The Prompt: One of the Mane Six is actually the Doctor.
Fluttershy stood in the doorway of her cottage, looking absolutely perplexed. Twilight should have expected such a reaction, really. The concept of what she was saying was pretty ridiculous in its own right, but to tell it to Fluttershy of all ponies was downright silly. Fluttershy was a nice, quiet pony who kept to herself. She had no idea exactly what it was that prompted her to even ask her about the situation at all, but she had to be thorough and ask absolutely everypony, even if doing so made her look a bit nutty to her closest friends.
"Um..." Fluttershy said, finally breaking the silence. "I'm afraid I have no idea what you're talking about, Twilight. Sorry." Twilight sighed and nodded.
"Right," Twilight said. "Sorry for taking up your time."
"Oh no, it's no problem at all," Fluttershy responded with a small smile. "I'm sorry I couldn't be of any help."
"Don't worry about it, Fluttershy," Twilight said, starting to turn around to leave. She looked back over her back at Fluttershy. "If, by some strange chance, you do hear anything about this Dr. Adorable, will you let me know?"
"Of course," Fluttershy said, looking away slightly. Twilight gave Fluttershy a smile and a nod, then headed out, on her way to the house of the next pony on her list.
Fluttershy breathed a sigh of relief as she closed her door. It was hard lying to her friends, especially her. Looking into those big purple eyes and lying straight to her face nearly shattered Fluttershy's heart. She reflected on this as she pulled a lever next to her door. A trap door opened under her, and down she fell.
"Oh Twilight," Fluttershy said as she hurtled down the well-lit tunnel. It had been completely dark at one point, but that scared her too much. "I'm so sorry, but it's for your own good. You'll find out when the time is right." Fluttershy flumped into the gigantic butterfly-shaped pillow that she always left under the chute. She gazed around the laboratory. She'd been in Twilight's lab before, and was proud to say that hers trumped that of Ponyville's most studious and possibly most intelligent resident. She pulled her lab coat on, then donned her goggles, letting out a tiny "eep" at the snap. She stared forward into the camera that she used to keep records of her efforts.
"Some day, I'll be able to tell you the truth," Fluttershy said. "And then we can be together, and you can be my faithful cohort." She took a breath, reaching a wing out to press the button on the nearby sound system. "I'll make everything extra-adorable for you." The music began playing, and she looked straight into the camera again.
"Library day
Down the lane
Next to books
Studying
Wanna say
Love your mane
Here I go
Worrying
With my cute ray I will fluff your world
With my cute ray I will
Fill our home with pretty birds and
You saw me once
Looking at
Rainbow Dash
...Just a phase
Unicorns
Are the best
I love their horns...eep...
Anyways
With my cute ray I will warm your heart
Not a friendship ray or a party cannon
That's all Pinkie Pie
I think I need to tell you why
I'm the mare you need to date
I think TwiShy is really great
My cute ray will bring you to me
We'll make the whole world squee!
That's the plan
You and me
Cutesy snugs
Every day
I love your plot...
Oh my...I...um...this room is hot!
...Anyway
With my cute ray I will cute..."
Fluttershy shut the camera, blushing hard. "Perhaps some of those lyrics need work..." she muttered as she slid off of her seat and went to work on her creation.