this is for the professional slaves, look at : http://www.mistresswhiplash.com/
video is called : wl1031 : Harsh Treatment
storyline : My slave Red is restrained in the dungeon, ready for my latest cruelty. After attaching some clothespeg zippers to his sides to bite in, and my tightest nipple clamps, I really put the frighteners on Red by lighting up some sparklers and holding them dangerously close to his cock and balls. The sparks fly, with white hot embers hitting his flesh until he is wailing. But the harsh treatment doesn't finish there as I really want to get all the entertainment I can out of Red, so I decide to cane his cock all along its length with my hardest, thinnest and most stinging canes. There is just time to give his tender nipples the same treatment before I remove the peg zippers, which after half an hour, have really bitten into his tender flesh! Poor Red really does look a state by the time I'm finished with him!