Our dirty little secret

When I was a young girl at the age of 9, a new boy moved into my neighborhood and started going to my school. Lets say his name was Phillip. Phillip and I quickly became friends, because at the time I was a bit of a tomboy. We had class together a lot, so it was common for me to be seen at his house or visa versa doing homework. We both dated different people in middle school and I thought of him as a friend. I don’t exactly remember when or why, but my feelings for him started to change. Before I get too far into my story, let me tell you what I was like back then. I was a freshman at age thirteen, and I was skinny- only weighing about 90 pounds soaking wet. I had B cup tits and curly brown hair which I sometimes wore straight. So I was thirteen, and Phillip was 15. I started to develop a bit of a crush for him. He was popular and even though I wasn’t ugly, I wasn’t exactly his type. He still thought about me as a friend. 
That all changed one day. 
I was having problems with my geometry homework, so I asked if I could hang out at his place so he could help me. We rode the bus home together, but we had to walk a few blocks to get to his house. Unfortunately, that day it was raining pretty hard, and we both got drenched. You could kind of see through my top, so when we got to his house, his older sister gave me a new one. His mom was in the shower and then her and Phillip’s sister were heading out. Because of this, I had nowhere to change except for Phillip’s room. I told him to turn around and quickly took my soaked top off. While I was changing, I noticed that he was watching me change in the mirror he had in his room.