"I don't want to go to work" 17 year old Olivia Sanders complained "This sucks…I can't believe Mom made me get a job this summer"

"I think she told you that gas isn't free so if you want to actually do anything, you have to get a job" Her 10 year old sister Caitlin said in a sarcastic voice from the couch.

Liv shot her little sister a killer glare. Through gritted teeth and squinted eyes she retorted with "And what exactly are you doing today?"

Caitlin sat up and with a smug, satisfied look in her eyes announced in a bubbly sing song voice "I'm going over to Audrey's house to go swimming"

"God you suck!" Liv shot back "All of my friends are free to do whatever they want and go wherever they want and I'm fucking stuck making God Damn sandwiches in a Subway all day. I swear I can't do anything!"

"Aw…I feel so bad for you" Caitlin's sarcastic side reappeared "I mean it's not like Mom and Dad got you a car…a phone, a laptop and no real curfew when you go out like 6 nights a week. Quit being a big baby! You work like 3 days a week and it really seems like you enjoy spending the money you make" she sat up.

"That’s not the point!" Olivia protested.

"Well then what is the point?" Caitlin asked.

"The point is that it's summer break and I shouldn't have any responsibility…just fun! I'm going into my senior year. Soon I won't even have summer breaks. Just hang out with my friends. Just sleep in and lay around on the couch with my feet up! Just like…" she paused and their eyes met.

"Just like me huh" Caitlin finished for her big sister.

Olivia just stared and made a strained face running her tongue over her teeth but keeping her lips closed.

Caitlin laughed "Oh! I would gladly trade places with you if we could sis! I would give up laying around and going swimming for a car, a phone…being a Senior in high school! Just say the word and I am there!"

Hearing the exact words somewhat shocked Olivia. Putting it that way. "I guess that is what I was wanting haha" she played it off laughing nervously "Just thinking about being a kid again"

"All the things you would give up just to be lazy. You would definitely get several years of summers in return…7 extra ones in fact" Caitlin goaded her. "You've still got time before you have to go to work. Just pretend it's real…we really switched places. I'm now your big sister. I'm 7 years older than you are. I'm 17 and you're just 10"

"No! Cut it out Cait!" Olivia said.

"Well that sounds like you already are my little sister and I'm picking on you" Caitlin laughed.

"Oh shut up!" Olivia protested as Caitlin rearranged herself on the couch, sitting cross legged now and patting the cushion next to her.

Olivia sighed and took a seat next to her little sister "Fine!" She sighed disgustedly.

Caitlin just bounced and giggled "Oh it's not that bad but I'm going to need that haha!"

In a flash, Cait swiped Olivia's phone out of her hand.

"Hey! Give me back my phone!" Olivia reached for it but Caitlin spun and blocked her and held it out far enough "Ah, ah ah! You're 10 now and you know Mom and Dad won't let you have a phone until you're 12" Caitlin said.

Olivia sighed "Fine…we'll play your little game" she said shaking her head.

"Hey you were the one who brought it up. If you don't want to be 17 anymore, I will straight up trade ages with you. You can be 10!"

Olivia didn't say anything. She lay back and closed her eyes but despite herself, her brain asked the question "What if you and Caitlin actually did swap ages? What if she were 17 and you were just 10?"

A picture immediately popped into her mind's eye. Caitlin was now taller than her and smiling down at her. Her blonde hair was a shade darker and styled differently. Her face was different, older and more mature naturally.

Olivia felt her eyes drawn to her big sister's body though. Caitlin was wearing a tight tank top that showed off her impressive chest; a chest that was frankly better than her own.

She was gorgeous with a perfect body. A flat stomach, nice shapely hips, a pert round ass and mile long tan legs.

But seeing this, she also knew exactly what she now looked like. Her brown hair was poker straight and long, her face was immature and childish, her brown eyes big and doe like, her body was very childish, her curves non-existent. She saw them clearly.

This teenaged Caitlin spun her car keys around her index finger using the ring "See?! Aren't you much happier like this?" She asked in a deeper voice but one that Olivia knew intimately.

Before she could answer, her eyes fluttered and opened.

There, sitting before her was her little sister with a goofy smile on her face while spinning a set of car keys around her index finger.

"Hey, what are you doing with my keys?" Olivia asked even as she rearranged herself on the couch, pulling her legs up and sitting cross legged just like her sister was sitting.

