The slave's cock gets an electrified steel tube inserted in his pisshole. It goes in deep, untill his prostate is touched. Then the electricity is put on (do not try this at home, this is very specialized work). After a while, the prostate jerking is stopped and the very sensitive spot gets a hard whipping. Then another electric device is laid ready, shocks will go through the cock and balls of the slave! Hear him shout! Free preview, 11 minute clip.