Scootaloo Springs Up

By next week Scootaloo had shot up another two inches, bringing her to five-foot-eleven. It was a staggering change for both of them. Rainbow Dash had to alter Scootaloo’s prepared meal plans after the growing teen had confessed to sneaking extra food to curb her appetite. Now that her calorie intake had been adjusted it seemed to be accentuating her growth even faster. Looking up to the once much smaller girl was still difficult for Dash to get used to. Outside on the runs, Scootaloo broke nearly every one of her personal records, and was consistently ahead of Rainbow Dash in all of them: time, speed, laps, sprints. Everything. It wasn’t like Dash was complaining though. A lot of her time was spent staring at Scootaloo's jiggling rear, which left little to the imagination based on how form-fitting the dolphin shorts she was usually wearing.

It was during their workout for the day in the gym that Dash finally got bested at her favorite test of strength.

“Okay, that’s it for today. Mealtime!” Dash finished her stretches and walked over to the door.

“Wait a sec,” said Scootaloo, lightly jogging over from the lifting area, where she was racking her fifty-pound dumbbells. “We still need to arm wrestle!”

Dash froze, gulped, and turned around to Scootaloo. Her heaving chest pushed out the front of her shirt an extreme amount, three deep stress lines conveying the fabrics struggling to hold back her bountiful bosom. It was cut low, exposing the three ridges of Scootaloo’s well-defined abs, which flowed down to defined pelvic muscles before the hem of her shorts began. It was slightly intimidating. Scootaloo just oozed physical power at this point, and the small fold up chair creaked ever so slightly as she settled down at the table.

“My bad, I... wanted to sink my teeth into some food,” Dash chuckled nervously, meeting Scootaloo at the table. They clasped hands, and Dash’s eyes widened at the size of Scootaloo bicep. It was now noticeably bigger than her own, with a single blue vein running across the crest of it. It looked as big as a softball. And much harder.

“One”

“Two”

“THREE!”

They tensed, and Dash hitched her breath, her arm immediately forced hard onto her side of the table. Dash collected herself, holding back and trying to meet in the middle, but Dash could only budge a little bit in the other direction. Scootaloo redoubled her effort, pushing Dash's arm down even further. The furthest ever. The wood of the table was only a few inches away from her knuckles now. Dash growled, trying to muster the strength and energy to fight back and bring her arm up. Dash barely managed to move back in the other direction an inch, but the burst left her and she couldn’t hold out anymore. She wasn’t strong enough.

Thunk.

“I did it,” Scootaloo whispered in awe, withdrawing her hand. “I beat you in arm wrestling! I DID IT!” Scootaloo jumped up triumphantly, fist-pumping and spinning around. “I DID IT! I DID IT!”

Rainbow slumped back in her chair, panting for breath. “Yep, you finally got me Scootaloo. Fair and square,” she paused for a second, taking in the fact that just happened. “Way ahead of schedule too… am I the best trainer ever or what?”

“The best!” Scootaloo finished her little victory dance and grabbed her towel. “I didn’t think this would ever happen. Whew. Wow!”

“Wow is right. Speaking of wow, let’s just hope you quit growing sometime soon. These ceilings only go up to like, seven feet-ish down here,” Dash stood up, heading to the door.

Scootaloo laughed, “Good point, maybe I’ll stop at six feet by next week.”

By next week, Scootaloo didn’t just hit six feet, she blasted right past it to a little bit over six-foot-two. Shirts and shorts that used to fit Dash perfectly now looked glued on to Scootaloos expanding body. All her shirts would reveal Scoots hardened midsection no matter how much they were tugged down, especially since Scootaloos breasts continued to push the front of her shirt out more. Even the largest night shirts Dash owned exposed the bottom row of Scootaloos bulging abs, and her breasts had to be E cups by now. Or bigger. It was hard to tell since she continued to bind back her breasts. Dash could tell that this solution wasn’t going to last much longer. Scootaloo had to use more and more of it just to keep them from flopping out during their runs.

It wasn’t just Rainbow who was taking a keen eye. With her powerful, growing body, Scootaloo herself spent a lot of time admiring herself in the mirror. There were a lot more defined muscles on her body now. The bulging lats, her raised traps, the impressive biceps and fetching calves: Scootaloo loved everything about her body now, and that it was catching Dash's eye as well.

