Rainbow and Rarity had their fun on the pitch, then headed back to RD's apartment. To their surprise they found Fluttershy waiting on the doorstep.
"She looks to be in a daze." said Rarity while they were still out of earshot. "How can she sit there in this heat?"
Both the girls notice the shimmering sweat on Fluttershy's plump thighs and generous cleavage.
"She could kill someone with the way she looks right now." said Rarity.
"Fluttershy is the most cluelessly-sexy person I have ever met." Dash said. "She has no idea the effect she has on others."
Fluttershy was wearing a white tank-top of a size she had outgrown some time ago. Her pants looked like jean shorts, but were so small as to be hardly visible when she was sitting down, leaving her long legs entirely exposed, along with most of her asscheeks. She also wore a pair of white sneakers, which drew more attention to her bare legs and somehow made her next-to-nakedness all the more obvious.
"Maybe she's secretly a tramp." said Rarity. "I mean, exposing so much of herself in public..."
"Then what does that make you?" teased Dash, referring to how she was denuded on the soccer pitch not an hour before.
"That wasn't my decision!" Rarity replied, her voice breaking into a laugh during the last word, unable to keep from giggling along with Dash.
The two of them clammed up when they got close, not wanting to make Fluttershy nervous.
"Hey, Fluttershy. What's up?" Rainbow asked, stepping up to the creamy girl who was lost in thought.
"Oh, hey Rainbow!" Fluttershy said, looking up at Dash, who was now blocking the sun. "And, Miss Rarity too! I didn't even see you guys approaching."
Rarity gave a polite wave and smiled.
Dash spoke next. "I don't remember having anything planned today. Is everything alright?"
"Oh, it's nothing. I mean, it's not nothing." It was plain to see that Fluttershy was nervous, more so than usual. "I just... I need someone to talk to, and I was hoping..." Fluttershy trailed off, but Dash understood.
"Hey, don't sweat it. Stand up and I'll let us all in." said RD.
Dash unlocked the door and the three of them headed inside.
"Everything is so bland." Rarity critiqued. "For a girl with rainbow hair you'd think your apartment would have a little more color."
Dash ignored her and settled on the couch with Fluttershy.
"How can you leave your clothes strewn about like this?" Rarity asked, picking up a bra which was draped across the back of a chair.
Dash knew she wasn't really looking for input and decided to give Fluttershy her attention instead.
In the meanwhile, Rarity took it upon herself to start tidying, apparently content to leave the talking to Dash.
"Well, it looks like it'll be just you and me for a while. What was it that you wanted to talk about?" asked Dash.
"It's a little embarrassing." Fluttershy said, hiding one of her eyes behind her hair. "Angel and I were watching a movie the other night, and it was a little romantic."
Her voice was almost a whisper, and she grabbed a nearby throw pillow and hugged it tightly for support before carrying on.
"When the couple kissed it made my heart flutter, and when they got a little more... passionate, I started to get really hot, and felt the urge to press my legs together, or cross them or something. I don't know. I thought maybe I needed to use the restroom, but when I got up my... I found a wet spot in my..."
She was squeezing the pillow tight enough to choke a bear, and barely managed to squeak out the word "Underwear."
"I thought it might have been... I thought maybe I... Anyway, it was too sticky and..."
Fluttershy hid her blushing face behind her hair completely, unable to utter anything more than a soft, high-pitched whine.
Dash tried her very best keep from snickering. The last thing she wanted was to make her oldest and dearest friend feel bad.
"Fluttershy, you're adorable." said Dash.
"Quite right." Rarity, who had been eavesdropping, chimed in briefly before returning to her meddling. "With the way you dress I had thought you somewhat of a... Well, I realize now that you simply didn't know any better."
Fluttershy might have been offended, if she had any idea what Rarity was talking about.
Dash, on the other hand, was beginning to tire of Rarity's conceited contributions.
"Here, let me show you something." Rainbow said to Fluttershy, giving her a mischievous wink.
Dash stood and snatched Rarity away from her unrequested meddling and presented her before Fluttershy.
"What are you—Oh... No, wait! Not in front of Flutter..."
While Flutters looked on in bewilderment Dash tugged down Rarity's pants and began rubbing her clit through her panties.
"Look closer, Fluttershy." Dash said. "Do you see?"
Fluttershy was hesitant, but did as she was told and saw what Dash was trying to show her: a wet spot on Rarity's panties, just like the one she had found on her own.
Rarity wanted to faint from embarrassment.
"Are you sure Rarity is okay?" asked Fluttershy, unnerved by the way she reacted to Dash's touch.
"Sure. She makes a big fuss at first, but she knows she'll get a treat if she's a good girl." said Dash, jamming her fingers into Rarity's pussy and pinching her nipple between her nails, making Rarity's eyes roll back in her head while the wet spot on her panties grew larger.
When Dash let go, Rarity fell to her knees in a dramatic display, breathing heavily.
"Rarity! Are you okay?" asked Fluttershy, stooping low and grabbing Rarity's shoulders, her massive tits hanging like an apron.
"I'm alright, darling." Rarity said.
"What happened to you?" Fluttershy asked, curious now that she knew her friend was unharmed.
"If you want, we can show you." Rarity said. “I could use some help repaying Rainbow.”
Author's Note
Hopefully I was able to include Fluttershy in a way that made a certain degree of sense for her character. So much of this was taken up by dialogue that I am considering adding a second part. We’ll see, though. 
