Leah knows that if she wants to hammer home her new preference for diapers, she'll have to "have an accident" without Tina noticing. The second that Tina spots any hint that Leah is about to pee or poop, she'll grab Leah and rush her to the bathroom. Luckily, she has a plan.
Ten minutes into the movie, Leah feels a need to pee.
"I want a drink, want something?" she asks as she gets up off the couch. Tina shakes her head. Leah walks into the nearby kitchen and gets a glass of water. As the sink is running, filling up the cup she grabbed, Leah pees. The sound of the sink covers up the hiss from wetting her diaper. Then, to top it off, she drinks from the glass and sighs in relief.
With her diaper pleasantly warm, Leah heads back to the living room.
Half an hour after that, Leah feels a pressure in her tummy. A fart tries to make its way out, but she clenches desperately to keep it in.
"Hey, Tina, do you mind making us some popcorn?" she asks. Tina smiles at her.
"That's a great idea, Leah! I'll go do just that!" Tina gets up and goes to the kitchen. Once she's a safe distance away, Leah lets a few farts escape. But only after the popcorn has begun to loudly pop does Leah begin to push a log into her diaper. Her grunts are covered up by the popcorn popping. By the time Tina gets back, Leah's diaper is packed. And she couldn't be happier. She adjusts how she's sitting, not caring about the mess spreading over her butt from the movement, and waits for Tina to smell that she needs a change.