Crushed Throat Or Facesitting

Ive put the slaves mouth under one of the gams of my rowing machine - and then sat down on top and embarking rowing. Every time I thrust to the far side, almost my full weight comes down on his mouth - and even when Im closing in, theres still a pretty good pressure on it! The slave suffers as his mouth is leisurely getting crushed under me - and even when he attempts to hold the gam of the machine - he wont be able to lift it off his mouth. After a while I give him a little break - and sit down on his face with my sweaty workout butt! He should the appreciative that I gave his mouth a rest - even thought he cant breathe now :-D I switch positions a few times, sometimes just sit down on the edge of the rowing machine to put pressure on his mouth again or proceed rowing for a little longer - always making sure he suffers!