After a while Nurse AJ strapped on some kind of electric shock machine to my dick. Turning it on, the machine made a lot louder noise than the sensation it was putting out. He would use his hand to jerk me off slowly with the machine going and then cupped my balls with his other hand. After a while admitting that he had to take off the machine and just went to jerking me off by hand. AJ squeezed out all the cum, and told me that he would take some samples of my cum representing testing.