Jill and Sue, wearing only nylons, bind the slave on a bench, for sitting on him.
First Jill sits on his face, lifting her feet off the ground for really fullweight facesitting.
Then they change places and Sue sits on the face and Jill teases with her feet his stomach.
To the end Jill is humilating him with squeezing his neck, spitting in his mouth and hand-over-mouth-breathreduction.