Ronja, aka Lady Amy, want to test and improve her slave's breath-hold skills.
She sits down on his face, uses a stop-watch and counts loud the seconds without air.
She presses her crotch-area hard against his mouth and nose for ensuring that there are sealed properly all ways for his oxygen-supply.
During the clip, she changes the direction to reverse, now his nose is deep in her ass-crack....
Take a deep breath!... first polluted air... then no air... what's better?
Any way, Ronja want to have fun with her slave-toy.