Growth Swap
OK. Here’s a quick version of that. It’s weird writing with these ages, though, because it’s not a direct “swap”, which makes it hard to come up with the logic of how it works. Plus, you mention a big sister, but she swaps with her mom? I demand my weird sexual fetish porn plots have internal consistency!
“I wish I was all grown up, and I could take care of Suzie and Mommy,” Cindy said, gazing out her tiny bedroom window into the night sky. Cindy was just seven years old, and the youngest daughter of her family. Her older sister, Suzie, was quite a bit older, at 16, and both went to school and held down a part-time job to help pay the rent. Her mom, Julie, worked two full-time jobs to make ends meet, both relatively menial and unpleasant, so they were both always exhausted.
Julie and her husband had only wanted one daughter, but when she got pregnant with Cindy, they’d been surprised and delighted. Two weeks later, her husband had a massive heart attack at his desk and suddenly Julie was back in the working world with a nine-year-old daughter and another on the way.
Ever since then, she’d worked hard to try and keep her family together, and while Cindy and Suzie knew that their mother loved them, they both were also keenly aware of how hard she worked, and how tired it made her. Hence, Cindy’s idle wish to the stars.
High above her, one of those magic stars heard her wish, and peered down at the little house. It twinkled and worked its magic, the ancient sort of magic that only distant stars know, and then waited for the results.
Back down in her room, Cindy had changed into her oversized sleeping t-shirt laid down in her little pink bed. She was just about to fall asleep when a sudden flush of warmth filled her body. She moaned and tensed her body, which was aching in odd ways.Alarmed, she threw off the blanket and sat up.
Before her eyes, she could see her legs growing longer, her feet inching along her bed. With a shout, she lept out of bed and ran to her mirror. “My legs!” She could see more and more of them as the hemline of her baggy t-shirt rose steadily up her thighs. “I’m getting taller!” She held out her arms, and was shocked to see her fingertips inching further away from her face. “No, I’m getting older!”
There was no denying it; Cindy was now no longer seven but much closer to being a teenager. “I’m almost as old as Suzie!” Cindy said, somewhat prematurely. She was just twelve, maybe, but already showing signs of being a real beauty, her strawberry-blonde hair lengthening from a demure pixie cut to a longer wave of shimmering volume; her limbs thin and shapely, even as puberty was just starting to kick in.
The t-shirt kept climbing, now resting just below her hips. Cindy watched in amazement as two little hills started to rise beneath the cartoon rabbit design on the shirt. “Breasts…!” she said, and then reached up and cupped her new chest with her hands. The five-foot-three fourteen-year-old didn’t even notice as her shirt’s hemline inched past her hips as she played with her new boobs. She’s always looked up to her mom’s decent-sized chest, and Suzie had let Cindy “play” with her own D-cup bras, so Cindy knew that the breasts forming on her chest were pretty big.
And so was she! Cindy looked up and realized that she was definitely taller than Suzie now, maybe even taller than her mom! The seventeen-year-old pulled off her t-shirt and stood nude before her mirror, taking in the sight of her tall, slender form. Everything she associated with adults was there: she was tall, she had big boobs, she had a very skinny waist, and a big, fat butt on wide hips. “The boys are going to love me,” she said, shaking out her long, wavy hair.
“And I feel… different,” she said, unable to put her finger on some of the mental changes that were taking place in her still-maturing mind. She crested six feet tall and turned to look at her room, which she realized was changing as well.
Gone was her toybox, gone were the little pink dresses and frilly bedspreads. Instead, her room was the room of a smart girl in college. A laptop sat on a desk that was strewn with papers next to a bookshelf stuffed with books. Her bed, nice and long for a tall girl like herself, was otherwise simple. On the walls, pictures of boy bands had been replaced with concert posters for artsy bands that Cynthia found she could name at a glance.
“I’m… Cynthia now.” Her full name, the name that mom had always called her when she was in trouble – that was what she went by, had started going by in high school. More memories flooded in, of years of schooling, friendships, makeouts… the twenty-one-year-old still blushed when she remembered sneaking a boy back into this room (when her mom wasn’t around) for some hot-and-heavy. He’d eaten her out that night, then they went all the way in his car two weekends later… even though he had been disappointingly small.
“Wow!” She said, as all this and more sluiced through her mind. “I’m a real adult now!”
“Cindy? Are you OK?” The door opened, and in walked Cindy’s mom, still the same as she had been, in her mid thirties, still bone-tired looking. “…Cindy?”
“Hi mom,” Cynthia said, proudly. “I grew up.”
“But, what… how…?”
“Shhh, don’t worry,” Cynthia said, stepping forward with her arms outstretched. She was acting on instinct now, driven by something she wasn’t sure about. “It’s OK.”
Julie wavered for a moment, then stepped forward into her taller daughter’s embrace. Immediately, they both felt a jolt of energy pass through them. Cynthia kept Julie pressed tight against her body. “It’s OK.”
Julie’s mind began to stop racing as she hugged her daughter. It was weird, yes, but it felt… right. She barely noticed as their arms started to shift, Julie’s face no longer so much as pressed against Cynthia’s neck as buried in her cleavage.
The years started to melt away from Julie’s brow. Soon, she was back in her twenties, a young, blushing bride; then into her teens again, a popular but academically lackluster student.
“I’m not your daughter anymore, Julie,” Cynthia said, reassuringly. “I’m your older sister, right?”
Her voice had the weight of the truth, reverberating around Julie’s head. “I’m the… youngest sister?”
“That’s right, I’m taking care of all three of us.” Poor Suzie, Cynthia thought, she was now the middle child!
“How?”
Cynthia thought about it, then the memory came to her. “I worked for a start-up, and they got bought out… and I made a lot of money!” For a moment, the little seven-year-old inside of her was back again, amazed at the sums of money now in her name. “We’re all safe now, and you and Suzie don’t have to work anymore!”
“OK, big sis, I trust you.” Julie pulled back out of her sister’s hug. “But put some clothes on, you’re all naked!”
The spell that had been keeping everything calm broke. “Ah! Get out! Let me get dressed!”
“Cynthia walks around her room naked!” Julie yelled as she ran out of the room, the door slamming behind her.
“Ugh!” Cynthia made the requisite grunt of disgust at her little sister’s immaturity, but immediately softened her expression. After all, just a few minutes ago, that had been her.
She turned to the window and gazed up at the stars, her full breasts heaving. “Thank you,” she said, then turned and got dressed.