3, wear your butt plug under your jeans while grinding a kitchen counter or piece of furniture. If possible, do this at someone else's house or in a store...
3, each one starting off by gently stroking yourself with the lightest touch possible while you squeeze your pussy muscles. Give yourself a long time to do this - even if it takes hours. Gradually, very gradually, build but make the edge last as long, and keep your touch as light, as you can manage. Keep building and squeezing your muscles and stroking the entire time.
