Touching step-mommy's boobies
Your step-mommy Vanessa has the biggest natural breasts and you are fascinated by them.
When she comes into the nursery to change your diaper she notices you cannot keep your eyes off them especially as they are almost falling out of her dress with the top buttons undone.
She leans over to feel your diaper and her breasts are very close and you still cannot help but stare.
She asks would you like to feel them while she changes your diaper. If you are a good boy she will let you do just that.