This is my first story so go easy on me, I wanted to do this because I only saw one other person did a story based on the mlp comic (reflections) (I didn't have time to read it) I hope you enjoy this!
Celestia looked at the chip of the mirror hanging on a small tree she kept in the castle. She remembered how he had sacrificed himself for equestria, for her. She remembered how they had gotten back and Luna had fainted. She remembered Luna thinking it was a dream and she had gone along with it. She remembered his eyes, looking into hers.
"Sister!" Luna came running in with a stern look on her face "Come, it is time to set the sun and have the moon rise, we will be late"
"Oh yes…" Celestia got up. "I'm coming" She said with one last glance at the tree, with the precious chip of mirror hanging on a small branch.
"I don't see why you like that tree so much sister, it's a tree!" Luna said
"You wouldn't understand" Celestia looked at her hooves
"No, no i wouldn't"
Once Celestia had set the sun and Luna had risen the moon, Celestia went to bed and Luna had to watch over the land of Equestria.
THREE HOURS LATER…..
In a dark room, empty, except for a wooden frame of a mirror, one simalar to the one leading to the human world, but this one, this one had lead to a different dimension.
Suddenly a bright golden light flared and from out of that light stepped a dark grey unicorn stallion, wearing a purple cape and a crown atop his head. His green eyes sparkle, he looked around and relized He was in the Cantorlot castle, so very similar to the castle he used to live in. He used his magic to open the door and walked out.
"Halt!" A unicorn guard said "This is private property. Who are you?"
"I am King Sombra. Would you please let me pass, I need to see Celestia"
"King Sombra!" The guard whispered in the guard next to him's ear to 'tell Princess Luna King Sombra has returned and wants harm Princess Celestia!' The younger guard nodded and rushed off to find the princess of the night
"King Sombra! You are not welcome here!" Luna said with her head held high
"Luna! Don't you remember me?" Sombra said
"When you tried to KILL me? Yes! I do, very much!"
"I never did that!" Sombra telleported himself right out side of celestia's door, Finding it was locked and the guards were still persuing him, he blasted it open
Celestia looked up and saw him "Is it really?"
"Yes. I never stopped thinking about you" He said. Celestia fainted and he ran toward her, only to be hit by Luna's magic and fall on the floor
"Bring him to the dungeon" Luna said in a cold voice "THEN FIX THE DOOR!"