Vanessa makes her power play

The drive home passed in silence, Lauren still processing the bizarre role reversal that had just occurred. Her little sister had changed her diaper in the backseat of a car and threatened to spank her if she didn't cooperate. And she had complied. The Lauren from a week ago wouldn't recognize her now.

When they arrived home, Vanessa immediately took charge. "We need to finish cleaning your room and wash all those soiled clothes and sheets. Come on."

Lauren followed meekly, still subdued from the humiliation in the car. For the next hour, they worked together, bagging up wet sheets, sorting through piles of soiled clothes, and disinfecting Lauren's mattress as best they could.

"This would be easier if we had a plastic sheet to protect your mattress," Vanessa commented as they worked. "We should get one."

Lauren winced at the suggestion. A plastic sheet, like a toddler would have. But she couldn't argue with the logic, not when her mattress was stained as badly as it was.

By early afternoon, they had made significant progress. Lauren's room no longer smelled quite so strongly of urine, and most of the soiled laundry was cycling through the washing machine.

"I'm starving," Vanessa announced. "Let's take a break for lunch."

In the kitchen, Vanessa moved with confidence, preparing sandwiches and setting out plates. She handed one to Lauren along with one of the drinks from the refrigerator.

"Here you go," Vanessa said. "Eat up."

Lauren looked down at the drink, recognizing it as one of the ones she'd been consuming over the past few days. "You know, since you're here now, you could try one of these breast enhancement drinks yourself," she suggested.

Vanessa smirked, shaking her head. "No thanks. I gave those to you, remember? Besides," she added with a teasing glint in her eye, "you clearly need them more than I do."

Lauren's cheeks burned at the casual jab about her flat chest. With her hands full holding her plate and drink, she couldn't stop Vanessa when her sister suddenly lifted the back of her dress, exposing her diapered bottom.

"Just checking," Vanessa said matter-of-factly. "Still dry."

"Stop it!" Lauren protested, nearly dropping her food as she tried to pull her dress back down. "I don't need to be checked! I can change myself if I need to."

Vanessa raised an eyebrow. "Oh really? You can change yourself?" She crossed her arms over her chest. "Is that why your bed is soaked through with urine? Is that why you developed a diaper rash you didn't even realize you had it until I pointed it out?"

Lauren opened her mouth to respond, but Vanessa continued.

"You can't even see where the cream needs to be applied, Lauren. You didn't even know you had a rash. And let's not forget I've already changed you twice today." She ticked the points off on her fingers. "And I've already seen everything there is to see. Your flat chest, your hairless crotch, your rash, everything."

Lauren felt her face flush hot with humiliation. She tried to form a coherent response, but the words wouldn't come.

"So here's how this is going to work," Vanessa said, her voice taking on an authoritative tone Lauren had never heard from her before. "From now on, you will tell me when you have an accident. You will let me check your diaper whenever I want. You ask me to change you when you need it."

"You can't be serious," Lauren finally managed.

"Oh, I'm very serious," Vanessa replied. "And if you have a problem with all that, then you won't be wearing anything that covers your diaper around the house. Nothing. Just like an actual baby."

Lauren stared at her sister in disbelief, her mouth opening and closing like a fish out of water. This couldn't be happening. Her little sister couldn't be dictating terms to her like this.

"You—you can't make me do that," she finally sputtered.

"Can't I? Let's think about this, Lauren. Right now, your little problem is a secret between us. No one else knows about it. Not Mom and Dad, not your so-called friends, not all those boys you like to lead on or flirt with, not a single person at school.” She paused, letting the words sink in. "But it doesn't have to stay that way."

Lauren felt like she'd been punched in the stomach. The air seemed to vanish from her lungs. "You wouldn't," she whispered.

"Wouldn't I? After all those years you tormented me? After all the humiliation you put me through?"

Lauren fell silent, her mind racing. She couldn't believe Vanessa would actually **** her into letting her check and change her diapers. Of all the **** Vanessa could take for years of torment, this seemed... strangely tame.