Rainbow tried to be subtle about looking. Usually when Scootaloo’s wide back was turned or when she was playing with her phone. Scoot caught her the first few times and thought there was something on her skin or ripped clothes. The not so subtle lip bites were all she needed to see to confirm Dash had some degree of attraction towards her. It made Scootaloos heat beat like a drum in her chest. It also motivated her to be a bit more showy.

Now whenever Dash was around, Scootaloo would drop something, then bend over to pick it up slowly and present her big, wide ass towards her mentor. Every time she drank some water out of her bottle she flexed her biceps and placed a hand on her hips, thrusting one leg slightly forwards. It was a sort of little teasing game. How much could she get away with showing off before Rainbow would snap out of her gaze with a blustery unrelated comment.

The best moments were on their daily runs. Scootaloo could now outpace Rainbow Dash at every event. Leaving her mentor in the dust was a delicious, however, Scootaloo maintained a short distance in front at all times. It wasn’t like she had to look over her shoulder to know that Dash was looking over her big, muscular body; Dash was staring so hard she could feel it.
Especially during stretches.

One day while running outside back home Dash noticed that Scootaloo was lagging behind her a little, and slowed herself to a jog.

“C’mon Scootaloo pick it up!” yelled Dash, glancing back at the six-foot-three teen running behind. Rainbow continued forwards another few yards before an odd tearing sound filled the air.

“OW!” yelled Scootaloo.

Dash turned around just in time to see Scootaloo fall forwards onto the dirt, dry red dust billowing out around her.

“SCOOT!” Dash skidded to a halt and ran back towards Scootaloo, who was just maneuvering herself to a sitting position. “SCOOT! YOU OKAY?!”

“I skinned my elbows,” said Scootaloo, bending her arm so Dash could see. Rainbows attention darted to those softball sized biceps first before flitting towards the slightly bleeding elbow. It was superficial. Nothing terrible. A thin trickle of red seeped between the small cuts.

Dash inspected her other elbow. "Nothing feel broken or hurt?”

“Nah.”

“How’d you trip?”

“My feet,” Scootaloo adjusted her legs, so she wasn’t sitting on her knees. Rainbow Dash gasped when she saw her shoe.

Scootaloo’s toes had burst right through the worn front. They were sticking out so far from the tip of the shoe that the base of the toes didn’t even start until past the shoes broken tip. The sides had been split near the top half as well. No wonder Scootaloo was lagging behind.

“How long were you stuffing yourself into these?” Dash demanded, tugging the ruined sneaker off of Scootaloo’s foot.

“A few days,” said Scootaloo, gingerly removing the other shoe.

Dash scoffed. “Why? You shoulda said something a week ago. Remember what I said about running in shoes like this?”

“I know I know I know but,” Scootaloo trailed off, looking away, "I felt like, that was the last pair of sneakers that could fit me. If they didn’t last me, I’d be out of sneakers to wear.”

“Scootaloo, c’mon,” Dash looked up at Scootaloo understandingly. “Breaking sneakers doesn’t mean the end of our training. It just means we’ve got to break our rule and go to town and get some new stuff.”

“I don’t have any money for new stuff though…”

“Don’t sweat it. I’ve got you covered. We’ll go shopping in a couple days since it’s gonna be pouring out tomorrow."

“You mean it? You’d do that for me?”
'I’ve had your back all summer so far,” grinned Dash.

“Thank you so much!”

Scootaloo grabbed Dash in a strong bear hug. Dash gasped, Scootaloo’s big breasts squishing on top of her own. The force from it drew nearly all the air from her lungs. Dash patted the teens muscular back a few times.

“Sorry! Guess I don’t know my own strength!” Scootaloo laughed, releasing Dash.

“It’s alright,” said Dash with a slight grin. Her shoulders felt a little achey. “Let’s go inside.”

Scootaloo peeled off her destroyed footwear and led the way back to the house. Dash followed close behind, her eyes roaming up and down Scootaloo’s backside. Watching that ass swaying back and forth almost made up for her old sneakers being destroyed.

“Alright, we’ll go tomorrow first thing in the morning. I’ll just make tomorrow our rest day and then Sunday we’ll just resume.”

Dash emptied her pockets onto the counter noisily.

“Sounds cool to me. Boy, wait till my friends see me!” Scootaloo exclaimed, striking a classic double biceps pose, her grapefruit-sized muscles popping out, chest straining her running shirt almost to the breaking point. There were even small tears forming at the sleeves stitching.

