I'm an evil science teacher. My student has misbehaved. To teach him a lesson, I strap him down to the spanking bench and paddle his ass. After that, I admit, my curious side gets the best of me. I lay my student down on the bed and let the machine fuck his ass. He certainly seems to enjoy that, so I strap a tens unit to his cock and balls, and sit down to enjoy the show 😈 Hurting him turns me on so much, I pull out my hitachi wand and orgasm.