Celestia was laying on her couch next to the fire place. The red flames produced a lot of heat which was good, Celestia didn't want to freeze again. She shivered. The last time she was frozen had been unpleasant. Nearly 50 years trapped in ice wouldn't kill her but it was cold.
A knocking came from her door.
"Who is it?" Celestia called out. Under her breath she mumbled "And this was such a good book."
What shook her to the core was when her balcony door opened. In stepped a dark blue mare she hadn't seen in over 100 years.
"Why sister, I am glade to see that you enjoy the book I lent you so long a go."
"Lulu? What are you doing here?"
Princess Luna went and nuzzled her older sister.
"Am I not aloud to commune with my sister? The moon council can take care of itself for a night or too."
Chuckling Celestia moved to the side to allow her sister to lay next to her.
"Nay dear sister, but there is something you might want to see." Luna walked back to the balcony. "No... Something you need to see dear sister."
Celestia rose an eyebrow at this. Getting up she went to the balcony as well and stood next to her sister and looked up to the sky. The black clouds wept snow in torrents, it was nearly a full blizzard.
"I am sorry Luna, but the clouds are far to heavy for sky gazing tonight. Perhaps you could hold off and show me tomorrow?"
Luna shook her head. "No, it cannot wait. You need to see this dear sister. It will only last tonight."
"Luna, I cannot have you stop the snow. Hearts Worming Eve is in a few days."
Luna only closed her eyes.
"Lulu?"
When Luna opened her eyes it was like white fire. "No sister. You will agree this is what must happen. You will never forgive yourself if you missed this."
Celestia was slightly miffed and taken aback by her sister.
"Luna, what could be more important then the happiness of my and Twilight's ponies?"
Luna felt the fire of the night racing through her, the moon, the stars and meteors all filled her with there power. This was more power then she ever touched before, more even then Celestia had dealt with. But she knew she had to do this, for Celestia.
"Luna?" Celestia took a step back. She could Feel the power radiating from her sister.
"This"
And with that Luna released every ounce of power she had falling to the ground as the lunar shock wave blasted the clouds away.
The night was full of cosmic wonder, the stars shone brightly, the moon was red and in harvest, the cosmos danced with color.
Then it appeared.
Celestia gasped, her breath stuck in her throat. Her vision tunneled and her heart stopped. Yes, this was more important then her beloved ponies, her land she cultivated from barren fields, even the relationships she made with those she loved now.
A black and white shooting star crossed in front of her eyes, and circled around the moon.
"Once every ten millennium..." Celestia whispered.
Luna was crying softly, curled next to her sister.
"Mother, father." Luna cried. "I'll never forget you..."
For that night only, they weren't thousands of years old. They didn't rule a kingdom, Luna didn't rule her moon colony, Celestia didn't have ambassadors sleeping from a hundred different nations. They were two fillies, who loved there mother and father.
And would never see them again.