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I've trained my step-son to be an obedient fart filter and ass cleaner for all of step-mommy's sexual needs. He knows that I have lots of "special friends" aka bulls I invite over to fuck me silly right in front of him while he watches in chastity. Being much younger, smaller and weaker than Step-mommy's special friends means that he has no power to control what happens to him. While I have him service my asshole and suck out my farts, I remind him how tall, strong and masculine all my special friends are. I make him stand up so I can fart on his chastity cage and remind him that his dick is too small to ever lose his virginity. Someday he will move out on his own and he will need the values I instilled in him to make it out in the world. He will be subservient to all women, and if he ever finds himself in a relationship, he will offer himself up as a cuckold from day 1. That is the only future he has. I tell him I am going to loan him out to all my friends and they will use him as a fart cushion too. My words make him break down and cry, so I sit on his face and smther him under my ass until all my farts have passed into his lungs. He struggles until going still due to lack of oxygen as the scene fades.