British terms used rather than American.
Step-Mommy catches you with her dirty knickers, have you been wanking your willy whilst sniffy Step-mommy's fanny juice? Well that's it, you're going to have to be punished, take down your trousers and get over Step-mommy's knee. Step-Mommy is going to have to spank your bare bottom raw.
After a good spanking, Step-mommy starts to feel bad. You are a good boy really, let Step-mommy feed you with her booby milk, and kiss that red bottom better. Step-Mommy sees you getting hard and starts to wank your willy. Such a good boy, you make a mess for Step-mommy, and she decides to treat you by letting you fuck her cunt. You want Step-mommy's wet sopping fanny don't you? That's it, climb on top and let's fuck.