It is useful to have my chastity step-son next to me when I am touching my pussy. If I get horny and need it to be licked tenderly for an even better orgasm, I can just use his mouth to get off. Because he is in chastity, it is safe knowing he can't get any pleasure from it. He sucks on my big boob until I'm ready to be worshipped. He obediently goes between my legs and begins to pleasure his horny step-mommy. He has to serve me no matter what because I have the keys to his cock. That means even if I fart a lot, he has to continue licking no matter how bad it gets. I'm very gassy and rip lots of deep rumbly farts while moaning and holding the slave's head in place between my massive thighs. He's trapped in the stench and juices, working hard to make his step-mommy happy. What a good boy. I work myself up to a big orgasm, gushing in the subservient step-son's mouth. After I cum, he is placed back beneath my breast as I emphasize the importance of keeping him in chastity. I need a good pussy licker, so that's just the way it has to be.