work, she does not do anything at all, and she always blames me for everything. She is also too lazy to buy clothes, so she only has two outfits to change throughout the year. She looks so shabby that no one pays attention to her. After being single for five years, suddenly someone invited her out on a date. Her previous relationship didn't go well, so she has almost no dating experience. She came to my room to borrow dating magazines to look over, but she could only think about food!!! I had no choice but to advise her to go shopping for new clothes; she can't just dress like this when meeting someone. The next day, she came back to my room to show off the outfit she had just bought. The fitted dress highlighted her stunning figure. She kept posing, and since the dress was a bit short, I could clearly see her thong underwear!!! I was almost losing my mind at her alluring appearance. When I woke up, I had sex and ejaculated straight inside her all the time. I thought she would tell my mother and I would die, but no! Not only did she not get angry with me, but she also kept changing other clothes and asked me to judge. She wanted me to help her practice sex so she could be more confident when she went on a date. And from that day on, we secretly had sex every time my mom left the house, and it continued until the two of them started dating each other...