"I think you mean my keys. My purse was just sitting there on the coffee table"

Caitlin also had the wallet out on her lap. "Look at MY driver's license" she held up the plastic card. "Yes…everything checks out. Caitlin Elizabeth Sanders. Birthday March 7th, 2005…hair blonde, eyes blue. Ooooo height! 5'10"! Looks like my little sister will never be bigger than me. Or older than me ever again" she teased the 5'7" Olivia.

Olivia was blushing now. She caught herself just before crying out "quit it" again.

"Just say the word and poof! I'm going to work instead of you and you're going swimming instead of me" Caitlin said, scooting forward, closer to her sister.

"This is stupid" Olivia said but in a shaky voice. Something was off somehow and her stomach was flipping and fluttering like wild. Her hands were numb and the strangest tickle sat in her throat.

The hairs on the back of her neck stood up as a thought popped into her mind. "If I say it right now. It will positively happen. The whole world will flip and we will essentially switch places. No one but us will ever know or realize it. To everyone else, it will be like we've always been that way"

Caitlin had scooted all the way up so their knees touched. She wiggled her way in so that their toes touched off each other's.

Olivia felt her sister up so close to her. Caitlin put her hands out and Olivia simply took them.

They looked into each other's eyes.

Saliva flooded into Olivia's mouth. She swallowed; her lips parted and her mouth quivered as her mind spun. She had to say it now. Like a compulsive dream playing out, like an itch that had to be scratched, the curiosity was killing her. "This is impossible!" The rational part of her brain screamed. "Think about what you're doing! You'd actually be Caitlin's little sister. You're going back to the 4th grade!"

"But I have to see if it's real and it works! I have to…I have to switch places with her!" The other part of her brain yelled.

Hesitantly, Olivia found her voice "Wha, what if you…were my big sister and I was your little sister? What if our places were reversed? I wish I could switch places with you" Olivia said.

A smile spread across Caitlin's childish face. She squeezed her sister's hands tightly "I wish our ages were reversed. I wish I was your big sister and you were my little sister" Caitlin echoed.

Upon saying and hearing those words. An electricity ran through the sister's. The strangest tingling sensation. They could taste it in their mouths. Tickling in their throats. A sensation that ran down through their spines, to every single nerve ending.

Caitlin's tiny hands held onto her big sister's. Her fingers came nowhere near able to wrap around Olivia's larger hands but Olivia had placidly placed her hands out giving her little sister the chance to clasp her hands around them.

Olivia felt her hands giving way. She felt more pressure building up as Caitlin's grip tightened. Caitlin's fingers looked like they were getting a firmer hold. Her thumb and fingers were barely visible on the backs of her hands. But now that Olivia looked again,  her sister's fingers were wrapped fully around, almost touching across the backs.

Caitlin felt her sister's hands seemingly giving way under her grip. Her hands were barely able to grip her sister's palms, her fingertips barely came up over the sides with her first squeeze. Now, she felt her thumbs touch the tip of her middle fingers.

They sat close together, linked and touching on the couch. Their eyes were locked in the other's. Olivia took in a deep breath and held it. She felt every muscle in her body twitch and come to life. Her eyes popped wide open.

Olivia started to shrink.

She swallowed, afraid to move, yet she was moving. She wasn't moving herself, her body was moving all on its own. Her jaw went up and down, paralysis hit her voice betraying her. It was when she saw and felt movement in her sister that it finally broke.

"AAAAAHHHH!" Olivia screamed.

Caitlin was looking into her big sister's face. Her lips were pursed tight and she was barely breathing. She felt every muscle in her body suddenly twitch. Heat and sweat broke out over her face. She was moving.

"But I'm not doing anything!" She thought. She felt her flat ass press down harder against the cushion. Her knees pressed forward against her sister's and then, she felt her spine pop.

"I'm rising up. I feel like I'm lifting up…"

Caitlin jumped at her sister's scream "Ah!" She yelled in response "Liv!" She added in a rushed and excited voice. Her eyes darted up and down. Her eyes were playing tricks on her and her head was trying desperately to catch up. "It looks like she's…she's dropping down! Is she…?! "Liv! You're shrinking!" She screamed, squeezing her sister's hands even tighter.

Caitlin put it together. The rising feeling inside her combining with seeing her sister visibly getting smaller right in front of her. "Ohmygod we're switching places!" She squealed.

Olivia felt her nose itch and twitch. Her hair tickled her shoulders. Her tank top strap slipped off her shoulder. Her eyes couldn't get any bigger as her jaw hung open in shock.

She watched in absolute awe as her little sister seemingly grew bigger and taller by the second right in front of her.

