Flitter Outgrows Her Sister

by SizeShifter

Chapter 1

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Flitter puffed as she jogged around the track. She wasn’t keeping close attention on how fast she was going as she was more concerned with general endurance and keeping her blood pumping. Not that any of it really mattered. What was more important was that she was outside where her sister wouldn’t see her. She was too busy with the inside area of the gym where she would be lifting weights rather than chiding her for only doing four laps so far in the time she’d been out here.

Then she heard the pounding of shoes to her side soon followed by Cloudchaser’s face looking down at her. “Hey, you! What are you still doing out here? You told me you’d work out with me today.”

“Only because you practically dragged me here. And I am working out. I’m on my seventh lap.”

“Ooh, only seven?” Cloudchaser grimaced, “I’ve really gotta get you out here more.”

She then leaned over and wrapped her arms around Flitter’s narrow waist as she kept pace with her. Cloudchaser had always been the bigger of the two growing up considering that she was born nine months ahead of her sister though even now as adults the gap never closed so she had no difficulty leaning in to Flitter’s 5’2 body compared to her standing at 5’10. Pressing against her back Flitter could feel Cloudchaser’s breasts against her which were also at a size that she could not compete with.

“C’mooon,” she begged, “you said you’d work out so that’s what you’re gonna do. I need someone to spot me anyway.”

Flitter wanted to just keep up her jog and ignore her sister, but Cloudchaser gradually steered her towards the doors back into the gym. Cloudchaser wasn’t exactly beefy, but she had ample lean muscle which was too much for Flitter to fight back against while her protests were being ignored. Begrudgingly, she stopped resisting.

“Fine. But at least find a spot where I can look at some of the boys working out.”

“Why do you need that when there’s plenty of me to enjoy? Isn’t that the fun of spotting your big sis?”

Flitter lightly elbowed her in the stomach to which Cloudchaser just giggled, but she did release her. “Don’t know why you’re in such a bad mood. I thought this would be fun for us!”

“Yeah, but I don’t need you being weird like this.”

“Whaaat? Who’s being weird? I know you like girls too so I thought you’d be happy with a view as good as I provide? Or are you past the phase of asking me for ‘kissing practice’?”

Flitter flushed, “I’m not a weird little teen anymore!”

“Really? You still look it.” Flitter went to swat at Cloudchaser but she nimbly jumped back out of the way then ran ahead. “Race you to the weight racks!”

Flitter normally wouldn’t want to humour her like this, but ran after her anyway. Sure, she may have had thoughts about her sister and they may have done things together some time ago, but it was different now. She was beyond that. At least, that’s what she told herself as her eyes kept locked with Cloudchaser’s firm butt as she ran ahead.

Cloudchaser stopped at a weight bench and waited for Flitter to catch up. “Wow, all that cardio really hasn’t done much for ya, huh?” She crouched down. “I guess we’ll do the leg press after for those noodley things, huh?”

Flitter ignored her poking at her soft legs. “Just rack some darn weights.”

“Sure, mind helping me with the other side while I do this? Just put that 50 pound weight on there. Don’t grab two 25s or it’ll be unbalanced.”

Flitter knew full well what her sister was trying to do here. This was the same sort of thing that tended to happen every time she dragged her to something like this. Even back in school for sports days they’d team up, but she knew Cloudchaser enjoyed being the one to win the events for them and have someone inferior to compare herself to.

Flitter wasn’t going to tell her to do it though. If she wanted the weight on there she’d get it up there. Her frustration would be the fuel to push her to lift it. It had to!

She grabbed the weight at its sides and lifted. And lifted. And strained. And thought she felt something pop in her back.

Cloudchaser snickered as she leaned over and took it from her. “Flitter, honey, your form is absolutely brutal. Putting all the weight on your spine like that is gonna kill ya. I’ll get it this time.”

With a metal clunk the weight was put on the bar and Cloudchaser got into position lying down under it. Flitter was familiar with this part at least and stepped over by her sister’s head with her hands under the bar to catch it if it slipped. Not that she thought she could do much if anything happened.

Cloudchaser unhooked the bar and began to slowly pump it up and down. Flitter gazed around the gym since her sister was now too focused to tease her any more. She looked at the other people pumping weights and quite enjoyed the sight, but her eyes kept falling back on Cloudchaser. She took in the rise and fall of her healthy bustline, the way her face looked so pretty even when tensed up, the sweat that began to trickle down her bicep-

There was a clang as the bar was racked again.

“Phew, okay, show’s over. Your turn.”

Flitter shook her head. She must have been staring longer than she thought. Then she realized what was just asked of her. “W-what? Me? I can’t lift all that.”

“I know you can’t,” she stated, “that’s why we’ll take off those big ol’ weights for you. We’ll start you with the bar and see if you can manage that.”

Cloudchaser unracked the weights and Flitter laid down on the bench. “So how much am I supposed to do?”

“Just do one set of ten reps for now. Pump it a mere ten times and then you can take a break. If you can manage that.”

Flitter gritted her teeth and lifted the bar. After lowering it just once her arms were already starting to burn, but she managed to push it up again, then down, then-

“C’mon, you’ve gotta lower it to your chest. I know it’s lower than mine, but you’ve gotta do it.”

Flitter tried to shoot a glare at her sister, but her bust was the way. Her eyes lingered for a second before focusing back on her task. She forced herself to lower and raise the bar, puffing as she counted each repetition, but when she raised it for seven she had to rack it and let her arms fall limp. She sat up with a tired, exasperated sigh.

“That’s all? You didn’t even finish the set.”

“I’m just not built like you, okay?” Flitter snapped back.

“Yeah, you’re definitely kinda tiny but I thought you could do at least that,” Cloudchaser said with a poorly stifled laugh, “Guess I can’t count on you to help me out with my training for the final physical test then.”

“What?”

“Oh, I must have totally forgot to mention! I passed all the Wonderbolts tests! There’s one more big test a month from now to determine if you get in. Darn, I was counting on you and your little noodle arms to help me out.”

Flitter stood up and sputtered indignantly. “You didn’t tell me you were doing those! If I’d known I’d have trained with you. We could have done them together!”

“Pfft, uh huh,” said Cloudchaser as she went to put the weights back on for herself.

“What’s ‘uh huh’!?”

“I mean c’mon, Flitter. I know you’re mad that you got beaten by a bar, but be real. You’d have washed out in the preliminaries. There were skilled athletes who failed even then. Like, can you even name a single sports award you’ve won?”

Flitter opened her mouth but paused. She had won plenty of awards! That is, awards that had also been won jointly with her sister. Any sporting competition in her life in school, in town, at events, any time she’d meaningfully placed it had been when her sister was there to drag her along.

She had enough. Flitter turned and stormed off.

“Really, Flitter? You don’t have to be mad about it! We can do freeweights! ...Whatever.” Cloudchaser sighed. That was the difference between them. When Flitter failed or got mad she’d just give up. Not her though. Maybe things would change if her sister could just learn to instead find a way to face and overcome her challenges. The best revenge wasn’t to get mad. It was to get even.

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