You're going to stroke along with me, following my instructions telling you how fast and when to stroke. But today's jerk off instruction will be a little different than usual, because this time when I tell you to stop, I will order you to inflict pain on those balls and cock. You will have to slap them, tug on them, even punch them perhaps! Whatever I instruct you to do, you will follow my orders, no matter how painful. It makes me feel so good knowing what an obedient little worm you are. And then at the end there's a cum countdown which ends in me allowing you to cum. Don't think it's over though, as I fancy indulging in a teeny bit of post-orgasm torment, ouch!