After spending what she could only guess was a full month with Fluttershy, Rainbow rolled out of the bed in her cottage, gently dislodging herself from Fluttershy’s hooves, and flew out the window. Flutters knew she’d be back. Rainbow knew where to get more potion to keep her futa-dick going strong. Twilight’s castle. Flying in the window of Twilight’s library, she saw her friend hard at work at the desk. She’d subtly implanted the thought in Twilight’s mind to constantly keep a stock of the potion on hoof. Landing quietly behind Twilight, Rainbow reached under the desk, between Twilight’s legs, and slipped a vial of the potion away.

Slipping out of the window, Dash downed the potion, flying by Twilight’s mailbox to drop the vial inside, before taking off for Canterlot by wing. The train wouldn’t take her to Canterlot this late, so she had to get there by her own power. She could see the night guards walking the walls, their keen eyes always vigilant. But the one weakness of guards everywhere was direction. Guards never look up. Flying over their heads was easy. Even if they were bat ponies and accustomed to the dark, getting past them without being spotted had always been easy. First stop, the library.

Twilight, under passion filled delirium, had informed Rainbow that Luna spent the first half of her evenings in the library, her horn aglow to keep ponies from having bad dreams. Flying in the top floor window of the library, Rainbow landed silently on a book shelf near the center. Looking around, she didn’t see the tell-tale glow of Luna’s flameless torches, or her magic. Did she already leave? Hearing the door open, Rainbow looked over and ducked down, making herself harder to spot. Luna was just arriving. Perfect.

Not so perfect were the two guards that stood in the doorway. “Thank you,” Luna said, turning to the guards. “I will call for you when I am ready to return to my room for the night.” She said and the guards saluted, turned and walked out the door. Perfect again. Watching Luna from her perch, Rainbow barely suppressed a grin as she ventured deeper into the library, further from the door.

When she finally stopped, Rainbow watched her pick out a book and blushed. “Modern Equestrian Mating Practices.” She read from Luna’s mind. “Why would she want to read that?” she asked herself. Shaking her head rapidly, she flew down and landed lightly behind Luna. “You didn’t hear anything behind you, but that chair is uncomfortable. You want to stand, keeping our rear in the air and your tail out of the way.” She thought into Luna. A moment’s hesitation and Dash thought the potion didn’t work anymore, only for Luna to stand up, move the chair out of the way and flip her tail over her rump. Dash smiled as she took in the perfect rump in front of her.

Fluttershy was amazing. Everything about her was perfect, even the slight flaws like the bunny bite mark on her shoulder from Angel, the multiple peck marks from birds and other beaked creatures, and the small scar on her right rump from when she’d accidentally sat on a porcupine that had panicked and run, ripping its quill out of her rump. Princess Luna was absolutely perfect. Not a scar on her. Her rump was perfectly rounded, her cheeks angling perfectly into a pussy that barely winked. Even her teats were perfectly proportioned. Not too big, not too small.

Flying up just a little, since Luna was just a tad taller than she was, Rainbow angled herself for entry and... plunged in. Luna jerked just a little as Rainbow’s shaft sank home, slipping into the Lunar Princess all the way to the base, her medial ring barely meeting with any resistance. Rainbow chalked that up to Luna being hundreds of moons old and clearly having experience with this sort of thing. No-pony could remain a virgin for that long. Pistoning in and out of Luna, Rainbow felt the princess clench around her, holding her tight. Instinct? Not letting it bother her, Rainbow continued fucking the Princess of the Night.

It was over quicker than Rainbow would have liked. With a jerk and a spasm, she blew her load in Luna’s mare cunt, filling her with as much seed as she could. Panting, spent, she fell to the floor, her cock coming free of Luna’s royal pussy. “Is that all?” A voice asked over her head and Rainbow looked up. Her breath caught in her throat as she stared up at the, almost bored, face of Princess Luna. Looking towards her rear hooves, Luna was standing there still, her cunt dripping with Pegasus spunk.

“But... I don’t... I didn’t... how did...?”