“Wait till EVERYONE sees you,” Dash said after a few seconds of staring at Scootaloo. “I guess we’ll have to get a ride into town since I’ve got nothing that fits your feet anymore. So, tonight, have your meal and then just finish reading your books if ya can.”

When Scootaloo nodded in agreement Dash grabbed her cell and headphones, heading downstairs while Scootaloo dove into the fridge.

“Cripes, what is she doing to me?” Dash muttered, finishing her curl. “I can’t even concentrate when she’s NOT here.”

Dash had been doing her typical exercise regime for half an hour, covering her arms, back, and core. This time she was attempting ten pounds over her limit. Sweat was rolling off her face and arms. Her colorful ponytail was damp where it touched the skin of her back. It wasn’t extremely difficult. At least not physically. Mentally, though, Dash was cycling through images of Scootaloo from their run all day. It was at the forefront of her thoughts and she couldn’t shake the teen out of her head. Dash kept forgetting what set she was doing for her exercise. The music playlist hadn’t helped drown out her thoughts either.

Something caught Dash's eye and she turned around to see Scootaloo a bench behind, back turned to her.

“What the-“ Dash pulled out her earbuds. “Scootaloo?! Whatcha doin’ down here?”

“Lifting,” grunted Scootaloo in response, looking over her shoulder. “I finished the last, ngh, chapter of my book.”

“I know what you’re doing, but why?”

“Got bored upstairs waiting,” Scootaloo exhaled, lowering her arm for a few seconds before doing her next set.

Dash furrowed her brow. “You can’t just come down here and workout without any shoes.

“Why not?” Scootaloo lifted her legs and rotated herself to face Dash, looking down on her quizzically. “Don’t you want me to stick with the program? You said tomorrow’s the rest day, and I didn’t lift for today yet.”

Dash gulped, looking over Scootaloo where she was seated. Couldn’t tell for sure, but she could swear that Scootaloo was bigger than she was an hour ago. In the girl’s hand was a sixty pound dumbbell.

“It’s just, yeah, I would like to watch- I mean let you to lift for t-today,” Dash coughed, clearing her voice. “But, you aren’t equipped for it! You don’t have any shoes on! Right now Scoot, you’re running the risk of hurting yourself.”

Scootaloo leaned back for a few seconds, raising her beefy arm up to scratch the back of her head, thinking over the statement. Dash just ogled in silence at the size of those muscles -they looked almost as big as a honeydew melon. They had to be eighteen inches around or more!

“I think I’ll just keep going,” Scootaloo finally said, resuming her curls. “Even if I was wearing shoes, if I dropped this sixty pounds on it, then it would probably break my foot anyway. So there’s really no difference. Right?”

“I…” Dash paused, thinking that over. “I guess so?”

“AH! There,” Scootaloo finished her curls and grabbed another sixty pound dumbbell, and stood up. “Time for flys. So yea, I should be good.”

“Right… well, I’m… done for the day,” Dash stood up to rack her weights and inhaled sharply. Her eyes were level with Scootaloo's shoulders now! Dash glanced down to Scootaloo's feet, realizing that since she still had sneakers on, she was just slightly shorter than that right now. Her sneaker looked much smaller comparatively too. There was no way she’d grown that much in such a short amount of time, yet, there was no other explanation. Rainbow headed for the door, her head swimming.

“Sure you don’t wanna stay?” Scootaloo called just as Dash reached the doorway.

“Y’know, in case I do anything wrong or you feel like teaching me something,” Scootaloo added when Dash didn’t immediately respond.

“Uh,” Rainbow gulped, she had been staring again. “Your form is good. And you've had no problems since we first started. I dunno about that. I still need to have my meal and-“

“I’d really appreciate it!” Scootaloo racked her dumbbells and walked over to Dash. Even one step up on the stairs, Scoot was looking down at her. “I don’t want to use the barbell without a spotter.”

There was a time when Scoot would have to jump up and down and pepper Dash with pleases to get her to go along with something. Now all she had to do was get in her face and thrust out her chest a little. The fabric of her shirt creaked a little more, stitches silently breaking in protest. It was stretched across her chest so very tightly. The outlines of her big, thick nipples stuck out more than inch through her shirt.

“Okay,” Dash stepped off the staircase, back down to shoulder level with Scootaloo. “Whatcha gonna press, Scoot?”

Scootaloo shot her a sly look and waltzed over to the rack. Those massive cheeks were almost hypnotic to watch, and Dash couldn’t peel herself away. The old pair of shorts she’d given Scootaloo were strained to capacity around that big, sexy ass. They looked ready to snap off her rear. Since Scootaloo wasn’t wearing shoes those long, muscular legs were accentuated even further. Dash shook her head hard, ponytail slapping around her neck.

