Lady Amy (aka Ronja) has her slave on a high bench, ready for to train a fullweightsitting-cushion.
She steps over his face, teases him with shaking her ass, then immediatly she decends her ass and his air-supply has gone ;-)
She lifts her feet off the ground for giving him the maximum ass-pressure to his face.
Because her non breathable "textil", respectively PVC-trousers, she has the total controll over his air-supply, and she uses for educate him.
Letting him breath with counting his sips, the she decends quickly and he must endure an oxygene time of her choice.
For making this game more interesting, some breaks with buttdrop, fullweight throat-windpipe crushing, or sitting with only one of her bony ass-cheeks right on his nose, and the again landing on his face.
To the end she spits in his mouth, reward for his service as her seating-toy
Lady Amy, sadistic, dominant and a little bit cruel, that's her life!!!!