Author's Notes:

All right, so this story is probably lower quality, but I used up a little too much of my creative energy on my other stories.

Lightning Dust was flying around in search of Rainbow Dash. She wanted to challenge her to another race and prove she was the better flyer!

Lightning Dust flew overhead and saw Rainbow Dash. With her stood Applejack, Pinkie Pie, and Rarity. Applejack was rubbing Rainbow Dash's butt, and Rainbow Dash looked like she was really enjoying it!

Suddenly, Lightning Dust wanted someone to rub her butt. No one else had ever done that, nor had she ever asked them to. So, she decided to wait until Rainbow Dash was done this, and then challenge her again.

...

Rainbow Dash had just finished washing her Equestria Games outfit when Lightning Dust flew in front of her. "I challenge you to a rematch!" she said.

"Haven't you learned your lesson?" said Rainbow Dash. "You can never beat me!"

"This time, the loser has to rub the winner's butt!"

Rainbow Dash's heart started beating faster. As much as she liked having her butt rubbed, she wanted to rub Lightning Dust's butt even more.

"You're on!" said Rainbow Dash.

They put on their exercise outfits, both including skintight white shorts, and then they raced at the same location as before. Rainbow Dash flew as hard as she could, and was slightly ahead of Lightning Dust. But she wanted to rub Lightning Dust's tush, so she flew slightly slower near the end, allowing Lightning Dust to pull ahead and win.

"Ha! I win! I am the superior flyer after all!" said Lightning Dust once they'd had a few glasses of water to drink. She turned around so that her behind was facing Rainbow Dash. "Well, we had a deal!"

"You got it!" said Rainbow Dash a little too enthusiastically. She placed her hooves on Lightning Dust's butt, which was damp and smelled of sweat. She started rubbing Lightning Dust's rear, which felt more firm than Rarity or Fluttershy, but she still loved it, and so did Lightning Dust!

Then Lightning Dust farted in Rainbow Dash's face. She giggled, hoping Rainbow Dash would be grossed out, but Rainbow Dash only laughed. Lightning Dust's heart sank. Rainbow Dash thought it was funny. Still, she was starting to like Rainbow Dash again.

Then Rainbow Dash farted loudly. "Hey, how about a farting contest?"

"You're on!" said Lightning Dust.

Rainbow Dash lifted her leg.

PPPPPPFFFFFFFFRRRRT!

Lightning Dust stuck her rear in the air.

PPPPPPPPPPFFFFFFFT!

Rainbow Dash and Lightning Dust farted for about three minutes, but in the end, Rainbow Dash won with a 16-second fart.

"That was kind of fun," said Lightning Dust.

"More fun than being reckless?" said Rainbow Dash.

"Hold that thought!" said Lightning Dust. "I have to pee!"

Rainbow Dash quickly started tickling Lightning Dust with one of her feathers. Lightning Dust laughed so hard, she wet herself. She blushed as she felt her skintight shorts get wetter and wetter. If she wasn't laughing so hard, she would have sighed in relief.

Once Lightning Dust finished peeing, Rainbow Dash stopped tickling.

"Rainbow Dash!" said Lightning Dust, her shorts soaked with urine.

"It's nothing to be ashamed of!" said Rainbow Dash. "Here!" Rainbow Dash sighed in relief as she let go and peed in her shorts, as she had to go almost as badly as Lightning Dust did. Lightning Dust couldn't believe Rainbow Dash would actually enjoy something like this. And now that she thought about it, she kind of did too, and had no reason to feel ashamed of it.

"I have a lot of fun doing this with Applejack and Pinkie Pie," said Rainbow Dash once she was done peeing. She didn't mention Rarity, as she had promised her she wouldn't. "But we should probably just keep this between the two of us."

Lightning Dust now felt bad about how her recklessness had almost gotten Rainbow's friends killed. "I'm sorry for everything back at the academy," she said. "I'll try not to be so reckless anymore. Will you ever forgive me?"

"I already have!" said Rainbow Dash.