I was texting on SP with a Domme from NY who told me she liked to apply Tiger Balm to a subs balls at the end of a session knowing they would have to sit in the car/train with it on all the way home before they could wash it off. I of course then went to like 4 stores to find it and then applied it to myself with her long distance instruction, graphically describing the progress/feeling. Pretty intense stuff, but quite fun.