Cloudsdale: 15 years ago
“She’s your new baby sister,” Sky’s mother, a red Pegasus mare, said to a five-year old Sky.
“Where are the leg holes, Mom?” Sky said confused at the lack of leg holes. He remembered that his “super secret skin” had leg holes.
“Oh don’t be silly, Sky, ponies don’t have leg holes,” Sky’s mom, said while winking, hoping her son would get the hint.
“Is there something in your eye, Mom?” Sky said, obviously not getting the hint.
“No, son,” She then said while taking a glance towards the green Pegasus stallion, her husband, next to her. “Foals and their imaginations, right, Cloud?”
Cloud Sprinter smiled and responded, “So hyperactive his imagination is, Candy.”
Cloudsdale: 9 years ago
“Sky! Stardust! Come see your new baby sister!” Sky and Stardust’s mother called to the other room. The six-year old Stardust, and eleven-year old Sky, immediately made their way to the baby room of the cloud house.
When the two reached the room they were greeted by their father and mother, their mother putting a small red foal into a crib. “Say hello to Redwind Sprinter,” their father said.
The two walked over to the crib and then peeked over the side. Redwind was sleeping soundly. Sky knew how important the secret was by this point and he knew that neither his sisters nor his father could know or mass craziness could ensue…
Ponyville: Present Day
Sky timidly walked through the hall following Twilight. I knew this was gonna happen! Why didn’t I prepare more!? He thought to himself. A few minutes later they reached the opening hallway of the castle. Before they rounded the corner, Sky composed himself and kept on following when he heard shrieks, a combination of fear and surprise. He certainly could taste the fear but there was a smidgeon of confusion mixed in. He immediately hit the “Fluttershy Position” which is the position Fluttershy usually assumes when she’s scared by anything. Cowering between hooves or wings, in this case hooves, shaking, and a wee bit of whimpering to top it all off. Using a hole in his legs he took a quick glance towards his two sisters talking to Twilight. He could taste quite a bit more confusion being mixed into the mix at the moment.
“HE’S A WHAT!” he and everypony in the hall, heck maybe even all of Ponyville, heard Stardust yell.
He moved his eyes away from the hole but he could hear Twilight talking to his sisters. There was soon a sound of hooves going near him so he clenched up hoping to make himself as small as possible.
“Hi Sky,” he heard Redwind say. The kindness and sincerity surprised him enough to make him look up. “Princess Twilight says that you are a nice changeling, but if you are the same Sky as the one who helps me get ready for school then I already know.”
“B-but I’m not even a real pony, I’m a bug compared to normal ponies, my cutie mark isn’t even real,” Sky said incredulous that Redwind was so fine with Sky’s true form.
“You are the same big brother as before, even if you have bug eyes and holes in your legs, and a horn,” Redwind said smiling.
“Th-thank you, Redwind,” Sky said as his eyes teared up. Then he and everypony in the room were surprised by Redwind suddenly hugging him.
Sky was stunned by the sudden hug but he was able to get a look at Twilight and Stardust. Behind the massive amount of love being radiated from Redwind, which should feed Sky for weeks, there was a small amount of betrayal and hostility radiating from Stardust mixed in with her indecisiveness and confusion. Twilight was talking to Stardust who didn’t look like she was in the mood for listening.
There were tons of emotions swirling from the two ponies; there was so much emotion around the area that Twilight’s massive apple-like-in-taste curiosity was a mere hoof-note compared to the entire mix from the Sprinter Sisters.
Once Redwind released him from the hug, Stardust approached. She didn’t look him in the eye; in fact she seemed to be looking past him, as if trying to keep from seeing him.
“Hi there, Stardust,” Sky said timidly.
Suddenly Stardust’s tactic changed and she was now looking straight into his eyes, almost like a lesser version of the Stare. “I have a few questions for you, if you really are Sky Sprinter,” she said to him.
Sky nodded in assent, but he knew that no questions could show that he’s not the real Sky Sprinter since he was, well, the real Sky Sprinter.
“Where were you born?” Stardust asked.
“Cloudsdale,” Sky replied.
“What job does our mother have?”
“She currently works a small candy making and delivery service.”
“What job does our father have?”
“He works at the weather factory, mostly rain-related functions.”
“What are our parent’s names?”
“Our mom’s name is Candy Runner and our dad’s name is Cloud Sprinter.”
“When we first arrived here in Ponyville, who did we meet first?”
“Pinkie Pie, and the party she threw was quite a bit of fun, even for a introvert like myself.”
“Who were our first real friends here in Ponyville?”
“The Doctor and Derpy Hooves.”
“What job do I have?”
“You are a mail-mare”
“What job do you have?”
“None, but I’ve thought about trying to be a weather pony or something like that.”
“Who is Redwind’s best friend?”
“She actually has three, Applebloom, Sweetie Belle, and Scootaloo.”
“How old are the three of us?”
“I’m twenty, you are fifteen, and Redwind is nine.”
Suddenly the emotions coming from Stardust changed to a great amount of confusion and indecisiveness with a small speck of that sweet, sweet love that Sky missed.
“Alright, I’ll believe you. If Redwind and Princess Twilight believe you then I guess I have no need to worry about being deceived, right?” Stardust said before embracing Sky in a tight hug.
“Stardust, I’m-“ Sky said before being interrupted.
“I don’t wholly believe you, changeling-who-may-be-my-brother, so I’ll be watching you. If you do anything that makes me doubt that you are truly Sky, then I will make sure your flank lands in a dungeon deep under the ground, and if that fails then I will find a way to make you suffer,” Stardust said quietly under the guise of the hug.
Sky was equally relieved and saddened. On the one hoof his sisters didn't hate him, but on the other hoof, Stardust wasn't 100% trusting of him.
The hug ended and Stardust turned to Redwind and said, “I think we’ve spent enough time here to get reacquainted.”
“But Stardust, we haven’t seen him in so long,” Redwind complained.
“Sorry Redwind but I’ve got some overtime I need to do and I’m sure the Princess here is too busy to watch you,” Stardust said.
“Actually I’ve got plenty of time on my hooves, despite being a Princess; the Princess of Friendship actually doesn’t come with all that many responsibilities as compared to the other three who either run Equestria or the Crystal Empire.” Twilight interjected, “I can watch your little sister since I’m already watching your brother anyways, and also it’s a good way to make sure Sky’s been telling us the truth, nothing ever brings the truth to light quite like family members.” She personally knew that as was seen during the whole wedding invasion situation less than a year ago.
“Can I stay, Stardust? Please, can I stay?” Redwind pleaded.
“Oh, alright, if the Princess here is alright with it, just be careful and behave,” Stardust said.
“I will,” Redwind responded,
“Alright, I’ll see you in a couple of hours,” Stardust said, “Thank you, Princess.”
Stardust zoomed out of the castle out to fulfill those overtime hours. Sky then asked himself, “What kind of overtime does a mailmare do?”
Twilight interrupted his thinking and said, “Alright, where were we? Oh yes, the examination, if you wish to, Sky. We could continue tomorrow if you would like.”
“Oh no, its fine, we should get over this now anyways,” Sky answered.
“Alright, let’s step back into the examination room, you can follow if you’d like to Redwind, if not then Spike can show you around while me and Sky finish this up,” Twilight said.
“Ooh, I want to see more of Sky,” Redwind said following them.
Sky was sure he wasn’t gonna enjoy this part of the examination but he hoped that the information for ponies eventually helps the standing of changelings to ponies. Perhaps it can even make it so that the secret is unneeded.