“You are asleep, Rainbow Dash. I must admit, this is a rather interesting dream.” Princess Luna said and Rainbow sighed.

“So is this all a dream? Just one huge dream?” She asked and Luna shook her head.

“Mm, no. But as of your... escapades with Fluttershy, we have taken some precautions.”

“We as in you... or...”

“We as in my sister and I.” Luna said and Rainbow swallowed.

“So... are you still a dream...?” she asked and Luna shook her head.

“No. I am quite real. And quite pleased that you would chose to come to me first, rather than my sister.” She said and Rainbow smiled a little. “So pleased, in fact...” she started and Rainbow’s ears dropped as Luna walked around her. “That I feel I should give you a reward. Do not move if you please.” She said and Rainbow’s eyes widened as Luna got down on her knees, her magic rubbing Rainbow’s cock back into hardness, before the Princess’s mouth, the real princess’s mouth, engulfed her cock.

This Luna felt different. Her throat was wider, her muzzle slightly longer. Looking down at her, Rainbow’s ears went back again. Nightmare Moon stared up at her, her mouth wrapped around the futa-mare’s cock. Pulling back, she rubbed Rainbow’s cock with a hoof. “Does this visage frighten you? I thought perhaps you would find it... therapeutic... to ravage the mare who frightened you so in the past.” Nightmare Moon said and Rainbow blinked. It wasn’t Nightmare Moon. It was still Luna. In the form of Nightmare Moon.

“But... why would...” she froze as Nightmare Moon/Luna engulfed her cock again, her throat bulging with the shape. She couldn’t ask any further questions as he mare rotated herself around, positioning herself over Rainbow’s head, her cunt already glistening in anticipation.

“Do us a favor, Rainbow Dash, and put your mouth to better use than asking stupid questions.” Nightmare Luna said and Dash started to respond only to get a muzzle full of Royal pussy. Unable to do anything but lick and suck, she did just that and the princess did the same. She was sure Luna’s back was arched painfully, considering just how much shorter Rainbow was than Nightmare Moon, so rather than just continue at the current pace, she reached up, grabbed Nightmare Moon’s rump, and plunged her muzzle into the mare’s sopping cunt. Nightmare spasmed around Rainbow’s muzzle, orgasming hard, the results having Rainbow herself orgasm into Nightmare’s mouth.

Rolling off of her, Nightmare Moon vanished, replaced with Luna again, who was panting heavily, her muzzle slightly leaking some of Rainbow’s cum. “So... would you mind... explaining that...?” Rainbow asked, pointing with a hoof at the mare still quivering over the book.

“Ah, of course. Aura, you may cease your disguise now.” Luna said and suddenly the other Luna vanished, replaced with a unicorn mare with a bright blue coat and a silvery white mane and tail, her cunt dripping with Rainbow’s seed. “You did wonderfully. I will be sure to reward you later.” Luna said and the mare smiled before she collapsed, her legs no longer able to hold her up.

“Is she... alright?”

“She will be. Aura is my body double for... I believe our friend Rarity would call them uncouth situations. Her particular magical ability allows her to take on the physical form of another.” Luna said, wiping a drop of Rainbow’s cum off of her lip.

“Does Celestia have one?”

“She has several. One for diplomatic meetings, one like Aura, one for... other circumstances...”

“I think I understand.” Rainbow said and Luna nodded. “Um, one more question...” Luna nodded for her to continue. “How often does Celestia... um...”

“Take a good dicking?” Luna asked and Rainbow gaped at her. “I have heard many things in the dreams of our subjects. The answer to your question is, not often enough to satisfy her. I believe her last rutting was... ten years ago.”

“Ten y... and she’s not constantly dripping, waiting for one of her guards to bend her over?”

“I believe she relieves herself in her dreams. I dare not intrude after one dream I caught her in.” Luna said, shivering slightly.

“Wow... I should tell...”

“No, you should not tell Twilight Sparkle. She would take it upon herself to help relieve Celestia, and my sister would never look at her student the same way again.” Luna said and Rainbow nodded. “So, as we are no longer in a dream, I will give you two options, Rainbow Dash. You can leave and go home for the night, be with dear Fluttershy until morning, when you come for my sister.” She said and Rainbow looked at the window then back at her.

