As she finished her current read, Twilight Sparkle let out a contented sigh. Today had been a good day all around. A new shipment of books had arrived for the Castle of Friendship, she had been able to spend time with her friends, and of course, no Equestria wide disaster to worry about.

Something that seemed to have become annoyingly commen since she had moved to Ponyville and since Princess Luna had returned. Not that she blamed the Lunar Diarch for any of it of course.

"We really should stop calling her princess though, Twilight. I mean, we're one too," came a voice from both her mouth and in her mind. But it wasn't Twilight's own voice.

"We can't exactly call them by their regular names though. We barely know her, or Celestia. Though I like her better than her elder sister," came another voice, once again, not Twilight's own.

Twilight rolled her eyes as she felt her two companions reassert themselves within her, and then mentally kicked herself for thinking that of the two of them. They were far more than that to her.

She wouldn't even exist at all without them. In most ways, they were her mothers. Far more than Twilight Velvet, though Twilight loved the mare dearly. The Sparkle Family was the closest all three of them had in a long time.

"Please don't start calling us that Twilight. I'm way too young to be a mom."

"Oh come on Cobalt. It's not that bad. We are in most ways."

Twilight felt Cobalt roll her eyes. "Of course you're fine with it, Star. This is your kind of thing. It always has been."

Twilight giggled as she felt Star stick her tongue out at Cobalt. "Now now you two. Calm down now. This does none of us any good."

Both Cobalt and Star rolled their eyes. "Yes, mom," they said together before all three of them broke down into helpless giggles.

Twilight though was more than happy to relinquish her hold on their combined form, as all three of their magics came together, and a bright light filled the Main Library. When the light faded, Twilight Sparkle had vanished, and in her place, two new ponies now stood.

One was a peach pink unicorn mare with a two-tone mane and tail, the colors the same as Twilight's own mane and tail highlights in fact. The other was a light blue Pegasus mare. Her mane and tail were the same color as Twilight's own.

Star Twinkle blinked several times as she readjusted to being herself once more. Even after so long, it still felt weird. "You'd think after centuries of doing that, I'd be used to it by now."

Cobalt Strike stretched her wings for all they were worth. "I'm more than happy to do it instead of being up all night reading. I don't see how Twilight does it."

Star shrugged. "Must be an alicorn thing. I like my sleep, thank you very much."

Cobalt smiled as she wrapped a wing around Star. "And that's one reason why I love doing this with you, Star."

Star smiled as she leaned into the wing hug. "Oh? And I thought it was because I was cute?"

Cobalt blushed. "Well. That too."

And it was true. The two of them had been together now for so long, their initial shock and shyness at being so closely tied together had long since worn off. Not to say that they hadn't fought and split up for long periods of time. But they always came back together in the end.

Star bopped her on the nose, as they made their way up to the Main Bedroom. "Don't worry. Your secret is safe with me."

Cobalt grinned. "It better be, or I'll tell everyone your little secret. Or maybe I and Twilight will."

Star feigned shock and horror, but this had been a thing between them for so long now, it no longer bothered her. She knew that Cobalt would make good on her threat too. Either by herself or when she took the driver seat alongside Twilight when all three of them were together.

And if that did happen, there was only so much Star could do about it. Then again, the same applied for her and Twilight as well. It was part of what made all three of them work so well together. Kind of like Princess Celestia and Princess Luna in a way.

Princess Celestia may have known them the longest at this point, but there were things even she didn't know about them. And Cobalt, Star, and Twilight planned to keep it that way. Princess Luna knew just about as much as her sister did.

The only other alicorn who did know the three of them to any real extent was Princess Cadance. Why that was, none of them knew. But it wasn't something that bothered any of them to any great extent.

Coming to their bedroom, Cobalt gave Star a seductive look before she hopped into bed. Star blushed brightly before she too joined her in bed.

"So. Anything going on tomorrow?" Cobalt asked as she ran a hoof through Star's mane lovingly.

Star shook her head. "Not really. Rarity wants me to model some dresses for her. She's hoping I can drag you along with me."

Cobalt pretended to heave. "No thanks. Rainbow has it right. Dresses aren't for me."

Star chuckled as she rolled over to face her. "One of these days, I will get you in there, along with Rainbow." She batted her eyelashes. "Besides, you look beautiful in a dress."

Cobalt rolled her eyes. "Yeah, yeah. You two have fun." She looked out the nearby window. "Starlight's still out with Trixie?"

