Jack couldn't believe what was happening. He knew exactly what Ellie's game was. The more he gave in to her blackmail, the more blackmail she would be able to hold against him. She showed him the picture she had just taken; him sat on his bed a poofy adult nappy. It was humiliating.
"Just how long do you think you're going to get away with this?" Jack asked, trying to come across a lot bigger than he looked. Because at the moment, he looked like nothing more than a whiny little baby boy in a diaper.
"How long do you think it will take Mom to find out? You're not exactly being subtle, are you?"
Ellie agreed. She wasn't being subtle. But she wouldn't have to be. She had a plan.
"Has it not occurred to you, Jacky, that it's the school holidays for the next four weeks?" Ellie said bluntly.
Jack's heart sank. She was right. And with their mom working 9-5 everyday Jack would have no choice but to spend eight hours a day for the next month doing whatever Ellie told him to.
"And besides," Ellie continued. "If mom finds out that you were teasing me about my problem, she'd probably just tell me to put these pictures up straight away regardless." She said smugly. Ellie and her mother had always been close, and her mother had always said if something teased her at school they would never feel the end of her wrath.
"Anyway." Ellie said as she started fiddling with something in the bag she had next to her on the floor. "We can't be having a day of fun without starting with a healthy breakfast." She produced a large baby bottle filled to the top with milk.
"Baby needs to get his milk so he can grow up to be big and strong." She said, making a muscle man stance.
Ellie took the bottle over to Jack, who was sitting there in nothing but his diaper, unsure how to tackle this situation. She popped the nipple of the bottle into his mouth and sat down on the bed next to him, putting him into a nursing position. He reclined back and rested the back of his head in her lap. Seeing his sister from this angle was so peculiar. She looked so much bigger from down there.
"Who's a good little Jacky?" She cooed as she teased his mouth with the nipple of the bottle. "If you finish it all right away, I'll give you a present."
Jack was wary of this, but again was eager to get into Ellie's good books. He needed her to stay happy with him. So he sucked eagerly at the baby bottle and drank it dry. The milk was warm and creamy, but had a hint of something else about it...
"So what's my present?" He asked curiously. Ellie frowned at him, and raised an eyebrow expectantly.
"So what's my present, mommy?" He added, looking rather ashamed of himself. If he were a dog then his tail would have been between his scared little legs.
"A wet diaper!" Ellie cheered as she stood up and started filming with her phone. Jack looked at her in confusion. What did she mean?
And then he felt it. He felt the agonising wrench in his bladder that meant soon, whether he wanted to or not, he'd be emptying it wherever his dick was pointing. And right now it was in his diaper.
Jack looked down in disbelief, whilst Ellie looked on in glee. He felt every muscle in his stomach suddenly relax, and they both heard the tell tale splash and trickle of a little boy filling his diaper.
"No! This can't be happening!" He gasped as he saw a yellow stain start to emerge on the front of his padding. Ellie was giddy with delight seeing her brother reduced to this, and catching it on film no less.
The padding between Jack's legs began to swell, and the material that was once so thin and crispy had become bloated and squishy.
"How does that feel, baby Jacky?" Ellie giggled to herself. She had already wet her pull-up this morning, and knew that the sensation she could feel at the moment, the warmness around her crotch, Jack was feeling right now, coupled with the fear of having lost his bladder control.
"Don't forget, little baby," Ellie said darkly. "I own you."
Jack felt so humiliated. So humiliated and scared. How long had he lost control for? A day? A week? Longer? He'd have no choice now. Wearing diapers wouldn't just be a punishment for him. It would be a necessity. Ellie was holding all the cards now. His mother wasn't going to rescue him, his girlfriend Michelle wasn't going to rescue him. He would just have to keep playing it sweet for fear that if ticked off, his little sister could upload a video of his wetting a diaper at any point she wanted.
"Right then, Jacky." She said once she was sure he'd finished flooding his diaper. And boy did he flood it. The now yellow material was ballooning, and moisture was forming on the outside of the plastic of his diaper. "It's time for a diaper change, don't you think?"
Jack looked at her evilly as he sat down again, making his diaper squelch beneath him as he laid down ready for his change. Ellie raised her eyebrow again and then wagged her finger at him.
"No, no, no, Jacky. You're staying in your wet diaper as punishment for drinking your ba-ba too slowly and talking back. You're going to give ME a change."
Jack got up unsurely, not entirely sure if Ellie was joking or not. But when she peeled off her skirt and put a fresh adult diaper in his hand to go in place of her pull-up, he realised she was in fact deadly serious.
"You want me to change you?" He said as he started unfolding the diaper in his hands.
"Yes, yes I do." She smiled with a wink. As she stood there before him he could see her purple pull-up was swelled just as much as his diaper.
"There's no way I'm touching your pissy pull-up." He laughed nervously. "That's fucking gross."
Ellie turned and looked at him carefully.
"Excuse me, baby Jacky? Did you just swear AND not say mommy all in the same breath?"
Jack gulped.
"Well since pissy diapers are 'too gross' for you," she said approaching him and taking his right hand in hers. "You can have another punishment."
Ellie took his hand and pressed it against the back of her diaper; the seat. Jack felt weird touching his sister's ass, but the look she had given him told him not to fuck with her.
Jack didn't realise what was going on until Ellie squatted a little and gave a grunt.
"Oh yeah, that's the spot." Ellie laughed as she felt her bowels loosen and a slow log of shit fill up the back of her pull-up. Jack went to pull his hand away, disgusted, but Ellie grabbed it and pressed it harder against the pull-up and her shit. He could feel the already wet diaper getting fuller and fuller as Ellie released last nights dinner into the back of her nappy. She loved that her brother was squirming uncomfortably behind her, feeling ever ounce of mess that was coming out of her asshole.
Once Ellie was finished, she gave Jack's hand a hard squeeze, making him squeeze her shitty pull-up with his hand. Jack retched when he saw a little shit squeeze out of the back of the elastic leg hole and drop onto the floor.
"Don't ever try to tell me you've got it bad, Jacky." Ellie said slyly, enjoying the feel of the hot mess in the seat of her diaper, squished up between her butt cheeks. "Because I can always make it a thousand times worse."
"Now clean that shit off the floor and change my diaper, little baby."
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