The Yin and The Yang

I don't get it...what's gotten into her lately? I mean, she's always been a little reclusive, but now she's being an outright loner. She doesn't hang out with other fillies anymore, even me. Lately it seems as if she hates me. That can't be right, although on the morning of the Gala, she shot me a look of pure hatred, what did I do to deserve that? On top of that, there's the nightmares, the tossing and turning, and eventual screaming. Guards rush in every time, but she says that she's okay. What I find to be the worst part of this, is that she won't even talk to me about them, she just brushes off the topic. We talk to each other about everything that's on out minds, so why all the secrets?

I look to the bed next to me. She's tossing and turning again. That's it, I need to tell Princess Luna. She'd do the same for me, and maybe Princess Luna's power to enter dreams can help Yang out.

                                                                         ~~~~~~~~~~~~~

"Yin, what is the matter?" Princess Luna asks as I approach her after breakfast.

I explain about Yang and her nightmares, all the while Princess Luna's expression becomes more solemn. " and  pleeeeeaaaase don't tell her I told you this," I beg.

"If you insist, then I shall tell her that it was not you who informed of her nightmares when I enter her dream tonight," the princess assures me.

"Thanks, Princess Luna!" I shout as I leave the room. Maybe her nightmares will stop, or we'll at least see what they're about so I can help her.

                                                                           ~~~~~~~~~~~~~~

I can't focus for the rest of the day. I can't stop thinking about what her nightmares could be about. I barely acknowledge Princess Celestia when she says, "Alright Yin, tomorrow morning you'll come with me to help me raise the sun," one of her eyebrows raise when she notices my lack of attention, "and maybe you'll get your cutie mark for raising the sun."

This jolts me out of my daze, "My cutie mark?! Really?!"

Princess Celestia smiles, "Maybe, and tomorrow your sister will help raise the moon, so she might be getting hers as well."

My smile widens, "So wait, we might be getting our cutie marks, on the same day?!" This I could hardly believe, not only are we gonna get our cutie marks, but on the same day! My line of sight finds the door. Is Yang just as excited as I am? I see it now, tonight we're going to stay up all night and design our cutie marks. I want my sun to be really swirly and big. I can't wait to hear what she wants hers to look like.

Princess Celestia shakes her head, "Now Yin, I don't know if that will be your cutie mark,"

I won't give up that easily, "But Princess Celestia, you said that we are destined to raise the sun and the moon, right?" She nods, and I continue, "then they have to be our cutie marks, there's no other logical explanation!" Princess Celestia smiles, as if remembering somepony else she knew, but I don't care, I dart out the class room to meet Yang.

"Did ya hear?! We're raising the sun and the moon tomorrow! And we might get our cutie marks!" I tell her.

" You mean that you get to raise the sun, right? And I have to raise the moon." She spat out those words with so much bitterness, it surprises me. She looks down and shakes her head, "Look all I want to do is go to bed and sleep, so please l-leave me alone," and she walks off, leaving me in front of our classrooms with my jaw hanging open.

                                                                     ~~~~~~~~~~~~~~

After her outburst, I hardly care when the thrashing starts to come from her bed. When I can't stand it anymore, I get out of bed to start shaking her awake. Once my hoof reaches her back, my eyes widen. I'm no longer in our room. This room is much darker. In the distance, I see Yang with an older pony, and she looked terrified.

This must be her nightmare, but we've never met that pony before. How could Yang know such a tall pony other than the princesses? I run towards the pair, and I'm about to call out to Yang, when figure stops me. It's Princess Luna, her eyes glowing blue, "Do not move any further, Yin." Her voice takes me aback. There's no kindness in it, as before. It's cold and merciless.

"Amazing, isn't it?" This time, it is not the princess that speaks, it's a pony in a black cloak. He trots up to Princess Luna, "Even now, I can still take control of her mind," he chuckles, "just as I'm about to do to your sister and you."

"Who a-are you?" I ask.

He sheds his cloak, I realize that he isn't even a pony, more like a shadow of a pony, "The answer to that is simple, my dear, I am, and always will be your worst nightmare."

"W-what do you want with me?" The question slips from my mouth.

"Simple," he answers, "This time, all of the pieces will be mine, and so will Equestria,"

Pieces?! Is this..this thing...implying that...that...no. I won't let it happen. If he wants to hurt my sister or the princesses, he'll have to go through me first. "There's no way I'll let you hurt anypony!" I yell. "We'll never help you take over Equestria!"

It smiles, "Silly filly, you act as if you have a choice, Nightmare Moon will return, and this time nopony will be able to stop her, I'll control your 'princesses' and you, by using your own shortcomings," his gaze pierces me, "you should know, good and evil is what you're named for."