"Some tape on the vacuum hose to protect the soft flesh. My neighbour used to love having this done while also having a vibrator resting along her cleft. If you hold the hose nozzle just off the flesh it causes turbulence which makes the clitoris rattle. There's actually a toy, an attachment called the Vortex which has a simple movable barrel to adjust the amount of suction lost to the air. It sits over the clitoris so you don't need to make skilful adjustments yourself. Difficult to explain but it works and the noise of the vacuum cleaner masks the screams if she is cuffed to her bed."