It was a calm Sunday afternoon, Twilight was, you guessed, reading a book.

"Twi-Light. Must-give" panted Spike, burping out a scroll. Lifting it with her magic, Twilight read through the scroll.

Dear T.S

You must come to Canterlot at once. There is a threat. Against you. Old enemies are rising again. Be careful

Your faithful friend

This was going to be a long afternoon.

"So, that's what the letter said?" asked Rainbow Dash, after Twilight explained the contents of the letter to her friends.

"But maybe" whispered Fluttershy.

"I say you should go to Canterlot" advised Rarity.

"Um" squeaked Fluttershy.

"But what if it's just a trick!" reminded Applejack, "To capture Twilight"

"Perhaps..." said Fluttershy even more quietly.

"I've got it!" said Rainbow Dash enthusiastically,"We should think of who else has T.S initials!"

"I thought it could be-" started Fluttershy.

"Tempest Shadow" said Spike loudly.

"Great idea Spike, let's go question Temepest" said Twilight, heading out the door.

"But wait! Remember her name's Fizzlepop Berrytwist!" reminded Pinkie Pie.

"But people still know her as Temepest" said Twilight, "Come on, let's go to her house"

Temepest Shadow lived at the corner of Ponyville, so she wouldn't attract to much attention. But she still didn't ever take off her armour.

"Temepest? Are you home?" asked Twilight, knocking on the door.

"Hi Twilight, everypony, come in" said Tempest, ushering them inside.

"So Tempest, I got this letter today, addressed to T.S. I realise your name is Fizzlepop Berrytwist, but-" started Twilight.

"I was being sarcastic" said Tempest, "Tempest Shadow is my real name- sorry Pinkie Pie"

"Aww" said Pinkie, deflating a bit, but suddenly puffing up again.

"So, have a read" said Twilight, handing the scroll. Tempest read through it, her eyes scanning every word.

"I'm not sure, who it's to. I mean, it probably would be for you, but then, I also betrayed the Storm King, maybe that's what the person it talking about" Tempest said, after reading.

"I think we both should go to Canterlot, safety in numbers and all!" suggested Twilight.

"Have, message!" said Spike, burping our another scroll.

"Am I the only one who finds that kind of gross?" asked Rarity. The others nodded.

The scroll said:

My dear Twilight

There is something I need to tell you. Something that can change your life (I'm being dramatic aren't I!) Anyhow, bring Tempest along with you. You need to know.

Your loving mom, Twilight Velvet

Twilight rolled her eyes. "Seems like we'll be going to Canterlot after all!"

Twenty minutes later, Twilight and Tempest were on the train. "So, what do you think this is about?" asked Tempest, confused on how to start the conversation.

"Probably Mom freaking out about a minor issue- Don't know why she called you along though" Twilight said, "I inherited that trait from her"

When they arrived at the Sparkle residence, Twilight Velvet dragged them in. "Have a seat, both of you!" she said, "Now how do I say this- You two are sisters"

"What!" shrieked Twilight and Tempest in unison.

"Perhaps not the best approach" muttered Velvet.

"We're sisters!" They yelled.

"Well, I had Tempest after Shining, and when she was born, Star Swirl the Beared had wrote a prophecy, of a child who would be named Tempest Shadow. Of course, I had to name you that. And the Royal Guard informed the Princesses, who sent you to another village, far from Equestria, so you wouldn't be a threat" explained Velvet.

"So believe me I sure was surprised when you came to destroy Equestria. But I wanted you two to find out, put the pieces together, so I named Twilight with the same initials you had. I was sworn to secrecy, so I couldn't tell anyone, but I was devestated having my daughter taken away from me"

"Shining Armour was too young to remember, and any memory he had was removed. Speaking of, he should be coming any minute now, he doesn't know either. But now, I am so glad I have both my daughters back with me again!"

Twilight and Tempest just stared. Then they hugged there mother tightly, especially Tempest, crying and laughing at the same time.

"Hi Mom how ar- oh, did I miss something?" said Shining Armour, seeing them, confused.

"Let me say this simply- Shining, say hi to your little sister" said Twilight, pointing to Tempest. Tempest waved. Shining Armour gaped at them.

"I missed out on a lot" he whispered.

After 10 minutes of straightening things out, Shining was just as excited as Twilight.

"This is amazing! Wait, does that make Tempest royalty?" asked Shining.

"Well, technically, she isn't crowned, or married to royalty, but she is probably like a lady of the court" said Velvet.

Tempest pictured herself in the royal court in one of those large poofy dresses. "Uh, no thank you, I'm happy the way I am" she said quickly.

"But one thing confuses me- Who was the T.S letter addressed to?" wondered Twilight.

"Perhaps it means both of us- you've defeated bad guys all the time, and I betrayed them. And if it was for you, why wasn't it just addressed to 'Twilight Sparkle'? Why T.S?" said Tempest.

"I think you're right, but for now, you girls need to stay here" said Velvet.

"But Mom- I can call you Mom, right?" Velvet nodded, "We have work in Ponyville!"

"May I ask what work you have?" asked Velvet.

"I'm trying to get my cutie mark with the help of the crusaders" muttered Tempest.

"What was that?" asked Shining.

Tempest sighed. "After I realised I was better off alone, the Storm King's army found me, and convinced me to join them, and use there cutie mark, one that unified them to the Storm King's side. I saw a chance to show everyone what I could do, and my long lasted problem of needing to search for my cutie mark was over. So I never got a Cutie Mark"

"What? According to my studies, it is not possible for a pony to not have a cutie mark" Twilight said.

"Yeah, that's why I'm working with the CMC's to get a cutie mark" Tempest said.

"Well, I think we should help you get your mark before running off to save Equestria!" suggested Twilight.

"Yeah, save Equestria... wait, what?"

Author's Note

Something I came up with a short while earlier. I was reading some My Little Pony the Movie fun facts, and it said that you might notice, Tempest and Twilight have the same initials. And then I was like, "Oh yeah! Why didn't I notice that?"

So then I thought it would be fun to do this. Please leave any kind of feedback, comments, likes, (preferably ;P ) and dislikes.