Luna's Secret

by ThunderDasher07

Rating: mature
Tags: Princess Celestia, Slice of Life, My Little Pony: Friendship is Magic, Princess Luna
Length: 1262

Luna has a secret that no pony knows about except her sister, Princess Celestia. So what happens when she shares that secret with somepony. WARNING: story contains diapers and Infantilism age play.

Luna has a secret that no pony knows about except for her older sister. So what happens when she shares that secret with somepony. WARNING: story contains diapers and Infantilism age play.

Published 2013-04-07 18:00:02 UTC
Last updated 2013-04-07 18:00:02 UTC

1: An Old Friend

The moon shined brightly as it lit up the darkened room in Canterlot Castle. The dark sapphire blue pony that was Princess Luna trotted very calmly across it. She came to a chest and opened it. The mare used her magic to pull something out from inside. It was a stuffed bat, old and worn. Luna’s face turned into a smile as she hugged it. “I missed you, Mr. Fuzzy.” The princess trotted over to her bed and climb into it. She fell asleep hugging the bat close to her.

Luna slowly began to come out of her sleep. As she became aware of her surrounds, the mare realized she felt damp and her eyes shot open. There was a large wet spot on her bed. Luna’s face turned pink, “Oh no, I forgot last night…” She heard hoofsteps coming towards her room and the sound of her sister’s voice. “Luna, are you up yet?” Poking her head in the room, Celestia said smiling, “Good, you are.” She trotted closer to younger sister. “What’s wrong,” she asked, concerned.

Seeing the dark mark on the bed, she goes over to comfort her. “Oh Luna…,” the older mare said. “I’m sorry, I forget last night.” as she began to shed a few tears, Celestia said, “It’s ok. Everypony forgets something at one time or another.” “Tell you what, how about I get you ready for the day and change these sheets. Would you like that Woona?” The older sister tickled her a little. Luna giggled and said, “I would Tia.”

She walked over to a tabled laid down on it. Celestia used her magic to get a light blue diaper from underneath. She clean Luna up, put some foal powder on her and taped the diaper on her. “There you go baby sister,” she said. “Thank you big sister,” the younger mare said, hugging her. Luna got down from the changing table and used her magic to grab something nearby. It was a pacifier and she happily started sucking on it. The older sister put new sheets on her younger sister’s bed. Princess Celestia began leaving the room with the wet sheets. “Now call me if you need anything, Woona.” Luna nodded her head as she continued sucking the pacifier.

Luna crawled over to a small red table that had pieces of paper and crayons on it. She magically picked up one and started drawing. After a while, she had drawn a cute picture of Celestia and herself. The princess smiled at it. Luna's smile became wider as she began to feel a sensation. The bright blue color of her diaper started getting darker. She suckled her pacifier faster. Luna sighed in relief as she finished wetting her now soaked diaper. She grunted as she began to fill the back of her diaper. The blue alicorn pony only just finished when she heard the voice of her older sister.

“Hello Luna.” Her natural dark sapphire blue face turned to a shade of dark red because she knew what was about to happen. “Smells like somepony needs their diaper changed.” Luna turned her head to face Celestia. “Am I right, Woona?” she asked. Luna could not hide the expression on her face. “Yes, I do.” She then says in a voice imitating a little filly, “Yes, little Woona needs her… diapee changed.”

After changing her, Celestia said, “I originally came in here to see if you wanted some lunch. You must be very hungry.” The blue alicorn nodded her head. “Ok,” she said as she levitated a bottle to younger sister. Celestia cradled Luna in her hooves while feeding her. The diapered princess suckled on it very slowly as the white alicorn gave her a big smile. When the moon pony was done, she said,

“Milky good.” “I’m glad you liked it,” the older mare replied. “I luv woo Tia.” Luna said as she nuzzled her sister. “I love you too little one,” Celestia said. Suddenly, the younger pony remembered, “Oh, I have something to show to woo.” “What would that be Woona?” she asked curiously. Luna levitated the drawing she made for her older sister to see. Upon seeing it the image of her and Luna, she begins to tear up.

“Oh… Luna… this is… wonderful.” “I love it,” she said as she embraced her sister in a hug. The younger sister gave out a cute yawn. “Awww… ” Celestia said smiling. She cuddled the blue alicorn.

“Is little Luna sleepy?” She asked her. Luna nodded her head. The lunar princess trotted over to her bed and gets under the sheets. The solar princess gives the younger mare her bat plushie and pacifier. She hugs Mr. Fuzzy and suckles her pacifier. The older sister smiled and said,

“Have a good nap Woona.” She kissed her cheek and Luna blushed. Celestia giggles. “I’ll come back and wake you. Ok?” Luna simply nods her head with her pacifier still in her mouth. Celestia shuts the door behind her.

About an hour and a half later, Celestia returned. She opened the door and went to Luna’s bed. The blue pony was still fast asleep. “Oh… I hate to do this to her,” she whispered. “She looks so cute and peaceful.” “Luna… Luna, it is time to wake up.” The younger pony slowly opens her eyes.

“Did you sleep well?” the solar princess asked. The sister nods her head. The older sister felt her diaper. “Your diaper is wet. Do you want me to change you?” Luna nodded her head and said, “Yes.” She trots over to the changing table and gets on top of it. Princess Celestia changed and put a new diaper on the younger mare.

“Thanks Tia,” Luna said. “You’re welcome.” She replied. “T-Tia…” Luna said. “Yes, Woona?” she replied. “Can… can you play with me?” The younger sister asked in a cute little voice and gave big puppy dog eyes. “Um… well…” Celestia started to say and then sighed. “Oh… alright. I can’t say no to that face.” The dark sapphire blue alicorn smiled and hugged her.

“Oh, thank you Tia.” She said. “What do you want to play?” the older sibling asked. “Blocks,” she said pointing a set of blocks. Luna trots over to them and starts to playing them by making a tower. Celestia then noticed something about the tower. It spelled out ‘I love you Tia.’ The white mare began to cry a little.

“I love you too little sister.” She gave her hug. “It’s almost dinnertime, are you hungry?” the solar princess asked. Luna nodded her head. “What are you hungry for?” she asked. “Banana.” The diapered pony answered. Celestia takes out a jar of mushed bananas. Takes a spoonful of it and levitated toward Luna.

“Ok, here comes the train.” She feeds the food to her and until she is full. “It has gotten late. I think it’s time to put this little filly to bed.” The older sister said as she began tickling her sister. Luna laughed a little bit. “Ok, Tia.” She gets into bed and hugs Mr. Fuzzy. Celestia puts the sheets on her and gives her pacifier. “Good night Woona,” the white mare said. “Good night Tia.” Luna said muffled through her pacifier. She leaves; Celestia looks back at her cute younger sister and smiles. “Sweet dreams,” she said. Luna closed eyes and fell asleep.

Author's Note

This isn't my first fanfiction, but my first story on this site and I would like to see how I'm doing.