The Moon Has One-Sixth Normal Gravitas

Luna fought to keep composed. She was juggling the sun and moon, trying to keep them balanced, trying to keep everypony in Equestria from knowing something was wrong. Her seat squirmed under her, hot breath tickling Luna’s dripping lower lips. Moving the sun was starting to get to her, making her feel heat deep inside. It was a furnace stoked by the tongue pushing up inside her, so deep she wondered if her sister was part giraffe. It would explain the long neck.

As if she could hear the stray thought, Celestia’s tongue rubbed against Luna’s button, with such sudden intensity that Luna nearly dropped both sun and moon, the shadows shifting a fraction of an inch as the sunset dipped, her shaking knees having a hard time supporting her own flank, much less a star.

“Careful, Luna,” Celestia teased. “I’m only getting started.”

“What’s even gotten into you?” Luna asked, sweat dripping down her neck and other fluids besides sweat dripping down her thighs. “Usually you seem reluctant to begin anything with me.”

“Princess Cadance reminded me that it’s important to let you know that I love you,” Celestia said. “Every part of you.”

“Even the naughty parts?” Luna asked.

“Especially those.” Celestia punctuated her statement by driving her tongue back into Luna’s cleft, the tip finding a spot that made the younger sister freeze up and clench around the invader. The corona around her horn doubled, the sun and moon vibrating in the sky as Luna fought to hold them still.

Celestia pulled Luna down onto her face, not letting her little sister escape. She attacked that sensitive patch of nerves and need inside Luna, lashing her tongue against it and making her sister moan with the rhythm of her attentions.

Luna lost her balance, slipping back until Celestia’s magic caught her, tingling warmth that spread her legs apart as effectively as any physical restraint, giving Celestia access to press even deeper.

Celestia coaxed Luna’s fluids out, drinking her sister’s sweet arousal. It came out of Luna in an almost continual stream as her inner walls clenched and tugged and begged wordlessly for something to fill them, latching on to Celestia’s tongue like a lifeline and trying to drag it deeper.

When her sister’s tongue withdrew, fighting against that pull, Luna almost sobbed, her body shaking and weak, too close to the edge to control herself.

Celestia hushed her sister, planting a kiss on her winking clit.

“Be careful, Luna. You need to gently put the sun down,” Celestia said.

Luna was about to retort, but her reply was cut off as her lower lips were spread wide, her sister’s magic invading her body. It felt like a thick, hot rod of pure tingling sensation, fitting into her perfectly.

“Isn’t that better?” Celestia asked. “I can feel you clenching around me, Luna. How long has it been since you had a stallion?”

“Y-you know how long,” Luna gasped, gritting her teeth and trying to get the sun low enough that she could just drop it. Every time she was ready to start moving, Celestia slammed her magic deeper, the edge of her field kissing Luna’s innermost barrier.

“All those seasons without your sister’s loving attention…” Celestia licked Luna’s button and that gentle touch sent her over the edge.

Luna cried out, clenching hard around Celestia’s magic, her body trying to milk it like a stallion’s cock, her body demanding a filling of sweet seed. Her eyes fluttered, and her horn winked out. The sun and moon dropped.

Luna fell onto Celestia, the support vanishing and the firm fullness inside her disappearing at the same time, allowing her arousal to coat Celestia’s face.

Celestia licked her lips. Her muzzle was soaked. She mumbled something into Luna’s cleft.

Luna managed to move to the side, her knees still weak. “What?”

“I said you need to be more careful,” Celestia said, her horn glowing. She pulled her sister into a hug, kissing her deeply, both of them tasting Luna’s excitement as Celestia finished moving the sky through sunset and into night.

“Perhaps you should punish me,” Luna suggested. “I made you do all that work!”

“Perhaps I should,” Celestia agreed. She used her grip on Luna to push her to the ground, turning her onto her belly and straddling her like a stallion mounting a mare. “You get distracted so easily, Luna. Even when I’m trying to punish you, I can smell what you really want.”

“And what do I want?” Luna asked, her voice husky and needy. She arched her back, pressing her lower half up and into Celestia, trying to rub against her.

“You want somepony to breed you,” Celestia whispered. “You know what advice Cadance gave me? She said I should hold you down and give you a foal.”

“Ah!” Luna gasped. Celestia’s teeth found her ear, nipping her. She was feeling even warmer inside now, the dirty talk working her back towards terrible need. “She- she would never say that!”

“Oh? So you want to dominate me and make me your mare? You want to ride me until I beg for your foals?”

Celestia’s magic played around Luna’s slit, spreading her open again and moving her hips, slapping her thighs against Luna’s like she was a stallion slamming home against her. Luna gasped at the sensation, bucking instinctively.

Her sister nipped at her mane, holding her still. Luna felt herself submitting, lowering her shoulders and raising her hips, pushing back when Celestia thrust again, magic sliding all the way home and filling her completely, pushing out in every direction and stretching her like nothing else ever could.

