The Yin and The Yang

Somewhere in Equestria:

         "Finally, it is time," a hooded figure walked up to a painting depicting Nightmare Moon and Princess Celestia's battle. The figure chuckled coldly, "history is about to repeat itself."

           A yellow mare screamed in pain. Finally, after 9 months of waiting, her first child was about to be born. Her husband, a dark blue pegasus with an light blue rock cutiemark, named Moon Stone, reassured his wife, "it will be alright, Dawn, our baby girl is coming, just a little more, push a little harder," he cooed, stroking her orange mane. Soon, the mare let loose another scream, and out came a little filly. She had a coat, mane, and tail whiter than snow, with a single black streak running down her tail. This, however, wasn't what amazed the doctors. The small filly had not only wings, but she also had a horn. The doctors had seen nothing like it! But, before a single word could be uttered, the mare let loose another scream, followed by the arrival of another filly. This filly was also an alicorn, much like her sister, but that was where their similarities ended.

           This filly had a dark black coat, mane, and tail, with a streak of white down her tail. This filly was also slightly smaller than her sister. "This is a phenomenon!" The doctors yelled in suprise, "not only one alicorn filly, but two! The princesses must be alerted of this immediatly!"

           Dawn Stone, in fear her fillies might be taken away, asked, "may I hold my girls, please?" Her voice was barely a whisper. The befuddled doctor, who had forgotten all about the presence of Moon and Dawn Stone, simply nodded. Dawn allowed herself a small smile, as she used her magic to lift the fillies up and into her hooves.

"You will be Yin," she nuzzled the white filly, "and you, will be yang," Dawn nuzzled the black filly. The two alicorn foals squirmed in their mother's hooves, unaware of the utter evil awaiting their arrival.