I was waiting for the Dirty Doctor he had some new equipment he wanted to test out and as usual I was to be the Guinea Pig, he arrived and he showed me an electro stimulation device with some nipple suction cups he wanted to test so I loosened my uniform and lay back on the bed then the Doc sucked my nipples into the cups with the pump then connected the electro stimulation device and switched it on I felt a strange pinging sensation as the device sent an electrical charge through my body, the Doc then gave me the controller to try the different settings while he observed.