Celestia's Secret

“Luna, you absolutely need to get new panties...” Celestia said as she rummaged through her sister’s panty drawer. “All of these are so, well... old! And don’t get me started on your bras!”

“Yes, well, I like old!” Luna yelled back at her sister from her place on the bed. “So what if I don’t wear anything super fancy like you?”

“But you are the definition of cute and sexy! Someone of your status should not be wearing such dreadful things.” Celestia grabbed all of Luna’s undies and brought them out into her bedroom. “These briefs are at least a thousand years old!”

“Thousand and four, sis.” Luna sat up, her thin T-shirt barely hiding her ample bosom. “Sure, they’re old, but that preservation spell you taught me before, well...” Her smile faltered as her little incident with Nightmare Moon crept into her mind. “Anyways, they still fit, and I like them.”

“Well, you need to buy some new ones that are not so... archaic. Give me a few seconds; I have to raise the sun...” Celestia smirked as she dropped all of her sister’s panties onto the floor. She lit her horn, took a deep breath, and performed her daily duties. Taking a very, very small fraction of the sun’s energy, she channeled that power on Luna’s undies, setting them aflame.

“Sister!” Luna said in mock shock, her ears flicking back as she watched her panties and bras turn to ashes. She pouted and bit the inside of her cheek as she looked up into her sister’s teasing gaze.

“Um... woops, clumsy me?” Celestia tried to keep herself from laughing, but couldn’t stop a giggle from escaping past her lips.

“Now I only have one pair to wear!”

“You sure about that?” Celestia asked with another giggle. She lit her horn, then teleported the pair of her sister’s panties that she was wearing over the side of the balcony.

Luna’s eyes narrowed as she reached a hand down the front of her shorts. “Oh... you are so going to pay for that!” she said, a silly grin on her face. She ruffled her wings and crossed her arms under her breasts as she stared up at her sister.

“Oh, I have every intention of doing so,” Celestia said. She teleported away with a pop, then reappeared several moments later. “Here, go buy yourself some new undies,” she said, tossing Luna a nicely-sized bag of bits. “There is a nice lingerie shop a few blocks from the castle’s gates that I like to visit every once in a while. Why not go and buy some cute new undies? I do have one condition, though...” she said, letting a smirk slide on her face.

“And what might that be?” Luna asked, cocking her head to the side as she hefted her new bag of bits.

“I would absolutely love it if you could model for me, showing off each and every pair that you buy. You know...” She sat down next to her sister and draped an arm over her shoulders. “We could put on a show for our guards...” she whispered, kissing the side of Luna’s neck. “Testing their resolve to not move an inch... and with the right outfit, more than a few would be rock-hard...”

Luna smiled as her eyes drifted shut, feeling Celestia’s hands run down to her breasts. “Hehe, let me guess.... Next you are going to suggest that we bring a couple back to your room for another night of passion?”

“Only if you want to... it has been so long since I heard you cry out in pleasure...” Celestia grinned as she sat back.

“It has been a while, yes...” Luna stood up and walked into her closet. “However, I shall only do that on one condition.” She picked out a light yellow sundress, changed into it, then found her favorite pair of sandals. Luna twirled in front of her mirror, blushing lightly when she saw how exposed her perky butt was. If an errant breeze came along... Should I put my shorts back on? ...Nah. Celestia said it would only be a few blocks away, so I think I will be fine...

“Oh?” Celestia asked, mildly surprised.

“Yeah, you have to come panty shopping with me! You did destroy my undies, after all, and fair is fair!”

“Done! Your dress is cute; do you have any others like it?”

“Celestia’s Secret? Really?” Luna asked with a smirk, nudging her sister’s shoulder with her own. They stood outside the boutique, the windows full of mostly white lacy lingerie. She snuck a glance at her sister and smirked, for the dress she’d borrowed from her closet was one size too small. The fabric around her breasts was so tight that it was almost making them spill out around the top of the low-cut dress, and if she leaned over, her lacy thong would surely and plainly be on display for anybody to see.

“What can I say? I was not going to stop them from naming a store after me. Their panties are really cute, so how was I going to say no?” Celestia leaned in and nipped her sister’s ear. “Besides, they are the only store that truly understands my rather unique... needs, and I cannot wait to see how your butt looks in their panties...” she murmured, squeezing Luna’s butt with her right hand.

“Sister, we are in public! What if somepony saw us?” Luna asked with a light laugh, playfully swatting her hand away.

“Oh, relax... There are not that many ponies out yet.” Celestia took Luna’s hand and tugged her forward. “Come, we must get you some new undies!” she said with glee.

Without much else to do, Luna let her sister pull her into the shop. “Um... you sure we can find some cute everyday panties here? The windows were kinda full of lingerie somepony would wear on their honeymoon.” She nervously grabbed her left arm as she looked around. Counters full of a myriad number of bras ran the length of each wall, with hangers displaying the top-tier pieces above them. Looking towards the back of the small shop, she spotted several tables stacked full of folded panties.

“Oh my gosh, Princess Celestia and Princess Luna!” a light pink mare walked up to them from behind the counter in the back, then bowed before them. “It is such a pleasure to see you again, Princess Celestia! I have designed the perfect set of lingerie for you since your last visit. Would it please you to try it on? Nobody else has seen it except myself, and it will look absolutely fabulous on you!” She clasped her hands behind her back and threw on her best smile. “It could possibly be my best work!” she said, her eyes brimming with hope.

“I think that sounds splendid. Let us waste no more time!” Celestia nodded at the back. “Can you fetch it for me, please? My sister and I are here to replace her old undies, so I think we shall start with that first while you get it set up for my viewing pleasure.”

“Right away, my princess!” she said, a wide smile on her face as she hurried to the back room behind the checkout counter.

“Who is she?” Luna asked as they walked deeper into the store, heading towards where the panties lay.

“Her name is Melody, and she has quite the knack for making someone feel sexy. She likes it when I come in, and she has always made sure to make a new set of lingerie just for me by my next visit.” Celestia stopped in front of the tables covered in panties and placed her hands on her hips as she inspected the wide array of products.

“So... which ones would you recommend?” Luna asked, looking at a basic, light-yellow hipster pair of panties that matched her sundress perfectly, holding it up with her magic. Not even a second later, all of the panties in the boutique glowed with her sister’s magic.

“All of them, and we are going to try on every... single... one,” Celestia said with a smirk as they all started to rise up into the air.