This paticular one happened a few days ago.
I was in Global class and we weren't really doing anything so we were all just talking and having fun. The girl in front of me was sort of twisted around talking to me. I won't use her real name, I'll just refer to her as Kelly. We were decently good friends, mainly knew eachother from the couple classes that we shared. Global, English, and I think Bio.
So anyway, Kelly and I were talking and in her seat she was kind of leaning forward and twisted around. Her jeans were riding real low and I got a view of one strap of her thong. This had me hard pretty fast. Kelly is attractive, very much so, but not like a super model. Her face is perfect and she has a good body, decent tits, if a bit small.
So I leaned down and, smiling, snapped the thong strap on her hip. She was shocked and gasped at me, but then just smiled back. She knew I was joking and we're both kinda into eachother. Next what happened shocked me, too.
We were both in the same group for a project that we were doing so she leaned into my ear and whispered for me to come with her out to her car. We both stood up and asked the teacher if we could go out to her car to grab some supplies for our poster and video, the teacher responded that we could. With that we walked out of the room and headed outside into the parking lot to her car.
She opened up the back door and we both sat in the back seat next to eachother. She leaned over and kissed me, and then straddled me. We started to make out pretty fast and furious, my hands roaming all over her body. One of her hands slipped down to the readily growing bulge in my crotch and she stopped for a moment and grinned at me. I took this cue and unzipped my jeans slowly and unbuttoned them. My cock sprung straight up and strained against the fabric of my boxers, a little spot of precum staining the tip of them. Kelly still made no move to do anything to my hard as a rock dick, so I just took it out myself and slowly started to rub it up and down.
After a while of stroking she had her pants down and was sitting next to me, furiously rubbing at her pussy beneath a skimpy pink thong. She convulsed and shuddered forward, moaning and groaning. I moaned out that I was going to cum and she recovered just in time to get her lips around my dick as I shot my load into her mouth and on her lips. She swallowed most of it and licked some off her lips. We just grinned at eachother, wiped up and headed back to class with a posterboard in hand, and our hands in eachother's pockets.
For a few days now we've been dating and we've shared quite a few more experiences like that.