Custom - During your step-son’s birthday party, you and he sneak away to one of the bedrooms, so you can give him a special birthday pegging. You put him on his back so you can stroke his huge dick while you fuck him with your strap-on. You keep telling him how “proud I am of my step-son’s giant cock and how well he takes a pegging from his step-mother.” You also warn him not to moan so loud, because it would be if his friends saw him getting pegged by your step-mother. Nevertheless, one of your step-son’s friends and the friend’s girlfriend hear the noise and wander in. You can tell they are both turned on, so you invite them to stay so they can watch and masturbate. You ask if they ever seen a step-mother fucking her step-son’s ass before and whether they’ve ever seen a cock as big as your step-son’s, which of course they haven’t. The friend has a nice cock too, so you tell him to start fucking you, while his girlfriend takes over pegging your step-son. You explain to your step-son pegging him made your pussy dripping wet, so you need a cock inside you. You make your step-son promise to show them a hands-free cum-shot. You can see they’re skeptical, but you warn them it will be huge. You tell your step-son to “kiss stepmommy while I’m taking your friend’s dick,” which makes the friend creampie you. When you describe the creaminess, it makes your step-son blow a huge hands-free load that splatters all over the shocked girlfriend, which makes you laugh at her. Then you look up and notice the rest of the party is applauding. That turns you on again, so you suggest to your step-son that he should let the rest of the girls take turns strapping it on and running a train on him, while you let the rest of the guys take turns fucking you. Then you tell your step-son how much you love him and how this will be the best birthday party ever, for both of you, ending there. Your attitude towards your step-son would always be loving, with no humiliation. You just really get off on pegging him, because he enjoys it so much too.