Celestial Surrogate
The princess of the night awakened to a colorful sunset, it was almost time for the moon to rise. But first thing was first for Luna, she needed to check upon her elder sister Celestia, princess of the sun. She stretched her arms, her hooves, and her wings out as the last few months have been more than busy for both of the princesses ever since Celestia announced new heirs to be born into Equestria. That time was nearing, and the more time that passed, the less the princess felt ready for the newest royal offspring.
"Just...a few more weeks," Princess Luna yawned, "And then things really begin to pickup."
She scratched her head as she began dressing in her royal attire. When she slipped on her dress, she noted the position of the sun, she had at least thirty minutes left, but she knew Celestia would still be working hard, even during her given predicament. Leaving her bedroom, she marched down the castle halls into the throne room, where a meeting was underway.
"Will these royal children take your place??" "What effect will they have on pony kind?" "Why did you agree to such a big responsibility?" Only a few of many questions being asked by the meeting staff. The gravid princess groaned from the never-ending questions, but the sight of her sister thankfully saved the day.
"Ah, I'm sorry but we are out of time everyone," she announced with a kind smile, "Please, if I haven't answered your questions, come back tomorrow first thing in the morning when the castle re-opens."
The guards escorted the chatty group out of the throne room leaving her and the only other princess in the castle alone. When the doors shut, the kind smile quickly dissipated into one of annoyance and relief.
Luna couldn't help but giggle from the expression, "Another day of royal duties, sister?"
"Those weren't royal duties, those were frequently asked questions," she retorted, "Wonder if I should leave an FAQ outside the throne room?"
"That would be a bit more efficient, sister, but where's the fun in that?"
"Back almost a year ago when I wasn't pregnant." She sighed as she sank into her throne. But she couldn't slide too much. Her figure had grown much larger than anyone expected. Her curves had grown outwards along with heavy swelling inside her bust. And the womb had grown to a size wider than the thrown she sat on, creating much discomfort during the day. So much so that her dress no longer dragged onto the ground and was lifted by her shape.
"Well your job's done. Time for the princess of the night to take over. Hm?"
"It's the most welcoming feeling these days, really," Celestia said as she attempted to lift herself off the thrown. Luna came to her side to lift the rest of her up. Now on two hooves, she carefully descended down the throne stairs onto the runway.
"Are you sure you don't need a wheelchair?" Luna asked, "The castle can assist you when needed."
"I've told you a hundred times, Luna, I will carry this burden until the day finally comes. I only need some rest for every concluded day." An impressive feet, seeing as though her bedroom was high above in a castle turret.
"Perhaps this is the day you'll finally ask me for assistance up those stairs?"
No words came from Celestia's voice as she had remembered the last few times being a bit straining to her body. "...maybe this one time?"
Luna sighed in relief, "I was hoping you'd finally say yes. If you fall at least once, I wouldn't forgive myself."
With a hand around her sister's gravid body, they both climbed up the tower to the royal bedroom. Luna unlocked her door, let go of her sister and plopped to the side, "Now you have an idea of what you'll be dealing with if you ever decide to have kids," Celestia taunted.
"Yes, well, I will be smart and ask for a bedroom closer to the throne, thank you very much."
Luna picked herself up as the pregnant princess took off her tiara and shoes and carefully landed onto her bed, "Sometimes I think this bed is my closest friend these days."
"You sure your closest friend isn't screaming for mercy, sister?" Luna chuckled as she went to a nearby dresser, "It's been reinforced twice this year."
Celestia ignored the comment as she waited for her sister.
"Alright, let's get you ready for bed. All of you, I mean."
Luna had grabbed a new set of underwear, an extra-large one-piece pajama garment, and a bottle of lotion and set them up on the dresser. She then returned to her gravid sister and began pulling off her dress.
"Are you ready to go another size up, sister?"
"I'm ready to go back down. And even then it won't be back to a flat stomach."
"Yes, some of the natural motherly disadvantages is buying larger and larger clothes and even underwear," she says as she helps untie the bra and slides a new pair on as quickly as she could without letting her sister see her face of embarrassment.
*"Mothers...goodness, what would mother have said if she saw me now?"*
"Hrr--maybe to--HNG--lay off the cakes," Luna replied, grunting to remove the panties off.
Celestia groaned, "Why did I agree to cake testing when I became princess?"
"So we may all chuckle to remind ourselves of that one filly incident where you ended up on a school paper."
Luna helped slip a new set of underwear and pajamas. Her sister had finally been dressed but she wasn't done just yet. She moved down to her legs and started getting the kinks out.
"Remind me again why you have ME do all this extra work for you?" Luna asked, "No other servant was brave enough for such a responsibility?"
"Without feeling awkward 24/7 standing next to a heavy princess, I suppose." They both shared a laugh at the thought of insecure guards not tough enough to get this personal with either princess.
Only one last task remained for Luna. She grabbed the lotion and approached her sister who lifted her pajamas up to her chest. She them proceeded to use the entire bottle upon her gravid stomach and started smearing its contents around.
"Sister, if you get any bigger, I may need to start using two bottles every evening!" she complained.
"Now now, sister, you know this stuff is the only way to treat my pregnancy."
"What, not more cake?" Luna tried to hide under her breath.
"And no, not cake. It takes lotion, castle staff and family to bring in the future of our kingdom. Besides, I think "Aunt Luna" suits you very well."
"You're very kind, sister but I am not sure if these children will look up to me like many of your followers."
The sun goddess lifted her head to see her sister, "Luna, you're going to get as much time with the kids as much as I will. You will never be left alone again. I give you my promise."
Celestia's stomach shined from the lotion but it slowly faded. Luna looked out and remembered what time it was. She went to the balcony and with her power, brought forth the moon for the world to see.
"I'll be sure to re--," she stopped and noticed her sister already snoring loud enough for the castle to hear her. She went up to her sister and covered her in the bed sheets, "Rest well, sister. I know you will make a great mother in return."