Every impact sent Luna’s arousal spilling onto the balcony, dripping down her legs. Every slam home sent vibrations through Celestia’s body, and she rubbed against her sister, leaving a trail of her own heady arousal.

Luna shuddered and cried out wordlessly, wings standing at attention, shivering with every muscle tense as she came harder than she ever had before, like molten lead surging through her body and erasing her thoughts.

Celestia pushed into her one last time and held it there, keeping a firm grip on her neck and holding her in place as Luna struggled and rode out the throes of her orgasm. When she finally let out a shuddering breath and started to get control again, Celestia guided her to the ground, stepping to the side to lie next to her.

Luna needed a few moments just to catch her breath enough to speak again.

“That was amazing,” she said. “I never felt…” she sniffled and nuzzled into Celestia’s neck, needing to be surrounded by her sister’s scent after the hard fucking. A part of her that had been part of ponies since the very beginning drove her to that closeness, to accept Celestia as her other half.

“I love you too,” Celestia whispered, resting her head on Luna’s.

Luna sniffled, trying to hide the happy tears in her eyes.

“It is almost too bad there aren’t spells that could actually get one of us with foals,” Luna said, trying to lighten the mood. “It would be most amusing watching you try to keep Equestria running with a swollen flank.”

“Who says there aren’t any spells like that?” Celestia asked.

“W-well, even so--” Luna blushed.

“I happen to still have the books in my private library,” Celestia said. “I had them moved after I found a certain former student of mine reading them. She was too young to understand the intent of the contents, even if she was more than intelligent enough to understand some of the spellcraft.”

“I sense a story behind that. Should I ask Twilight Sparkle just what she did?”

“I have a better idea,” Celestia said. “Why don’t you go get the books, and we’ll see if you’re a quick enough study to cast it correctly.”

Luna recoiled in surprise, eyes wide.

“You mean…?” she asked, glancing at the bookcase visible inside Celestia’s study.

Celestia turned onto her side and raised her leg, letting Luna see her needy, swollen cleft, lips pink and winking with desire.

“Don’t make me wait,” Celestia whispered.

Luna bolted for the bookcase.

When their blood cooled and they could lie next to each other without feeling the burn of desire overwhelming their senses (which took some time, as both of them had a rather incredible amount of stamina), it was deep into the long hours of the night. Celestia held Luna there, on the balcony, and the wind slowly blew across their sweat-streaked forms, carrying the sounds of the city along with it.

“I remember when it would be completely silent at this hour,” Luna whispered.

“A thousand years ago,” Celestia muttered into Luna’s mane, her voice muffled.

“Do you remember when all the ponies of Equestria were in one city?” Luna asked. “All of them in one place, hiding behind a wall. I kept them safe at night, and you kept them safe during the day.”

“It wasn’t all the ponies,” Celestia reminded her. “Just the ones we could keep safe from Discord. Even the Crystal Empire was larger.”

“And then we found a way to defeat him, and all the ponies left.” Luna shifted against Celestia, resting her head on her sister’s collarbone. “They didn’t need to be protected anymore, but we still kept our vigil.”

“There were always more threats.”

“And watching for them, we fell apart. I forgot how much we needed each other.” Luna sniffled and rubbed her eyes. “I was jealous, because I only saw how much work was left for me to finish, and not how much you had taken onto your shoulders.”

“And you were so good at cleaning up the messes I left you that I forgot how much you did on your own,” Celestia said. She raised Luna’s chin with the tip of her wing so she could kiss her sister on the lips, a kiss between equals and lovers.

It went on until Luna’s tears had dried up.

“I won’t ever forget again,” Celestia said. “I love you.”

“And I love you.”

“How would you like to do something crazy?” Celestia asked, grinning. “I’ve been considering something, and it’s the perfect time for it.”

“Considering what?” Luna asked.

“We’ll run away somewhere and get married,” Celestia said. “A ceremony in some tiny town in the middle of nowhere, with only the locals invited. No press, no papers. We’ll just be Luna and Celestia again, and forget the titles and paperwork.”

“We cannot just leave! What about…” Luna cringed. “Taxes?”

“Don’t ruin the mood, Luna. I have a plan. We’ll just have Twilight Sparkle take over for us. She’s perfectly ready to run the nation, and she’ll have her friends to help her. Goodness knows she can always try asking Star Swirl. He should have been helping us, but instead he vanished.”

“To be fair, he vanished into Limbo,” Luna said. “He didn’t plan on leaving.”

“And it was a mess because he didn’t plan!” Celestia countered. “We won’t leave her a mess. Everything is running just fine, there are no awful looming threats, and we can always check up on her.”

“But what are we going to tell her?” Luna asked. “We can’t let her know we’re getting married or it will immediately leak to the press. And no offense to the mare, the last time she was asked to assist with a wedding it turned into an enemy invasion.”

“We’ll just tell her we’re retiring,” Celestia said, dismissively. “What could go wrong?”