Olivia tried to push her legs out but her sister's legs were stronger and they pushed hers back. Caitlin's legs were thicker than hers; longer too.

As Caitlin took in a deep breath, Olivia saw bumps push out, pressing out the fabric of her tank top.

The bumps were growing larger, rounder without stopping, simply getting bigger and bigger on her chest, nearly spilling out of the top.

Caitlin watched that once her sister's strap slipped off, her whole chest constricted down. Her breasts simply shrank down smaller and smaller until there was simply nothing left. Just a plain flat chest, heaving with ragged breaths.

Their legs and feet were more obscured and out of their vision. Simply out of their peripheral vision did they see Caitlin thin little legs plump with size, muscles and fat giving her full, curvy thighs as Olivia's legs shrank down and away to spindly, straight, skinny little legs.

They had pressed their toes and feet together underneath their legs but as their legs moved, so did their feet.

Olivia's toes shrank down, she felt her nails tapping against Caitlin's as they grew larger.

Cait pressed her toes and feet forward, rubbing them against her sister's feet. She could plainly feel how much bigger hers were compared to Olivia's. Using the dexterity in her toes, she managed to wrap her toes over her sister's tiny little toes.

Cait curled her toes and was able to trap her little sister's toes. Olivia wiggled her toes trying to free them but Cait held them tight.

Caitlin had continued lifting up taller. She was a head taller even as they remained seated.  She was quite obviously the bigger of the two of them. Olivia had dwindled down as Caitlin rose up, not only reversing their heights but adding to their difference: Caitlin was taller than Olivia had ever been and Olivia was shorter than Caitlin had been.

They focused on the other's face. Their features were changing.

Olivia's face lost any and all.signs of maturity. Her eyes widened as her cheeks puffed up. Her nose and mouth both shrank down smaller as her teenage look faded into that of a kid barely into double digits.

Her chin and jaw softened as her hair thinned.

Caitlin's face was rapidly maturing, her features gaining a sharpness and definition. She passed from childhood to nearly being an adult in her looks. Her eyes pulled further out, taking on an entirely different, more confident look in them as her eyebrows thickened. Her mouth and nose grew larger, her lips filling out as her teeth grew larger atop a shifting jaw and chin. Her hair thickened and restyled itself.

Their hands jerked apart; Caitlin released her sister and both sisters jerked, jumping back away from the other to their respective ends of the couch. Arms and legs flailing about, hair falling into faces.

The electricity in them shooting out, dissipating into the air above them. Both took gasping breaths as the room grew perfectly still.

Caitlin's long legs spread out in front of her. Her clothes were tight over her hips, ass and chest. Her chest was rising up like never before, her whole body felt so strange and different and weird but she focused ahead of her.

Ahead of her where a small girl sat flipping long straight brown hair out of her face. It was a familiar face yet absolutely out of place.

The small girl's skinny legs sat at awkward angles, tiny pale feet turned inward, toes digging into the crack between cushions. The little girl froze.

Olivia was completely baffled. Her mind was disoriented and muddled "What just happened?!" She thought as she struggled to simply balance herself. She felt her back hit the arm of the couch but something was very off.

Her legs flew around easily, feeling very light. Her hair had flown into her face and she struggled to get it pushed back off her face.

The room swam around her as she shook her head back. Finally focusing in, her mind screamed "Everything is wrong!"

Olivia looked to the other end of the couch. A teenage girl sat there. Dark blonde hair, blue eyes, she looked poured into her clothes "I know her. She looks so familiar, she's…!"

Olivia's jaw dropped as it hit her. "AAAAAAAAAHHHHH!" She let go of a blood curdling little girl scream.

The scream got Cait moving. She lurched forward, twisting herself as she leapt at her sister. She was on top of her in a second, putting a big hand over her tiny mouth although no one would hear. Their parents were at work and so were the neighbors. "LIV!" Caitlin said loudly as she took away her gand from her mouth and held onto her sister's skinny little upper arms.

"No, no, no, no,no….this isn't! It worked! It actually worked!"

Caitlin nodded, a look of shock and yet satisfaction touched her face.

"Hoooooly…Holy Shit Hahahaha" Cait chuckled "You’re damn right it worked…we just switched places! I'm your big sister! Not the other way around! You wished for it. I wished for it. We both wanted it. It worked. Oh my God it actually happened"

"No…I don't want it now. Wish us back! You can't be my big sister! I'm 17! Not, not you" Olivia protested.

"It doesn't look like it anymore…looks like I'm the 17 year old and you're the 10 year old and I think the journey was one way…sorry shrimp, looks like this is us from now on" Caitlin said.

