Rainbow Dash was playing a soccer game against the Shadowbolts. They were playing at a soccer field with a circular dirt track around it.
It was raining hard, but Rainbow Dash didn't mind. On the contrary, she actually liked the rain a bit. Her friends, who were not playing, stood to the side, each with an umbrella, right next to the track, which was now made of mud due to the rain.
Rainbow Dash was wearing her usual pink miniskirt and skintight black shorts, which were completely soaked, but that didn't stop her from playing as best she could and scoring more goals than anyone else on her team, keeping a big lead the entire game.
As Lemon Zest had the ball and made her way toward the goal, Rainbow Dash kicked the ball away, a little harder than she had intended, because the game was about to end and she wanted to score one more goal, even though she knew there was no way she could possibly lose at this point.
The ball rolled toward the track, and as Rainbow Dash ran after it as fast as she could, the rain stopped. The track looked slick with mud, but all Rainbow could think about was getting the ball before it was out of bounds.
Sunny Flare slid on the ground and kicked the ball away from Rainbow Dash. Unable to stop herself, Rainbow lost her footing and fell face first onto the muddy track.
Sunny Flare passed the ball to Indigo Zap, but at that moment, the announcer said "Time's up! Team Rainbow Dash wins!"
Rainbow Dash sat up, getting more mud all over her back half, but she didn't care. "All right!" she said, raising her fist in the air, satisfied at having won the game.
"Oooooh, looks like fun!" said Pinkie Pie, and she ran over to Rainbow Dash, jumped into the mud beside her, and started playing around. Her jean shorts were saturated with mud within seconds, but she enjoyed it. This was really fun for her.
Rainbow Dash chuckled. "Pinkie Pie, you are so random!"
Twilight, Sunset, Fluttershy, and Applejack laughed, but Rarity could only stare. Pinkie Pie was playing in the mud like it was nothing. To keep up her prim, ladylike image, Rarity pretended to hate getting dirty, but just once she'd like to try it. She made a slight motion, about to run over and join Pinkie and Rainbow, but stopped. She didn't want to admit to anyone, even her friends, that she wanted to get dirty. She had kept up her facade for too long, and it just didn't seem ladylike.
But, more than ever now she wanted to do it. And, she could think of one girl who could help. One girl who had a mud field at her home. One girl who liked her a great deal, however often they had butted heads in the past, and would understand her interest in this, for she didn't mind getting dirty any more than Rainbow Dash and Pinkie Pie.
...
An hour later, Applejack was at her home, having finished dinner, when there was a knock at the door. She opened it. In the doorway stood Rarity, wearing a light blue tank top and short purple shorts. Applejack thought she looked absolutely stunning. More fashionable than the dusty old jeans Applejack was wearing now, but jeans, jean shorts, or jean skirts were her style and Rarity had hers.
"Howdy, Rarity," said Applejack.
"Applejack... can I ask a favor of you?" said Rarity, looking and sounding a little nervous.
"Sure thing."
"But first, I want you to promise you won't tell another soul."
"I promise."
Rarity's heart was pounding. "You see... I... I know I act like I hate getting dirty, but the truth is, I've always wanted to. I know it doesn't seem very ladylike, but when I saw Rainbow Dash and Pinkie Pie in the mud earlier today, all I could think about was how badly I wanted to be in their position. But I couldn't go into the mud with them because I don't want anyone to know that I'm less ladylike..."
"Rares, no one's gonna think you're too unladylike for that," said Applejack. "There's a LOT less ladylike things than that that Rainbow and Pinkie like to do. And me as well. Most of us don't mind it too much. Pinkie Pie loves it, and ah think Fluttershy does too. And, why didn't you pretend to trip and fall in?"
Rarity relaxed a bit knowing Applejack wasn't making fun of her for it. "I didn't think I'd be able to make it look convincing."
"Well, if playin' in the mud is what you wanna do, you came to the right girl," said Applejack. "We can use the mud field in mah backyard, and then ah can give you a shower and bubblebath when you're done. You can tell anyone you meet on the way home that we had a water fight instead. Ah know you've had fun doin' water fights with us."
Rarity had initially rejected the idea of water fights, for the effect it would have on her hair, but Rainbow Dash and Applejack had talked her into it and she had found it quite fun, plus her hair had restyled itself within minutes.
Applejack and Rarity walked into the backyard, over to a corner of the mud area a bit away from the pigs. It was similar to the mud pit that the pony Rainbow Dash had put Applejack's bed in as a prank, but bigger.
"Well, go ahead," said Applejack.
Rarity stood at the edge of the mud. This was it. She would finally live her deepest fantasy. She'd finally know what it was like to be covered in mud, and be able to enjoy it fully without anyone making fun of her for being too unladylike.
She raised a foot, but hesitated. Her heart was pounding faster. What if she found she didn't like it? Impossible. Watching Pinkie Pie had confirmed to her that she would love it.
"Come on, Rarity, you can do this!" said Rarity under her breath. She looked as though she was about to jump, then stopped, then raised her leg to step into the mud, then stopped again.
Then, Applejack gave her a little shove, and she fell face first into the mud. Rarity felt repulsed at first, but only for a split second. It felt strangely wonderful to get mud all over her legs, her shorts, her tank top, her hair. To let down her clean-loving, prim, ultra-feminine facade and let her deepest dreams become a reality.
"Thank you Applejack," said Rarity as she got into a sitting position. "I needed that. I was hesitating too much."
Without a moment's hesitation, Applejack sat down in the mud next to Rarity, getting her tight jeans dirty. "Any time."
Rarity liked having someone to share this experience with. They playfully splashed each other with mud, and once they got tired they laid there for about ten minutes. This was more enjoyable for Rarity than she could have anticipated.
...
"Applejack?" said Rarity as they were taking a bubblebath together, fully clothed, after showering.
"Yes, Rares?"
"Could we possibly do that again sometime?"
"Of course we will. And remember, if anyone asks why you're soakin' wet, we were havin' a water fight."