This mistress did not like how her slave smelled. He did not take good care of himself and she did not like that. She had to punish him and she did so cruelly. She forced him to learn a lesson by hand smothering him and choking him in the process. He was so afraid of her that he chose to do the right thing and improve his cleanliness to avoid such punishments in future.
Mistress Amy has a big ass and she loves to smother. She does it for fun and not because someone has done something to piss her off. She has a lovely ass and it is what she uses as bait to get people to smother. They love her ass and want a piece of it and they get that piece by licking and smelling it while she smothers them with it.