Boney Mike was scared of Sotho's massive ass. So to test it out, She started out by bouncing her ass on him a bit before releasing it all on his face causing him to get sucked into her massive butt. She smothers him and cuts off his air supply showing him who's boss and leaving it up to him to find his own air.
He struggles till his dom is tired which then she decides to lay on top of him and hump him, face fucking him and smothering him with her thighs, pussy and ass.