One time in high school, I was sitting next to a cute girl in class that had big tits which always hardens my penis. Sitting there gave me a good hard-on that I could not let go by. Since I was sitting at a desk that was at the back of class and the desk that blocked the view of my lap, so I could enjoy myself while sitting next to the cute girl with nice tits.
I stuck my right hand into my pocket of my jeans and with one finger I could rub my penis right at the base of the glans at the frenulum through a hole in my pants pocket. It did not take too long before my penis was throbbing and close to cumming. I rubbed it harder with my finger and taking quick side glances at the cutie with nice tits and within a minute I had a great orgasm in my pants while sitting there and no one knew what I was doing!
My orgasm left a nice wet spot showing on the front of my pants, and since each desk had a faucet, at the end of class I started to wash my hands and oops, I got water spraying over me and covered my wet spot! For the next hour or so I had my limp penis laying in an nice load of cum in my pants with a smile on my face. Another great secret orgasm done.