Ponyville, three years ago...

Darkness. Pitch black surrounded every corner, consuming it in the nothingness it entailed. A scared voice echoed within the dark, calling out for help...

W-where am I?

-eed...

W-WHO'S THERE!?

-st feed...

Please, I'm scared! Where are you?!

Suddenly, a lone mirror appeared in the depths of blackness, far away from the voice but not far enough that it wasn't seen. It spotted the new object and began approaching.

Please...scared...

You're scared, too? the voice asked, still cautiously trotting towards the mirror. Maybe I can help...

Can...help...maybe... the mirror was mere feet away from the voice now.

What's your name. My name is Fluttershy.
the voice, now known as Fluttershy's, was directly in front of the mirror now. It seemed there was a cloth covering its reflection that went unnoticed before.

...Name? My name is...

Looking around, she admired the quietness of this newfound darkness. It's actually very quiet in this place. It's very serene... she smiled, grasping the cloth obscuring her reflection

Fluttershy lifted the cloth away from the mirror, staring at her reflection almost slack-jawed. What stared back was not what she was expecting. Her ears were replaced with conical ones, better for hearing; Her hair was matted and unkempt, her feathered swan-like wings were replaced with leathery bat-like ones, her teeth now had fangs, but the most shocking of them all? Her kind teal eyes were replaced with predatory crimson ones.

...Se-Rene...

She looked around for the source of the voice before glancing back at the mirror. She gasped in shock as her twisted reflection cocked its head in curiosity. It was no longer mimicking her; it was becoming aware...

Selene? she misheard the voice say. W-what a lovely name! Fluttershy smiled nervously at "Selene".

...Lovely! The reflection bared its fangs at the mare, eliciting a terrified yelp from her.

Eep! I'm sorry!

I'm sorry!

Suddenly, the darkness was purged with a blinding light, fracturing the mirror and letting loose part of Selene...

Fluttershy awoke within the fields of Sweet Apple Acres, confused as ever. "What happened?"

"I'm so glad you're back, Fluttershy!" Twilight exclaimed.

What happened? Her newborn vampiric conscience, Selene, echoed...

Author's Note

Useless filler content, ill probably do these between every two-parter to add some unnecessary context for flavor.