I've put the slave in the smotherbox and bound his hands to the box as well - so he can't move at all. Then I told the slave that I'm going to sit down on his face and smother him under my ass - and that he can snap his fingers when he needs to breathe and wants me to get up ... silly slave ... he really believed I'd get up :-D Sometimes I simply ignore his panicky snapping - sometimes, I trap his hands between my calves and thighs - so he can't snap at all :-D I enjoy how he's panicking more and more under my ass as he gets afraid that I might not get up in time!