The wallet she was playing around with was lying nearby and she picked it up. A smile spread on her face as she looked at the driver's license.

Anxiety was building in Olivia until Caitlin flipped the plastic card around and put it in her face. Her stomach dropped.

The face and name were Caitlin's. The height and birthday were also what Caitlin had teased her with earlier.

"Looks like I'm the driver around here. That must mean your birthday is January 16th 2012" Caitlin added as she stood up.

The room looked so small and foreign to her, completely different. A heaving breath as she reorientated herself "Wow" she chuckled with a shrug.

Olivia remained on the couch, but as Cait began exploring, she reluctantly got up.

Caitlin was walking awkwardly, picking her shorts and underwear out of her ass. "Come on, help me out here…switch clothes with me" she was peeling her little kids' clothing off her mature body.

Olivia was swimming in her clothes, she fussed and sighed but basically slipped out of them in no time.

They redressed in each other's better fitting clothes "That’s better" Caitlin said, noticing the pictures on the wall. Their school pictures. "Haha…they switched too" she said looking at them.

"What?" Olivia shuffled over next to her big sister, barely coming up to her boobs. She saw the pictures. The one on the left showed a little girl with brown hair and eyes. Personalized in the corner with Olivia, 3rd grade 2021-2022

The one on the right showed a blonde haired blue-eyed teenage girl. "Class of 23 baby" Caitlin said.

Cait looked at the clock "Oh…I guess I need to get ready for work. My shift starts in a half hour. Audrey's Mom will be here to pick you up anytime now"

"But…but…" Olivia started to protest but she wasn't finches words for it, or the passion for it. She thought back to when she had been sitting on the couch. The overpowering thoughts. She could see them so clearly. Her, still bigger and older than Caitlin. Her little sister, so eager, teasing her, goading her into saying that she wished that they would switch places. But, she had wished for it. She had envisioned exactly this…she had seen the older version of Caitlin so clearly.

"What will it hurt to stay like this? At least for just today. Let her go to work. I actually have the chance to play like a little kid again" Liv thought, a devilish smile on her face.

She rushed to her room. The smaller room. The door to the bigger bedroom was closed and she could hear her sister changing clothes behind it.

A bit of a shock as Olivia saw herself in the mirror "Ohmygosh!" She jumped. Then she actually examined her reflection and herself. Olivia could only laugh, giggling as she put on her swimsuit and covered back up. She grabbed 2 towels and put her tiny feet into a nearby pair of flip flops.

Stepping out into the hall, the door to her big sister's room swung open. Caitlin was in her black pants, green collared logo shirt, her hair pulled up and back with her Subway hat on. "Looking good sis haha" Liv teased

Cait scanned her little sister up and down.

"I'll take it…it's worth it to me" Cait replied. "My clothes fit…they're not your old clothes because I'm bigger than you were"

"Well that makes sense I guess" Liv closed her eyes as another flashback hit her "it will be like it has always been like this. No one will ever know or realize it besides the two of you"

"Even my name tag says 'Caitlin'" Cait pointed out.

"Well duh" Olivia replied sarcastically. It hit her then just how much bigger Cait was compared to her. There was a woman and a kid standing there. And she was the kid.

"Well, have fun shrimp. After Work I'm going out with my friends for dinner and a movie then we're just going to hang out"

"Sounds boring" Olivia shot back

Caitlin just shrugged.

Their eyes locked. In a split second, Olivia saw them like they had been. She was tall and had her body. Caitlin was little and young again but only for a brief second.

Both of them sucked in a breath. Caitlin was looking up, Olivia, looking down. Caitlin just saw the ceiling and Olivia was looking at the ground and her sister's feet.

They both shivered. Caitlin looked down and Olivia looked up until their eyes met.

Olivia felt that compulsive thought rear up, stronger than ever "What if we stay just like this? What if we never switch back?"

Caitlin was feeling it too. Intrusive thoughts "What if I'm now her big sister? What if I'm the one 7 years older?"

"I wish we could stay like this" they said simultaneously.

"I wish I was your big sister and you were my little sister" Caitlin said as Olivia said "I wish you were my big sister and I was your little sister"

"Forever" they finished together.

They held still and that energy in the air swooped through them but just as fast as it came, it disappeared and they both jumped. They found themselves still there in the hallway. Caitlin smiled as she did a quick inventory that she was taller, older and still had her killer body.

Olivia too did her quick double check. Short, light, and little "Yep. Just how I want us to be"