There is a fountain in Washington Square Park in NYC where people congregate on hot summer days to catch the cool breeze generated by the fountain spray.
One especially hot day, as is typical, some people had waded barefoot into the fountain's pool, and a few adventurous souls had run right into the fountain and gotten completely wet. Two young (early 20's) women were watching for a while and then decided to take the plunge themselves. While running back and forth through the water jets, one of them got hit in the crotch with a jolt of water, and remarked to her friend that it felt really good. She began deliberately walking back and forth over the jet of water, becoming more and more aroused. Before long, she was sitting right on the water jet rubbing her crotch, whining and moaning in joy. Her friend was horrified and tried to pull her away, but the masturbating woman grabbed her friend and started playing with her friend's breasts and trying to take off her shirt. She finally brought herself to orgasm.
The other people around the fountain were of course watching in rapt attention, including one female observer who appeared to be amused and delighted by what she saw. The observer began discreetly rubbing her own crotch underneath the book she was holding, but got embarrassed when she realized she was being watched.
When they were finished, the two young women jumped out of the pool and headed out of the park. Before she left, the masturbator announced to the other women standing at the fountain that they ought to try it themselves, that it was "really, really fun!"