I prefer a boar bristle brush - it's the only tool I need. In the hands of an expert the lightest motion across the skin produces a lovely pink color. And after that color ripens to red, another VERY LIGHT application brings darker color and measurable heat. And if I do that while you are sucking my cock, I will reward you with slapping of your pussy. Again, light to start, and then heavier and faster until we both cum