Younger, I did a fair bit of travelling and was in south africa for a few months.  I was at the house of a friend of my uncle when their daughter took me outside to show me her trampolining skills, she used to compete at a national level and they had a huge trampoline in the huge garden.  

She was really good doing somersaults and twirls, it was very impressive I must say.

Once finished she sat with me on the trampoliine talking and the ocnversation got to fighting.

She said she could beat me no problem.  I have always been physically fit and didn´t think much to her challenge and just dismissed it.  

But she was insistent that we should wrestle, so I agreed.

It was warm weather and I was in loose shorts, as we started, before I could even react she had reached inside my shorts and grabbed mi right testicle really hard.  My eyes started to water and I could do nothing to remove her grip, she was very atheltic and fairly strong.

Rolling around on top of each other she just wouldn´t let go and I became very red faced and embaressed.  I was shocked it happened so quickly and that a girl had hold of my testicle with her naked hand so nonchanlantly!

Eventually she was sat on my chest with her back to my face still squeezing and I got a huge erection, she was laughing but I was really embarressed!

Finally she let go and I curled up holding my testicle while she sat next to me she told me she grew up with twoolder brothers and knew how to look after herself, I had to agree.

I still think about that moment and it makes me feel erotic every time, but sadly I haven´t hd an experience like that since :(