“Quit laughing already, will ya?” Rainbow yelled, wincing at the higher-pitched and even more scratchy quality to her voice. She flapped her tiny wings, only to fall head-over-hoof and land with a muffled thump on the sofa. Letting out a groan, she scrambled to her hooves and glared at Twilight, who was not-so-subtly hiding her giggles behind a hoof.
Rainbow pouted and crossed her now-miniature forelegs over her chest with a small huff, sending Twilight deeper into her giggle fit. “I-I’m sorry,” Twilight said between giggles. A wide, mirthful grin had spread over her face.
“It’s not funny!”
“No, it’s not really, but...” Twilight managed to regain her composure long enough to trot over to Rainbow. Rainbow glared up at Twilight, who now towered over her. “You’re just so adorable!”
“I’m not adorable!” Rainbow protested, struggling to get out of an all-consuming embrace Twilight wrapped her up in. She broke free of Twilight’s hooves and landed with her wings spread and her chest puffed out. “Will you just fix this? Please?”
“Okay, okay.” Twilight raised her hooves placatingly before walking over to her desk. “I’m sure there’s a reversal spell in here somewhere.”
Stumbling over her own hooves, Rainbow clumsily made her way over to Twilight and sat down in front of her expectantly. “Good!” She inspected her wings while Twilight read. Were they ever really this small when she was a foal? She groaned and pouted again. “How’d you even do this, Twi?”
“I don’t know,” Twilight said, looking over her desk at the now-filly-sized Rainbow and smiling. “The spell was supposed to help with reducing the stress in your wing muscles, not shrink you down to a foal.”
“Yeah, well, it did. And now I’m stuck like this.” Rainbow hung her head. Thoughts of what Applejack or Pinkie or anypony would say if they saw her like this filled her mind. She swallowed thickly. “You can fix this, right?”
Twilight’s face softened and she trotted around her desk to Rainbow before wrapping her wing around her. “Of course I can.” Rainbow took comfort in the warmth of Twilight’s wing as Twilight levitated a book from her desk over to her. “And I think I found just the spell for it.”
“You did?” Rainbow asked, her face instantly brightening.
“Yes, I think so.” Twilight nodded her head and her horn started to glow. “A ‘regrowth’ spell that should do the trick.”
“Then what’re you waiting for?” Rainbow sprung away from Twilight. “Get me back to normal already!”
“Alright.” Twilight shook her head, a playful smile playing across her face. “Okay, now this might tingle a bit...”
A few seconds later followed by a blinding flash of light, Rainbow did indeed feel a tingling sensation as it felt like her entire body was being stretched out. She blinked open her eyes and was met with the sight of a smiling Twilight Sparkle standing at eye-level. Rainbow extended her wings, and grinned when she saw that they were restored to their normal, fully-grown length.
“Aww, yeah!” Rainbow cheered before flapping into the air. “This is more I like it!” She landed next to Twilight and blew a tuft of orange mane out of her face. “I have way too much awesome for that little foal body.”
“Maybe...” Twilight leaned in and captured Rainbow’s lips in a quick kiss. “As cute as the foal you was, I think I prefer this Rainbow Dash. Kissing a foal would have just been weird.”
Rainbow huffed but drew herself closer to Twilight. “I wasn’t cute, alright? I was radical.”
“I don’t know.” Twilight grinned impishly and wrapped her hooves around Rainbow’s neck. “You looked pretty adorable. And you know what?” She darted in and pecked Rainbow on the cheek. “You still are.”