God, I once tried a product called “Deep Cold” or something in a similar namesake. It was a blue gel, and its purpose was to apply it to a sore muscle, and its effects were first a deep penetrating hotness, which lasted for a couple minutes, and then, a slow transition to a deep penetrating cold feeling, which lasted for about roughly the same time as the hot part.
So, alternating hot and cold, hot and cold, hot and cold. Lasted for about 30 minutes. I could absolutely do nothing except grab and squeeze my dick and hop up and down, all the while swearing like a bitch and dreading the feelings of a torchblower frying my noodle silly, and then the icy popsicle sensations. After it was all over, I just collapsed and said to myself, “I wonder how the old lady would like a little on herself cause look what it did for me?” I sure would like to see her squirm all over the floor.
For the fearless out there, go ahead and try it out! :D