Slave's hands crushed while I'm on the phone

While i'm on the phone with a friend - the slave's kneeling on the floor and i walk back and forth over this hands and fingers. the mean tread and the hard heels of my boots cause him a lot of pain - but i instructed him clearly to be quiet and not to disturb my phone call. and he tries his best to keep quiet, although that's getting more and more difficult as i continue to walk and stand on his hands, crush his fingers under my heels and leave imprints from the boots' treads all over his hands! after a few minutes, my friend notices the screams of pain in the background, and i explain to her what i'm doing right now ... so i make the slave tell her on the phone that it's his free will to be tormented by me! and since she's pretty fed up with men currently ... i spontaneously invite her to come over and give the slave the same treatment!