My name is Liu Yu. Because I was born on a rainy day, my parents gave me the name "Rain" in my name. I am 17 years old and am preparing to go to my second year of high school. I usually love sports, especially in martial arts. When I was a child, I learned it from martial arts experts for a few years. Now I will play a set of martial arts routines regularly every day. I don’t know if it’s because of my learning martial arts. I jump very fast, and my height of 1.8 meters stands out among my peers. At the same time, I think I am also a monster. Of course, this is not my appearance, but the cock under me, which is very big and thick.I thought it was normal until I was peeing in the school toilet, and found that students who were the same age as me and even older than me had the penis under them were not half as long as I remember that I was only 15 years old that year. As soon as I got home, I took a ruler to measure it secretly and found that the penis had been 15 cm long. Now I guess it was nearly 20 cm long, which is comparable to the American AV male actor. If I don’t have an erection, it is probably 10 cm long. This makes me very depressed. Now I feel quite awkward when I wear a normal size panties.