Sit down, step-son, we need to have a talk. Just the two of us, Step-Mom to Step-son. You see, I know you've been peeping on me in the bathroom, I can hear you when you're hiding in the shower trying to be sneaky. I know you're watching me piss and I know what you're doing with yourself while you watch. You should really try to be more discreet.
The thing is... I don't mind. In fact, I'm really quite curious about what exactly it is that gets you going so much about the idea of your stepmom peeing on the toilet. What if I were to take off my panties and pee for you right here, would tha...

Sit down, step-son, we need to have a talk. Just the two of us, Step-Mom to Step-son. You see, I know you've been peeping on me in the bathroom, I can hear you when you're hiding in the shower trying to be sneaky. I know you're watching me piss and I know what you're doing with yourself while you watch. You should really try to be more discreet.
The thing is... I don't mind. In fact, I'm really quite curious about what exactly it is that gets you going so much about the idea of your stepmom peeing on the toilet. What if I were to take off my panties and pee for you right here, would that turn you on?
I can see from the bulge in your pants that it does.
Take it out.
You heard me, I want to see your hard cock. That's a good boy, now start stroking it.
If you're a good boy and stroke your hard cock for me, step-mommy will pee for you and help you cum.
But you have to be a good boy and cum while I'm peeing.
And you better not EVER mention a word of this to step-daddy.