This is not my story, rather one I found elsewhere and loved so I edited a little and am sharing it here.
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I remember an incident that happened to me when I was in high school.
After classes one day I decided to cut through the girls' gym and saw two girls talking to each other there. One of the girls Jenny, was very pretty, while the other was a skinny, mousy girl named Lisa. Lisa was about 4 inches shorter than me. To get Jenny to notice me (I had a crush on her) I teased Lisa as I walked by them.
All of a sudden Lisa grabbed my arm, spun me around and slapped me across the face! I was shocked and pretended it didn't hurt me so I wouldn't look bad in front of Jenny, but I was dazed from it. I put up my hand to keep Lisa away but I accidentally caught her blouse and tore it slightly open so her lacy bra was exposed.
Lisa was enraged at this and punched me in the balls. I doubled over from Lisa's punch, then Lisa proceeded to grab my hair and pull my head up, then punched me right in the jaw. This made me crumble to the floor like a little wimp. Looking up at the girls, I was really embarrassed as my balls throbbed and jaw ached. I could see Jenny's mouth open amazed that this little girl Lisa was beating me up.
I was quite embarrassed to be beaten up in front of the girl I had a crush on. In those days I was already wearing panties and it wouldn't be long before my secret was discovered. Lisa grabbed my tee-shirt and must have caught sight of my panties exposed above my jeans as she pulled.
Lisa exclaimed, 'What's this!' To my horror she began to unbuckle my jeans. Jenny walked over closer to us to get a better view. I struggled against Lisa but she was stronger than me and in my dazed state I was no problem at all for Lisa. Lisa furiously undid my jeans with me holding them futilely with both hands and with one quick motion she yanked my jeans down to my knees while I laid on the floor!