Working Up a Sweat (Patreon)

"All these cupcakes are going to my ass!" Rainbow dash is mortified. She fell to temptation by Pinky Pie's sweets and came to... just grab a bite or 2? or was it 3? Regardless, it was enough to make her ass cheeks balloon, with each clop making each cheek bounce off another. One could say she has mixed feelings about all of this. Feelings of discomfort, but also an arousal of sorts. "I've brought moOOoore!" Pinky Pie sings. "I see you've enjoyed my latest recipe! RRready for this!?" "I... I can't Pinky. Look at this!" Rainbow Dash turns and shows her big butt to Pinky Pie. "I wouldn't be surprised if I can't zoom through the sky with all this in my trunk!" Pinky Pie giggles and prods her butt. "So jiggly! Jiggly like Jello!" Rainbow Dash blushes and shies her ass away. "I have to get going, I gotta work this extra weight off to maintain my shape!" Just as Rainbow Dash heads out the door, we can hear our poor Pinky Pie whimper. After all, she did make these special muffins for her. "I'll take one with me, it wouldn't hurt after all" Rainbow Dash says as she grabs a muffin and goes. "YAY! I knew 'borrowing' this potion from Twilight's place would really set me up for even more tastier treats!" Speaking of her Doors crash open in Pinkies house as Twilight Sparkle Crashes in. "PINKY!" Twilight Exclaims. "You didn't perhaps sayyy take a potion, from my house, and that potion, a VERY DANGEROUS ONE, used it in some of your recipes?" "Uhhh, no?" Pinky says, as the fresh muffins she makes slide onto the wastebin. "This new potion was for Checker's project, I've told you time again that using my potions for baking is a bad idea!" Twilight checks the bin, noticing the aroma of the muffins matching that of the potion she concocted. "I know, I know, but I only use the nice smelling ones, Rainbow Dash even loved its flavor, hmmphh!!" Pinky Pie says, puffing up her cheeks. "You WHAT!? Twilight Screamed. Moments later, 6 ponies, Twilight, Rarity, Checkers, Applejack, Pinky, and Fluttershy gather. "What's all the hubbub!?" Applejack questions. "...I think we're here because Rainbow Dash might be in trouble" Fluttershy says. "I'm sorry guys, I just wanted to bake something delicious for you all." Pinky says in a sad tone. After a bit of getting reacquainted and explaining a bit, Checkers speaks up. "If I may interject, we should try finding her soon, worst case scenario, she can get really sick or maybe like grow an extra limb. Good case scenario, she just grows massive, but we'll just have to search for her and find out." "GOOD SCENARIO!? What is this potion for!?" Rarity Exclaims. "It's to make fat asse- change your fate excessively." Checkers nervously says. "I've discussed making this with Twilight, but it is incomplete. we must find her and see the results and if she's ok! Anyone have any ideas where she could be?" Everypony looks a bit puzzled by this question, but faces Pinky Pie for an answer. "Uhhh... Ieee... Oh Right! She said something about maintaining her shape, she could be racing by herself in the clouds to work off the extra pounds!" "There's no time to lose then, let's make our way there! Twilight says. Everypony now sets out to where Rainbow Dash could be.
    "I'll admit this doesn't feel bad, but I do feel a bit slower!" Rainbow dash soars through the clouds, testing her speeds since she's eaten all those desserts. "Oh I almost forgot about this one!" In one bite she swallows the muffin. A pulse of energy emerges from her. "Mmmfgh!" She moans as this erotic experience makes her feel powerful. "I should've ate this sooner, let's go another lap around the sky. Soaring through the sky, she notices that she's getting faster and faster. " This is aMAZING!!" Unbeknownst to her, she was going faster, but also growing bigger. Larger. She moaned as she soared, pulsating bigger, getting stronger and faster, working up a great sweat. The ponies have finally reached Rainbow Dash's checkpoint for her laps. "We can wait here a bit and see if she'll arrive. She must be here!" Twilight said. A thundering moan stretches across the sky. "Good heavens! What was that all about? Rarity questions. before anyone could react, a dark blue wall falls from the sky. Bwoooing! The blue wall was none other than one of Rainbow Dash's sweaty cheeks as she laid down for a rest. Drips of sweat from her excessive flying came down. Though the pressure of her huge ass cheeks came down hard, it was like layers and layers of mattresses on top of you, soft, and bouncy. "Unmmhff.... I've got to grab another one of those muffins.... huff... that felt incredible!"

Here's a request I promised to fulfill long ago, with another angle of Rainbow Dash! It's definitely been a while, so the new artwork comes with a new story! I hope it's better!
Request and Checkers (OC) are from LilCheckerPone!