Get down on your knees with your ass in the air and your hands behind your back, with your face pressed into the floor. Make sure that both of the heavy objects are now lined up on the floor behind your feet.
Now, without hesitation your are to kick back on one of both of the objects as hard as you can. Feel the string tied around your cock or your balls burn into your skin as the object is kicked away from you. For the next couple of minutes, you are to repeat this procedure, moving to wherever the objects have moved. However, don't take your hands from behind your back, and your face is never to leave the floor. You are to scoot around on the floor with your face pressed into it at all times. If you are so willing to humiliate yourself like this, you don't deserve to lift your head off of the floor.
Go on slut, get kicking. Feel your cock and balls being ripped from your body.