Miss July sits on her slave's face, while she's doing some phone-calls. The slave's head is on a bouncy gymnastic-ball, so Miss July's seat is not very stable.... but bouncy... a bouncy face-saddle can make fun! Some POV shots at the end let you be inside this video-clip.... and receive the nice treatement.
Carrie, tall and relatively heavy, sits reverse on her slave's face, throat and chest. She begins on his face, decends slowly and streches out the legs for sitting with all her weight. He struggles because lack of air, so she moves on his throat and let him hardly breath with her 170+ lbs on his windpipe.