Nipple play has never been easier! The Nipple Up! Vacuum Cups attach to your nipples without the need for extra accessories. Simply pinch them together, push them on your or your partner's breasts, and let go off of the cup to let it suck tight onto your nipple. This will not only increase blood flow to your nipples and make them swell, it can also correct certain types of inverted nipples. And they will not only feel great as you wear them - your nipples will become more sensitive even after you take the cups off.