With a hail of sparks Cadet Scootaloo came to a stop in front of Rainbow Dash and Soarin, stomping on her board as she dismounted and catching it under her wing when it sprang up.
Soarin looked over at the gauntlet sprawled out on the runway behind her and felt a bead of sweat trickle down his forehead. With her below-average flying ability, the kid had to rely on her skills with her board to make it through that nightmare.
“What d’ya think? Scootaloo asked, breathing heavily. She glanced over at Soarin and for a moment he was at a loss for words.
Luckily, Dash answered for the both of them, hooking her foreleg around the young cadet and tussling her mane.
“That was awesome!” she said, and Soarin found himself smiling and nodding in agreement, touched by their sisterly embrace. She and Dash were so close it was hard to believe they weren’t actually related.
RD had proposed the idea for the Wonderbolts Auxiliary to Spitfire, but needed to prove that it could work. Soarin figured she must have had Scootaloo in mind all along.
Scoot had been a cadet for less than a month and had already conceived and mastered her own act to represent the Auxiliary branch in the next show. What she lacked in wing-power she made up for by working harder than anypony else, and it paid off.
“Welcome to the Wonderbolts, kid.” said Soarin, raising his hoof for her to bump once she untangled herself from Rainbow.
“Thank you, uh, sir. It’s a huuuge honor!”
“Aw, no need to be so formal, Squirt.” said Dash, grinning. “Though, I think it might be earning you some points with the First Lieutenant.”
Soarin blushed and looked away, frustrated that she could still tease him like that. “Just Soarin is fine.” he said quietly.
Scootaloo smiled and nodded. She had heard a lot about the First Lieutenant of the Wonderbolts, but she hadn’t expected him to be so... cute.
“Well, if that’s all you need from me, I could really use a shower.” said Scoot after a moment.
“You’re dismissed.” said Dash, giving her an extravagant salute. “Actually, I might join you, if that’s cool.”
“Sure,” replied Scoot. “I don’t mind.” She stole a brief glance over her shoulder at Soarin, sheepishly feigning distraction.
“You should come too, Soarin.” said Dash suddenly, hoping to catch him off guard.
“You know, to check out the barracks.” added Scootaloo quickly, giving Dash a look that said ‘knock it off.’
Dash laughed. “Yeah, that’s what I meant.” she said, leading the way to the new barracks.
“S-so, the showers are just... open?” said Scootaloo, apprehensive.
“Yep.” said Dash, walking up to a shower head and switching on the water. She sighed as it pounded against back and shoulders, instantly drenching her from mane to tail.
“You’ll get used to it. Besides, your team is like your family.” she added, shouting over the noise of the water.
Scootaloo blushed, turning her gaze to Soarin only to nervously turn away again after seeing him erect.
Though overwhelmed and a little annoyed with Dash, the water did look nice. Cautiously, she approached the shower next to Rainbow and turned on the water, immediately satisfied with her decision.
However, while Scootaloo was preoccupied Rainbow Dash took the opportunity to ambush her, putting her foreleg over her flank and pulling her tail back with her teeth. She began massaging her ass with her hooves, squishing her flanks together and pulling them apart, showing Soarin the young pony’s anus and pussy.
Taken completely by surprise, Scootaloo looked over her shoulder at Soarin and was too embarrassed to move. More than that, though, seeing Soarin’s gaze locked firmly on her behind actually made her feel... good. It was empowering, knowing she could get that sort of a reaction out of somepony with her body.
Abruptly, Soarin accepted Dash’s invitation and stepped up behind the rookie while Rainbow stepped back into her own stream to watch.
Scootaloo felt him press against her flanks, sliding the tip of his cock into place at her entrance.
He braced himself on her slender frame, then plunged his cock into her petit opening, threading it as far as it would reach.
Scootaloo gasped, wincing with every successive thrust, each faster and harder than the last.
She moaned each time he pumped her pussy, his engorged testicles slapping against her wet ass.
Dash watched while Scootaloo was driven into the wall by Soarin’s impressive cock, and soon she was no longer content to merely observe. She signaled Soarin to stop and with great effort he obeyed.
He stepped back, dragging the mare attached to his cock along too, her pussy squeezing it so tight he felt like he might never get it back.
Scootaloo watched from the floor as Dash sat against the wall in front of her, legs spread.
“Ok, Scoot, lift your head up, and keep your mouth open.”
Scootaloo did as she was told, blushing when she saw Dash’s teats.
With a signal from Dash Soarin was set to work again, this time thrusting Scootaloo into RD’s crotch, plunging the girl’s face into her surrogate sister’s teats again and again.
In between gasps she sometimes managed to close her mouth around one or the other of Dash’s nipples, releasing them with a pop of escaping suction when she was pulled away. Other times she licked between them from bottom to top, catching a brief yet satisfying glimpse of Rainbow’s expression.
The three of them made their fair share of noise, partially masked by the hiss of the showers, and once Scootaloo figured out that she could spear RD’s pussy with her tongue, it wasn’t long before the three of them came.
The petit pegasus filled up fast, cum leaking from the edges of her pussy. Soarin struggled to pull out, the flared tip catching momentarily at the entrance before popping like a cork, releasing loads of creamy cum between winks.
Author's Note
I spent a fair amount of time procrastinating, bouncing from one bit of writing to the next, until finally having something here that I could work with. Trimming it down was a pain, and I am not entirely satisfied, but I wanted to include at least a little bit of background to explain how things got to where they are, in keeping with what I had attempted to establish regarding Spitfire— who is absent from this piece— and the future of the Wonderbolts she envisioned.
Hopefully somepony out there likes it. 
Thanks again to user ‘superfun’ for the request and initial concept.
