Trampling My Slave On The Stairs

Normal trampling is too boring to please me today so i order my slave to lie down on the stone stairs and manacle him to the railing. Then I use him as my human stairs - i walk on him just like id walk on the stairs. All over his gams, chest and even his head. Guess its kinda painful for him lying between my sneakers and the stone stairs - but thats not exactly my problem :.