She couldn’t stop staring.

“Tonight I’m gonna press, ngh,” Scootaloo hefted two of the biggest plates and slid them on the bar, followed by another pair, then another, then another smaller pair, “all of it.”

“That’s impossible!” exclaimed Dash, eyeing the bar that Scootaloo was sliding herself under.

“I know, I can only fit the heaviest weights on here,” bemoaned Scootaloo, gripping the handle. “This bar isn’t long enough to load everything you have.”

That was 450lbs. More counting the weight of the bar. Scootaloo beckoned Dash over to the other side to help spot. It wasn’t that she was scared of dropping it for fear of the great weight, no, this felt like a cakewalk. The bandages holding back Scootaloo’s increasing bust were steadily falling to pieces. Little by little over the day.

And Scootaloo wanted Dash to see them burst off her body.

Dash stood over Scoot, lowering her palms and facing them up. Scootaloo gripped the bar and lifted, bringing it down, and back up again smoothly. Dash counted for her.

“Two, three, four, five,”

Four hundred fifty plus pounds went up and down like it was nothing.

“six seven eight nine,”

The muscles in Scootaloo’s arms bulged with the workout. They looked so big. So tense. So much bigger than hers. Dash couldn’t hope to come close to lifting this. It looked like with every fresh pump they were swelling even bigger. The veins clearly defined in the harsh gym lights.

“ten, eleven, twelve,”

Scootaloo was muscling through this exercise like it was nothing. Sweating, but not struggling. The strained look on her face when she had begun was replaced with a much more relaxed look as Scootaloo got used to the weight. Her breathing was starting to get ragged and it wasn’t from the barbell.

Rrrrrriiippp!!

“Thirteee-“ Dash stopped, watching as Scootaloo’s huge tits broke free of their bandaged confines, the tape slipping off her body and onto the floor in long pieces. Those big fat breasts ballooned out, unconstrained, and pushed past the tiny workout shirt Scootaloo had on. The bottom half of her wobbling tits fell below the hem of her overfilled shirt. Those thick nipples slipped past the fabric to rest just below the hem. Scootaloo racked her barbell and sat up.

“Whew, didn’t expect that! These bandages usually hold these pretty well,” Scootaloo stood up in mock surprise, swiveling to face Dash with one hand on her hip. “I guess I’ll definitely need a bra tomorrow too, right?”

Dash was speechless. Scootaloo had literally just burst out of her bandages right in front of her, and the tiny workout shirt did nothing to hide her huge assets. Those tits looked as big as her head! They sloped perfectly on her broad chest and puffed out with no sag thanks to the strong pectoral muscles holding them up. Scootaloo fidgeted with the hem of her shirt a little, trying to pull it down past her nipples to no avail. All it did was partially obscure her half dollar sized nipple.

“Yeah,”Dash squeaked out, her voice cracking. “We’ll get one tomorrow.”

“Great! Thanks for spotting me!” Scootaloo patted Dash's shoulder roughly, the smaller woman physically sinking away from her. Was she even taller than earlier!? Should she ask to measure?

“Oh, now that we’re done, arm wrestle?”

“Sure,” Dash stumbled over to the table, clapping her hand with Scootaloo. Since the first day she lost, Dash had lost every single challenge since.

“ONE TWO THREE GO!” Scootaloo announced, almost instantly bringing Dash’s arm down to the table with a loud thunk. “WHEW! I win again! That’s two weeks in a row!” Scootaloo raised her arms in the air victoriously and revealed an unobstructed view of her huge, perfect tits.

“Two weeks,” Dash rubbed her arm. Last week she could at least put up a challenge. Now Scootaloo was putting her down as easy as she had when they first started. It was almost pointless to keep doing it. All that happened every day was Scootaloo winning with a little less effort.

Deep down, Dash knew, that she was starting to love it. Love how much more powerful Scootaloo was compared to her now. Loving the feeling of her best efforts being incomparable to this girl who had nothing a few months ago.

Dash just gazed at Scootaloo as she walked out of the gym and upstairs. The swinging hips, the backside of her big tits spread out on either side of her torso. With her gone, Dash slipped her hand under her shorts because she was just so insanely turned on from that display. Soaked. Her panties were sopping wet.

Tomorrow was going to be a hell of day.