One part of the training of my office slave is that he must get used to be under my feet. A lot. I work a little with his face as my footstool under the desk and when I finish, is time for a cigarette break. I cross my legs with his face underfoot and I smoke slowly, using his mouth as an ashtray. When I finish my cigarette, I make him eat the remains and I keep his face under my feet, is actually comfortable!