Pump up your breasts to their maximum potential to increase size and sensitivity with these Pink Breast Pumps Pumping can increase sensitivity, enhance pleasure, and increase size. A firm cup with a soft rubber seal on the bottom ensures a tight seal for maximum suction. Simply place the cups over your breasts, and squeeze the finger grip pump to pump up your breasts to your desired size. Press the valve button when you are ready to break the suction for a quick and easy release.