Rarity is not stronger than Applejack, its just that Applejack realised this gets her aroused and its enjoying herself getting dominated by Rarity.

I like this

@Deon Miller  
I love it more when Fluttershy gets submerged

@mudlove  
I LOVE it when they get all submerged!

Muddy girls ooh so pretty and dirty

Aaaaand I’ve found a new fetish :3

Applejack: “Rarity! Rarity, time out, I think one of the straps broke!”  
Rarity: “Oh no, you challenged me to this, you’re tasting defeat!”

@Background Pony #9877  
I wasn’t trying to say she was stronger, only strong.  
AJ is the strongest…but a brawler against a wrestler is an easy bet to make.

@Background Pony #9877  
straight up stronger, yeah, you’re probably right.
 
but a better fighter? well that’s something else entirely.

@Background Pony #9877  
But she will be if it’s funny.

@DAPLR  
Yes, and AJ stopped a runaway, six-seat carriage with 4 ponies in it by herself. Sorry, Applejack does hard, manual labor on a daily basis, there is no way in hell Rarity is stronger than her.  

@BigBadSeed  

 
Not only is Rarity repeatedly shown to get quite physically violent when she deems it necessary, she is also very physically strong, as said by spawnofhastar, by carrying a giant boulder.
 
And if we bring the comics into this, then she is an EXCEPTIONALLY talented wrestler!

@Deon Miller  
Mud baths in mud pits alone aren’t particular believable because of the lack of subtlety. I make a few exceptions for the sake of fun, but it’s better if the scenario is in-character enough to justify characters jumping into the mud and making a mess out of themselves. For example, Fluttershy would be more likely to jump into a pit to save a trapped animal (and if she has wings she would simply fly over the pit). A mud monster might also work to a point.
 
The story could go like this: If a baby bear (or any beast for that matter) is written in as the animal getting trapped in the pit and pulled to safety by Fluttershy (who can probably fly over the mud if she has wings) before she is grabbed by the mud monster, the baby bear can repay her kindness by calling its mommy (who may be likely know Shy) to fight the monster and rescue Shy in turn. Until then Shy can be written to be slowly covered and engulfed by the monster, and her clothes torn in the process (all without explicitly being sexual of course).
 
It’s all about the subtlety.

@ Deon Miller
 
I like the you’re idea.

@Kakapo  
Know what I’m thinking of?
 
If I were to draw some mud for practice, I’d make pictures of Fluttershy taking a mud bath, and somehow, a mud monster takes her in. That, or the mud monster would be Harry the Bear pranking her and comfort her.

@spawnofhastur  
What a shame. If I was able to identify that wrestling move I would have appropriately corrected the mud-covered parts of Applejack’s body. Applejack would had been almost entirely covered from the front, unless Rarity had her on the lock while she’s knelling.

@BigBadSeed  
I dunno. Rarity feigns delicacy, but she’s got a hell of a lot of punch. She didn’t have many issues carrying Tom, for example, and I full expect she’d fight dirty.

@spawnofhastur  
Even so, what I find impossible about this, and pics like it, is the mere thought of Rarity overpowering Applejack.

@Background Pony #8ADB  
It’s not that difficult, but you have to do it when they’re face down on the floor. Youtube ‘mexican surfboard’; it’s a move that’s used in professional wrestling.

Damn, this is brutal.

LOL mud wrestling!!!!! XD

Kinnikumareeeees, go fiiiiiiight… <3

@Background Pony #8ADB  
When was that a thing in the fandom? I’ve been missing out.

@BigBadSeed  
In Rarity’s defense (and King Kakapo’s I guess) it’s a fandom thing that it’s long been thought that Applejack is an Antaeus from the Hercules legends. The only way to defeat him is to hold him off the ground long enough to crush him. Or in this case, pick the apple-red bikini off her like an apple from a tree, fulfilling one of the points requirements of mud wrestling- like strip poker. But yeah, how the heck do you do that with your feet?!