Tracey sets a timer and spays some aerosol into the beam of a laser to illuminate its beam then breaks the beam with her hand to test the spanking machine applies three strokes then presses a button on a remote control to temporary switch the machine off as she walks over to the machine. Once in front of the machine she adjusts a stand with two metal strips along its top edge (and a neon bulb to indicate a voltage in excess of 80 volts is present) connected to a Tens unit so it is just out of contact with her pussy when she is on tip toe. Tracey fastens and padlocks leather cuffs on her wrists then places vacuum cups on both her nipples before padlocking her cuffs to a looped rope above her head that goes to an electromagnet where it is held until the timer switches off its power and she is released. Tracey wriggles into position then presses a button on the remote control that switches on the Tens unit and the spanking machine then drops the remote control on to the floor so she can not change her mind and what designed to happen will happen. With her wrists slightly behind her and the Tens unit encouraging her to move back with its electric shocks Tracy tries desperately not to break the beam of the laser but inevitable her pussy receives its first electric shock making Tracey jump back so her bottom brakes the beam of the laser to activate the spanker so it can administer the first set of three strokes onto her bottom. On tip toes Tracey tries to keep her pussy away from another electric shock and just forward enough not to break the beam of the laser but by the time she is released her arms, feet and toes ache, nipples are large, erect and painful, bottom is bruised and her pussy tingles from all the electric shocks A true pain slut!