I stumbled upon a pretty girl in a compromising position near the elevator

I was taking the elevator down when I saw a pretty girl in a compromising position. I couldn't resist and ended up joining her for a wild ride.

I was going to my class, and I went through the corridor near the elevator. Suddenly, I saw a pretty girl who was in the compromising position with another guy. I was surprised, because I didn't expect it. I wanted to see what was happening, so I stood near the door and watched. The girl noticed me and she became embarrassed, but she continued to do what she was doing. I decided to take my chance and I went up to her and asked her what was going on. She told me that she was just playing with him and that it was not serious. I was very happy to hear this, because I really like cute girls. Then, I asked her if she would like to have sex with me. She agreed, and we went outside. We started kissing and then I put my tongue in her mouth. She was very excited and she began to suck my dick. I fucked her hard and she moaned loudly.