A few years back, there was this beautiful girl in my English class, Diana. Dark hair, tan skin, nice boobs and a figure to die for. Anyway, the class was split in half, one half on the left, one half on the right, facing each other and the teacher was up near the board. Well, one day I got to class and a few minutes behind me, Diana walked into class with a low cut shirt and a really short denim skirt. She walked over and set down in the chair just opposite mine, and as she sat down, I noticed I could see straight up her skirt! I could see every detail, she had a black lacy thong on... Well, me, being the horny teenager that I was (still am I suppose), became instantly erect.
Then came the dilemma, do I stay here and watch continue to look up her skirt, or do I try to sneak off to the bathroom and relieve my aching cock. Diana shifted in her seat and I could see a distinct line where her thong had slid into her pussy just a little bit. I shifted in my seat as my penis grew even harder and then I felt it slip out of my boxers and touch the inside of my jeans. wow! I then grabbed my book and put it in my lap, keeping on eye on the teacher so if she turned around I wouldn't be as obvious looking up this sexy girl's skirt.
I began to grind my penis between my jeans and my leg... I'm usually pretty quiet, but this time I really had to watch it. It took almost 30 minutes to get close to cumming cause I had to keep stopping when the teacher turned around, or Diane looked around. Finally I felt it get close and just then, she spread her legs a little and I could see all of her beautiful legs and thong... It sent me over the edge, I contained the spasms, as my cock shot cum all the way down my leg. Just then it hit me, was anyone watching? I looked around and everyone seemed either asleep (very boring class) or watching the teacher. I was relieved. I looked back and then Diane looked over my way and I gave her a smile, knowing that I had just jerked off in class and looking up that sexy girls skirt.