Star nodded. "She said she wouldn't be back for a few days at least. And Spike is out with the CMC for the night. Hopefully, Fluttershy can handle all four of them."

Cobalt snorted. Knowing the animal-loving pony, she could handle just about anything. "If she can handle Discord, I think she can handle those four. I don't know how, but she can."

Giggling, Star kissed the end of Cobalt's snout, getting a blush out of the Pegasus. Pulling the cover-up over the two of them, Cobalt let her wing hold Star close, the unicorn snuggling closer as she did before the two drifted off to sleep.

It was times like this, Star thought with a wince, that she wished she could change into Twilight and not have Cobalt there with her. Not that she didn't like Rarity of course. Far from it. They got along great. It was nice to be able to talk magic with somepony and have it be understood to any degree.

Even if the fashionista didn't understand all of it, she still understood the basics. She was curious the most about the magic that allowed Star and Cobalt to unite into Twilight. There were several problems though.

Neither Cobalt nor Star really understood how or why they could do what they did. And what little they had been able to figure out had never once been shared with anypony else but each other. Not even Princess Celestia. Far too much could go wrong if it did get out. Or somepony could try and use it for evil in some way.

But back to the point. Every time Star came to Carousel Boutique, it felt like her organs were squashed more than was probably safe, and she always left out of breath. Earth pony stamina only did so much.

"Rarity, why do you have to make this so tight?" She wheezed, as she was squeezed into a dress she had asked for, for an upcoming dance in Canterlot. Though technically the invitation had been for Twilight, Princess Celestia had made it a point to invite both her and Cobalt as well.

Rarity smiled as she made several adjustments. "Maybe, darling, if you got out more like yourself and not Twilight, then it wouldn't be so tight, hmm? Whatever happened to that earth pony stamina you three share?"

Star rolled her eyes. "It only does so much. I'm not Applejack. I'm a bookworm. What can I say? Cobalt usually finds a way to get me out and about though."

Rarity hummed as she returned to her workstation. It wasn't exactly a secret around Ponyville that Cobalt and Star were a couple. Very few though knew the truth about why the two of them and Twilight were so close.

All of their friends did of course, as did Starlight and Trixie. But that was as far as it went into the small town. Others across Equestria and the Crystal Empire did as well, but never spoke of it.

The relationship the three appeared to share was a surprise to most that didn't know the full truth about them. But Ponyville was one of the most open spots in Equestria for same-sex couples. Just ask Lyra and Bon Bon.

It was far more open than Canterlot was that was for certain. The capitol was as backward in its thinking, as Ponyville was forwards thinking. Nopony seemed in no hurry to change that as well.

Rarity's smile grew as she returned to her work. "Well, I do hope you get out of the castle more often darling. You can't spend all day cooped up inside like that, or even as Twilight. You'll never be in shape if you do."

Star grumbled as she tried once more to breathe.

Cobalt sighed as she settled down onto a convenient cloud. It was days like this that she was glad that she and Star had decided long ago that spending all of their time as Twilight was boring.

She loved the time they spent together as her of course and wouldn't change it for the world. But some days, she just enjoyed being herself again.

It was easier than their other method of being apart for any length of time. Cobalt remembered the century and a half that she and Star had gone their separate ways. One benefit of the immortality they now had, courtesy of Twilight. Twilight had all but retreated into the deeper parts of her mind at that time.

The two of them had come back together of course. But it had given them the perspective they had needed, and Twilight. No all three of them had come out of it for the better.

Cobalt wondered if they would ever share that story with the girls. While they may have been closer to Twilight, they were as much her and Star's friends as Twilight's. Except for Trixie. But they only put up with her for Starlight's sake.

Somedays, she wondered what it would be like to move to the Human World, and their friends at Canterlot High. None of them knew the full story as of yet, though Sunset was beginning to suspect something.

Cobalt had a feeling they would freak. As much as their pony counterparts had when they had learned the truth. It might just be worth it to show it to them, just for their reaction to it. Especially Sci Twi, who Cobalt knew wasn't like her and Star. At least, she didn't think so.

Unless there was something else going on that none of them knew about. The thought made her grin.

Author's Note

First I need to thank JanethePegsaus for letting me use part of her artwork. This isn't the full pic that's being used as the cover art. But I was able to get just this part of it to use for the story.

And that's not the only change. All of the Mane 6, not just Twilight, were fusions in the original idea behind the pic. As were Princess Celestia and Princess Luna. Celestia, in fact, being three ponies fused together into one.