This guy was shocked to be dominated with stinky farts. He had messed one time but he did not think that it would lead to him being humiliated and tortured the way he was. That is why the mistress went out of her way to force him to smell her stinky farts and he choked on them as he smelled them. The mistress let him get some air and then he had to sniff them again.
Oh my, a poor slave is going to find out his worst mistake ever was thinking he could handle these two brutal mistresses. The slave thought he was going to be able to handle what gets dished out to him, but he is going to learn very fast that the two mistresses are hardcore and more than extreme. The pain he will endure is going to be so bad.