“Or?”

“Or you can remain here, I send these two away to be replaced with two of my mare guards, and you get to have all of us until morning.” She said and Rainbow jerked, her cock reacting before her mouth could. “I see your friend likes that proposal. What say you Rainbow Dash?”

“Um... I say...”

Rainbow snapped awake in Luna’s bed, Princess Luna seated by her head, a guard’s hooves visible under the Princess’s chest, the bat-pony mare’s head clearly buried in Luna’s snatch, another bat-pony mare swallowing Rainbow’s cock. Rainbow’s eyes squeezed closed as she released in the mare’s throat, every drop disappearing down her expert gullet. Luna smiled as her own hips shuddered with her orgasm. “When did...”

“You passed out. I think all of the blood rushed to your cock at my suggestion.” Luna said and Rainbow stared up at her as the guard sucked her way off of Rainbow’s cock, her head coming free with a pop.

“Princess, she is prepared. May I?” the guard asked and Luna nodded. Rainbow’s eyes snapped open and she looked down at the guard, who positioned herself almost blindly, her hooves not touching the ground as her wings beat slowly, before her wings stopped and she dropped. Every ounce of her sank Rainbow’s cock completely inside the mare, both of them moaning in ecstasy as Rainbow immediately came inside the bat pony guard. That seemed to be all it took for Luna, as with a shudder, she and her own attendant came, the guard’s ejaculate soaking the bed below her hips.

“Oh... my... Moon... she is amazing... Princess.” The guard said, rocking her hips into Rainbow’s, the Pegasus mare’s cock still hard inside her even after the orgasm. Rainbow moaned as the guard went to work on her and Luna smiled, lifting her hips slightly so the other guard, the spitting image of the one impaling her on Rainbow’s cock, could see. Twins? How in Tartarus did Luna get lucky enough to score twin bat pony mares? Rainbow’s thought train derailed as with a swift movement, the other twin rotated, half of her body still under Luna, while her lips went to work sucking and licking every inch of Pegasus cock her sister’s pussy didn’t engulf.

Rainbow watched as, even though her tongue touched her sister’s clit often enough, neither mare stopped, Luna rotating around and toying with the other sister’s slit. “How much longer can you hold on Rainbow Dash?” Luna asked and Rainbow couldn’t even answer. Her eyes rolled back into her head, she twitched and both guards moved around her, opening their mouths and rubbing her cock slowly. With a low moan, Rainbow came, covering the two mare’s faces in her cum. When she’d stopped twitching, she looked at the two and froze as all of the blood rushed from her head to her cock.

The twins were making out, rubbing their bodies together to rub in as much of Rainbow’s spunk as they could. Luna smiled at them and glanced at Rainbow before bursting out laughing. “It seems, my lovelies, that you display has had quite the effect on Rainbow Dash.” She said and the two mares looked over and smiled before snuggling up on both sides of Rainbow, their own cum covered coats slicking hers with cum.

“Might we remain here for the night, princess?” the one nearest her asked and Luna looked at her twin sister. Luma and Lima. She could tell the two of them apart by their eyes. Luma’s left eye was silver while her right eye was the turquoise of the bat ponies. Lima’s eyes were the exact mirror opposites. Seeing both silver eyes looking up at her, Luna smiled and leaned down, kissing Luma square on the lips and sharing in the delicious semen she’d collected. Lima squirmed, watching the display before her own lips where claimed by her princess.

“You may both remain here with Rainbow Dash. But remember, she is not ours to keep.” Luna said and the two mares nodded, snuggling in closer to their temporary partner.

Author's Note

Hm. Luna chapter. Felt like throwing in Bat Pony's. Also felt like twins, so we have Luma and Lima, the bat pony twins and personal body guards of Princess Luna. Hence why being around a naked Luna doesn't fluster them. Add two more to Rainbow's growing harem of mares, shall we? Next Chapter... Celestia. And boy is this one gonna be fun.