I start this session with a warm up by flogging my sub. Then, once in a strait jacket I put his pathetic cock and balls in a metal device. This device stretches his balls while simultaneously crushing them with spikes. Every turn of the screws stretches and crashes further and further. I put an electro attachment on the head of his cock that goes into his urethra. Now mistress sits back and plays with the voltage of the electro machine and laughs at this slaves agony.