Hot high school senior sitting on my lap

During pd.7, I Was In Class, sitting on a chair and playing on my phone, then my classmate who was a Senior, decided to sit on my lap. She was Wearing Mint Green Leggings and damn did that butt feel so good. She was like leaning on my chest with her head and started rubbing her butt on my Crotch area Jeans, making my penis grow hard. I didn't want to get in trouble or get caught, so I gave her a hair smell which drove me Wild and started poking her butt with my hard penis, then she started looking at me, and I thought she was gonna get mad at me, but instead she giggled and asked me, "I'm not hurting you, am i?"and i Said "No, your fine, I Enjoy it" then she giggled and Said "well that's good. Then she continued Rubbing Her butt on my penis really fast, Her Ass is driving me insane, she Kept on Rubbing and Rubbing until I started to Jizz In My Pants. So as soon as she got off and started to leave. I tried to cover my cum Stain with my shirt. But Damm I enjoyed that feeling today