Post-workout Sweaty Ass Facesitting

I pin down the slave on the floor using my sweaty feet - but I wont smother him under my feet today - Ill instead sit down on his face with my full weight and smother him under my sweaty ass! The weight of my body presses his nose deep into my ass crack and theres no way he gets a single whiff of air. After a while I tell him that I wont get up - hell have to lift me off his face if he wants to breathe! But after a while, he starts struggling so much, that I slip off his face - and of course I cant tolerate that! I bind his hands together of his head to make it even harder for him - and then sit back down on his face and continue to smother him.