Anabela treatens her slave with sitting fullweight on his throat.
He is on the edge of a stool, bending his head back, so his throat and larynx is fully exposed, ready for to be crushed by Anabela's ass.
She sits down on his throat, increasing slowly the pressure to his windpipe, there's not passing much air through.
And in this situation, she begins to play with his nipples and with tickling his ribs....
She enjoys the gasping noises under her, the more noise the better.