If you are looking for nipple cups that are powerful yet still easy to use, the Demon Orgasm Ikase Nipple Cups are a great choice! Not only does their vacuum suction stimulate your or your sex slave's nipples, it also increases blood flow and makes them more sensitive after you take them off. To make the cups work their magic, simply place them on the body part where you desire some stimulation and then carefully turn the knob to the right to remove the air...
The Demon Orgasm Ikase Nipple Cups feature: