Suddenly, a torrential downpour started, and my beloved older sister, soaking wet, came to my house to take shelter… The situation of us being alone together, and her see-through underwear, made me completely lose my composure!! UMSO-518

Because I didn't have a girlfriend, I started to develop feelings for my tutor, the older sister. One day, the older sister, who was supposed to be home, was caught in a downpour and returned completely soaked. Through her white shirt, I could see her wet hair and underwear... My parents happened to be away that day... I couldn't control my emotions and watched her dry her hair...