When you have the perfect innocent meatdoll GF, you can convince her of anything, and she'll just nod along, not really understanding but trusting you. What happens when you betray that trust? A lot of mischievous groping, that's what. But what does she know? She's just a dumb cow.
A nice holiday prompt about April Fools! Inspired by >>378479175 and the posts it replies to (one of which is mine, not to toot my own horn).