[TW: Suicide / Self-harm]
Note: Quotation marks around normal words indicate that Sunset Shimmer is talking out loud. Italicized words inside of quotation marks indicates Demon Sunset is talking out loud. Italicized words without quotation marks indicates the thoughts of Demon Sunset and are not being vocalized.

A few hours earlier:

“Dear Celestia, what have I done?” Sunset paced back and forth through her apartment. It had only been a few hours since she had lost everything at the dance.

From the looks of it, not a whole lot. You’ve spent most of my energy so there isn’t a whole lot I can do for the time being.

Sunset glanced towards her mirror. In it, stood an image of herself, albeit acting entirely on its own. The demon stood staring at her with an annoyed look on her face and a scowl on her lips. All of the planning they had done for years since fleeing to the human realm had evaporated in a single evening and there was no way for them to put the cat back in the bag. It happened in front of the entire student body and staff, meaning her friendly facade no longer held any sway.

“I’m a failure. An utter failure”
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“Can’t disagree there, you certainly screwed the pooch, as the humans like to say.” Demon Shimmer pulled a nail file from thin air in the reflection and plopped on the bed in the mirror. “We’re just going to have to go back to square one and rethink the entire plan. Certainly going to be much harder now that Celestia is aware of what we’re doing and will more than likely keep a close eye on both the crown and the portal. But nothing worth doing is easy, is it?” she asked rhetorically.

She glanced up from her pointless filing to gauge Sunset’s reaction. The girl didn’t seem to be paying attention to her at all anymore and instead was focused on her phone. Tears welled up at the corners of her eyes. Demon Shimmer arched her eyebrow inquisitively. Sunset, you know that’s just how I am, don’t start losing it because I’m acting like a bitch. Still, she exhibited no reaction to her words

If you want to get pissy, be my guest. Don’t think that you can ignore me though. You and I are bound together “til death do us part,” we’re two sides of the same coin, yin and yang, etc.

“Perhaps that’s how it should be,” Sunset whispered quietly as she threw her phone down onto the bed and slowly made her way into the bathroom and closed the door behind her. Demon Sunset just stared after her, not bothering to relocate herself as she didn’t really have the desire to see the girl use the toilet. Soon enough, however, the sound of running bath water could be heard albeit muffled by the wooden door. The demon thought nothing of it at first, but the strangeness of the situation quickly crept its way into her mind as the minutes continued to tick by.

How often have I seen Sunset take a bath in all the time I’ve known her, she posed herself. The only time that comes to memory was that night years ago when Sunset had tried… She gasped. Sunset wouldn’t try that again. Everything has been on the upswing hadn’t it? Yes of course… until the calamity that had been their scheme had been undone tonight.
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Demon Sunset willed herself into the bathroom mirror, and what she saw before her looked like it had be pulled right from the script of a horror movie. Sunsets clothes were strewn across the bathroom floor while she herself was laying motionless in the bathtub. The water was tinged red from blood. Next to her bleeding arms was a razor. The demon slammed on her side of the mirror in desperation to rouse Sunset from her near-death stupor.

“Damn it Sunset! Wake up! You are not dying here today! Get the fuck up and get out of that goddamn tub! Do you hear me? DO YOU HEAR ME?!” The girl seemed to move a little, stirring hope within the Demon. This was dashed when she realized it was just Sunset slipping into the water more until her head was almost completely submerged. “GOD FUCKING DAMN IT SUNSET! GET YOUR ASS OUT OF THERE RIGHT THIS SECOND OR I SWEAR TO CELESTIA HERSELF I WILL PULL YOU OUT MYSELF, AND I ASSURE YOU IT WONT BE PLEASANT!”

Her threats rang hollow without a corporeal form to back it up but the Demon was in a near frenzy now, out of an equal combination of self-preservation and concern (though she would never admit to the latter). Time was running out, pretty soon there wouldn’t be enough blood left in Sunset’s veins to sustain her body. The being in the mirror bit her lower lip so hard that small droplets of blood were slowly running down her chin. She shook her head, it couldn’t be left up to Sunset to save herself, so she was going to have to do it herself.

The demon closed her eyes as tightly as she could. Expending what energy she had managed to recover so far, her will was pushed to its absolute limit, and eventually beyond. Her sense of self faded into the magical Aether…
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With a sudden gasp of air Sunset Shimmer stirred from her coma, splashing water out of the tub as she flailed around trying to concentrate. Her body felt weak and limp, but she pulled herself out of the crimson pool and stood groggily on her legs. To survive she was going to have to move fast. She burst out of the bathroom and into her bedroom with a stagger.

Blood continued to run down her arm, but at a slower pace. Ignoring her garment-less body, she made it to her desk and flung open the drawers and pulling out anything and everything. Darkness began to creep into her vision, but she luckily found what she needed. The sowing materials fell onto the desk as she desperately tried to thread the needle with her pervasive tunnel vision.

At last the task was accomplished, but now came the painful part. She grabbed the wooden ruler from the main drawer and shoved it quickly into her mouth. “Aggghhhh!”, she cried. Every dip of the needle into her torn flesh was pain on a level she had never before none. With each weave her teeth bit down harder into the ruler until it was on the verge of splintering. Pulling the string taut caused another rush of seething agony, but everything was sufficient for the moment.

“Damn it Sunset, I wasn’t ready to take control of your body again, but you gave me no other choice! What explanation do you have for this? Huh? Huh?” The demon paused awaiting some kind of response in the back of her head where Sunset’s mind would be resting.

No response came.

“Sunset?” Her tone fell from a fit of rage to an annoyed tone.

Still no response.

Rather than wait she probed for the alternate consciousness within herself. But she found nothing. There was no soul or mind other than her own, other than the demon’s. Sunset Shimmer was gone. Her body had been in the horrific state for too long and the mind had offered no resistance to the beckoning call of what lay beyond.

As the realisation hit her, Demon Sunset was overcome with a million different emotions, but all receded as the adrenaline in her vessel wore off and she collapsed limply onto the floor, naked.

Author's Note

I wasn’t happy with how weak and brief my initial 2nd chapter had been and I found myself somewhat inspired to write a better version. There are likely tons of errors and misspellings, but please remember I wrote this on my phone’s notepad and am finishing it up at 4 a.m. I’ll come back and edit it later when I can see my screen correctly. Anyways, I hope you find it better than before.