You weren't there this time
A few years have past and Luna had not heard or seen any sign of the dark figure. She felt it unnecessary to tell Celesta about that strange encounter. Luna was no longer a filly, she had become quite a charming young mare. However, the Princess of the moon was not interested in any colt or mare, be they pegasus, unicorn, alicorn, or earth pony. Luna only found interest in three things; the moon, the stars, and her sister. She was at work every night creating designs in her stars. Some of her creations were symbols for ponies that she had known and lost. Luna's parents dance across the night sky every night. The moon glowing, almost like a star itself, with her love.
This was Luna's true passion, but the other duties called. She was only grateful that Celestia was by her side. Tia was always busy with her Princess duties, that Luna often worried for her sister. Celestia was so young and yet she had bags under her eyes. Luna was more than aware that having to raise and set the sun, take care of her ponies, and swallow her pride when others looked down on her, was a lot to deal with. Luna would do her best to lessen Celestia's work load, but the ponies would prefer Celestia over her.
You weren't there this time
Life was hard for a little filly like Luna. She would have a hard time making friends. She was an alicorn, so there was always something about her that no pony would like. The pegasus ponies hated her horn, the unicorns hated her wings, and the earth ponies would ignore her completely for beinging an "abomination of nature". Luna would try her hardest not to let anypony get to her, but there were times when she could not fight the dark emotions growing inside her. There was hope for little Luna still.
She had only wanted to play a game of tag. She had not expected them to push her into the prickly bushes that cut her wings. "Oops sorry freak!" A filly called behind his shoulder. The other ponies had laughed at her, but they had soon scattered when a guard charged toward them.
"Princess Luna we must get you to a healer, your wings are bleeding." Luna had barely heard him. She was trying not to cry, trying to think happier thoughts. She did not need those ponies anyway. The walk back to the castle was noisy as the guard could not stop fretting over the Princess. Luna knew he was lying, he didn't care for her at all. It was all just some big show to gain some sort of trust.
"Stop talking. The wounds on my wings are not important. Leave me be, I can get myself to the royal healer on my own." The guard soluted and scurried away. She didn't need pity from anypony. It was worse when the pity was forced. You're a fool. Luna jumped from her thoughts. "Who said that?" Luna looked around to find that she had been too lost in her own thoughts to see she had walked into the deep forest. She could see no pony nearby but the voice spoke again. It's no wonder you have no friends. You're truly pathetic, not even the animals would pity a worthless Princess like you. "Show yourself coward! If you want to insult me then say it to my face!" Luna was searching and found that not so far in the shadows stood a dark figure. The cold shining eyes on the figure shook Luna to her core. "Who are you?" her voice wavered.
A flutter of wings caught Luna's attention. She looked up to see her sister land in front of her. "Luna? I heard you shouting. Are you okay?" Luna looked over Celestia's shoulder but the figure was gone. "What happened to your wings dear sister? I shall escort you to the healer immediately." Celestia wrapped a wing around her sister and guided her away from the shadows of the forest. Luna began to calm herself. She was okay, she was safe and warm wrapped in her sister's wing.