Rainbow Dash and Rarity went down to the soccer pitch and found they had it all to themselves. There was a pleasant breeze, and the sky was a crisp blue devoid off all but a few white and wispy clouds.
Rainbow made sure they brought bottled water, which they set on the bench along with Dash's bag before she led them through a simplified variation of her usual stretching routine.
Rarity was surprisingly flexible, and kept up with Dash despite her reservations about being there. Dash had let her borrow a pair of shorts and a jersey that fit fairly well, except that Rarity's breasts were a little bigger than Dash's, which made the shirt rise just enough to show off her bellybutton.
Rarity didn't own any sports bras, but figured she would be fine with a bralette. This made it so that her breasts dangled awkwardly in her face, the jersey bunching up beneath them, when she reached for her toes. It also made running the track a literal pain, as the admittedly stylish garment struggled to hold her breasts tight enough to keep them from bouncing, slamming down after every footfall.
Either way, Rarity didn't get far before cramping up and had to walk awkwardly with a hand on her side while Dash passed her again and again, running a full mile in the time it took Rarity to finish a single lap.
Rarity was, to put it mildly, unaccustomed to the same level of physical activity as Dash, and had already begun to sweat by the time they were done warming up. Now, after attempting to run the track, her clothing clung to her skin and she had to pinch her jersey and tug at the material in an attempt to fan herself.
Dash fetched her water bottle and gave it a squeeze, spraying a thin stream of water into her mouth. Rarity attempted the same, with some success. What didn't make it in her mouth ran down her shirt and actually helped to cool her off.
They spent the next half-hour shooting goals. Dash did the shooting and Rarity played (rather miserably) the part of goaltender, spending most of the time diving away from the ball and ending up with nothing to show for it but grass stains and a bruised ego.
"Dude, you're supposed to try and block me." said Dash after the tenth time. There was a bit of laughter in her voice, though not the mocking kind.
Rarity stood up and brushed herself off. "Excuse me for trying not to get hit; and don't call me 'dude.'"
When that was done Rainbow Dash was already waiting with a pair of jump ropes from her bag by the time Rarity had lumbered over to the bench. She jammed her water bottle directly into her mouth and squeezed a bit too hard, sending a burst of liquid into the back of her throat and making her gag.
"Grab your rope and follow me." Dash said cheerfully, walking backwards and holding up her own rope.
"It feels like my body might catch fire." complained Rarity as she joined Dash on the polyurethane.
To her relief they started off slow, but as things got faster Rarity's chest began to bounce uncomfortably again, the dull pain distinct from the sharp sting in her lungs.
Dash was fast, and could do all sorts of tricks that Rarity was sure she couldn't replicate. It was all she could do to avoid tripping over herself. Eventually, and perhaps inevitably, the rope caught on her shins and wrapped around her legs, wresting the handles from her grip and making her fall onto the nearby pitch.
"Ow!" Rarity exclaimed. She wasn't injured, but she was embarrassed. What was worse is that she couldn't seem to untangle the ropes herself, and would probably have to rely on Dash's help.
RD set her own rope aside, coming over to check on her friend. She saw her frustrated expression, and the silly predicament she was in, and smiled once she was sure she wan't hurt.
"Need a hand?" asked Dash, standing over Rarity.
"I'm quite fine, thank you." Rarity lied, pulling uselessly at the ropes.
Dash recognized the opportunity to get back at her friend for the housesitting incident and decided to seize it, so she fetched her own rope and pulled Rarity's hands behind her back.
"What are you doing? This is not helping." Rarity said as Dash bound her wrists together.
Dash then lifted Rarity's jersey up over her breasts.
"Hey! What are...? Oh I see. I said I was sorry, you know." Rarity said. "Well, at least it's not more running and jumping."
"It wasn't that bad." said Dash, unhooking Rarity's bralette and setting it aside.
"Not on the pitch, please. It'll get dirty." instructed Rarity. Dash ignored her, instead pushing Rarity onto her back and straddling her.
"Why do you complain so much?" asked Dash, lifting her own jersey over her head and tossing it aside.
Before Rarity could answer Dash planted a kiss on her lips, slow and sensual. When she pulled away a line of spit bridged their mouths before snapping like a rubber band.
"What? Nothing to say?" said Dash.
Rarity thought about responding, but didn't want to ruin the moment. For the first time that day, she was enjoying herself.
Dash nuzzled Rarity's neck while nudging her clit with her knee, occasionally pressing her own pussy against the other girl's hip. It wasn't long before they both came, though Dash was insatiable.
They writhed against one another on the pitch, Dash bearing down on Rarity like a ravenous dog. She tasted every inch of the helpless girl, enjoying her moans much more than her whining.
There was some aggression in Dash's enjoyment of Rarity’s body, but she didn't mind. If her friend needed to let out her frustration, then so be it. There were far worse things than being ravished by a cute, sporty girl with rainbow hair.
Author's Note
This took longer than it should have, but I’ve been really busy the past month. 
Still, it was nice to work with superfun again. 
If you enjoyed this, you might like some of their other ideas, put into words as the stories ‘Encore,’ ‘Second Encore’ and ‘A Whole New Show.’