After yesterday's ordeal, Derpy was hesitant. No one had been able to help her yesterday; what made today any different. "I dunno, Twilight. I thought you said there wasn't anything in your books."
"Well, that was before I talked to Zecora." She began rummaging in her saddle bags as she talked. "You see, she reopened my eyes to the possibility of repurposing a different spell for an entirely different end. For example, if you use a transmogrification spell for..."
As Twilight continued explaining in her own verbose way, Derpy turned to her daughter. "She seems...confident. Maybe she can help me."
"But Mom, what do you need help with?" Dinky cocked her head.
Derpy tussled the filly's mane. "You'll see." She turned to Twilight. "I'm ready to try."
"...but, of course, that only works on Tuesdays, because...oh, you want to begin?" Twilight planted her feet. "This spell uses the same energies as a cure for the common cold, but redirected towards your eyes. Stand still."
"Uh, sure. Now what?"
"I'm not sure." Twilight's eyes glowed white as a majestic purple beam shot from her horn towards the mare's face. Neither pony wavered, and the beam stayed steady. Dinky watched in silence. She was in awe, but also terrified. After exactly 21 seconds, the magic light faded. Panting, Twilight hung her head. "Did...did it work?"
"I don't know. The mirror's upstairs." Derpy began to walk to the stairs, but stopped as she reached them. "I...I think it did!"
"How can...can you tell?"
The elated mare dashed back to Twilight. "Because I can see the stairs clearly!" She turned to Dinky. "Honey, can you believe it? I can see!"
"That's nice, Mom, but I thought..."
"I'm gonna go get a muffin!" Without so much as a goodbye, Derpy had blasted out through the front door, completely missing the door frame. Inside, Twilight was recovering her strength, a smile on her face. "Well, I'm just glad I could help?"
"What do you mean, help?" Dinky stamped her tiny hoof indignantly. "You made her eyes all wrong!"
"I don't understand. She said she wanted her eyes fixed. Is that not correct?"
"No! She wants people to like her! And now I don't like her, and I don't like you!" She ran upstairs to her room, as mad as can be. Twilight stood in shocked silence.
"C'mon, let's go see what kinda fun is happening in town!"
"Pinkie? I didn't realize you were still here"
Pinkie laughed. "Just because the writer doesn't give me lines doesn't mean I left. Last one to Town Square is a Blank Flank!" She took off like a rocket, with Twilight following at a more reasonable pace. After all, she wanted to see her own handiwork, but she wanted to get there in one piece.
Meanwhile in Ponyville, Derpy touched down outside Sugar Cube Corner without so much as a puff of dust. The door was closed and the window shuttered, unsurprisingly. She knocked on the door and waited patiently. The mail slot opened and a pair of eyes gazed upon their potential customer.
"I'm sorry, sweet roll, but...by Celestia, what happened to your eyes?"
"Twilight fixed them," Derpy beamed. "I'm cured. Here, watch." As easily as can be, Derpy showcased her ability to walk 10 paces without tripping.
"Well, it does look like you are...reformed. And I shouldn't turn away a customer. C'mon in, dumpling." Cautiously, Mrs. Cake opened the door, and, to Mrs. Cake's surprise, Derpy entered the shop without running into a single thing.
"Can I have a muffin?"
"Um...I suppose so. What flavor would you like, gumdrop?" Slowly, Mrs. Cake was trading her expression of shock to one of relief.
"I like all your muffins, Mrs. Cake. Surprise me."
"I guess it's only fair to return the favor." She perused her shelves, then reached for a wooden box on a high shelf. "Here, this is a special muffin, created with zap apples and a special ingredient: some of the last supply of Discord's chocolate rain. I call it...the Zap Zonday."
"Wow, thanks!" Derpy set her bits on the counter. "So, what's the damage?"
"Not today, sprinkle," Mrs. Cake said, tears begin to form. "This is in celebration of your recovery."
"All right! Well, I gotta jet. Rainbow Dash needs help with the clouds, and I think I finally ready to help! Bye!" She once more passed through the doorway without incident, and rose high into the sky towards the cloud line. Mrs. Cake stood in the entrance, watching the mare fly away. As she watched, Pinkie came rocketing by, but retraced her steps back to Sugar Cube Corner.
"Hey, Mrs. Cake! Have you see Derpy?"
"Have I ever! She came into my shop, and she didn't make a mess! It's a miracle!"
"OK. Bye!" She took off once more. Soon after, Twilight trotted through town, also stopping at Sugar Cube Corner.
"Mrs. Cake, did Derpy come by for her muffin?"
"That she did, fritter. She seemed so happy."
Twilight shook her head. "I only hope that when she returns home, Dinky will be as happy."