Luna Wants To Be On Top

Within a dimly lit room, you, a human lay upon a massive, lavender love heart shaped bed. You were simply dressed in white underpants. A large, dark blue alicorn known as Princess Luna lay next to you. Her huge bubble butt was quite a sight to behold. Her cheeks were so wide you would be barely even able to hold both her cutie marks from behind her.

“Make love to us, our little handsome ape,” she spoke in a soft voice.

“Yes, my sweet big moon princess!” you exclaimed excitedly.

With that, you pulled your underpants down, followed by throwing them across the room into yonder wall. You then proceeded to walk around the prone mare, positioning yourself behind her glorious moonbutt.

“Stop!” she exclaimed, raising a hoof. “We wish for thee to go under us, so we can mount thee and slam our massive mighty buttocks upon thee!” she commanded.

“Uhh… Luna. I’m not sure if that’s going to work,” you said, your voice low and nervous.

“How so?” she inquired curiously, perking her ears.

“Umm… you’re… too big.”

“Are thee calling us fat?!” she said in a quiet voice, laced with venom.

“No! It’s just that my body is far weaker compared to yours. Your sheer weight will break my pelvis.”

“Thou are calling us fat! How dare thee?!” she shouted, standing up onto her four hooves to give you a most hateful glare.

“Luna, don’t you understand? Your ass will break my pelvis. You’re just too big,” you exclaimed.

“What about all the exercise thou has gotten mounting our backside from behind? That surely has made thee strong enough to withstand our butttocks? How does thou know our butt won’t break thine pelvis?”

“Luna please, you will most certainly break my pelvis!” you shouted.

“Even if we did break thine pelvis! We can easily heal it with magic!” she protested.

“I’m not willing to endure that pain,” you spoke firmly.

Luna lowered her head, tears falling down her cheeks, speaking in a low voice. “We…. we understand. The pain would override the pleasure from our massive behind mounting thine weak and small body.”

You could not stand to see her cry, thus you gently placed a hand upon her cheek and spoke in a soft voice. “You could always be on top in the dream world.”

Luna gasped in joy, before wrapping her hooves around your body to….to... ‘hug’ you with a bone crushing embrace with her super alicorn strength. This caused you to scream bloody murder in pain as your bones cracked sickeningly from her tremendous strength.

“Aaaaaahhhhhhhhhhh!” you screamed in agony!

Thankfully, she soon acted quickly to relieve the pain and fix your bones with a flick of her magic from her horn.

“We… we are most sorry about that,” came her voice, low and soft.

“It’s Okay, Luna. You sometimes forget your own strength,” you spoke in a low, raspy voice.

“And our weight,” she added somberly.

“Hey, I love meat on my mare. I don’t want a bony thin mare. I like big butts and I cannot lie.” you said sensually, reaching an arm around to place it upon her right buttcheek, sinking your fingers into the thick layers of squishy soft fat.

Luna made a happy sound like a dog’s chew toy, before she roughly pushed you onto your back. You were about to voice your protest, but your words died in your throat when she merely lay herself down next to you.

“Let us sleep so we can slam our massive buttocks upon thee without causing pain nor breaking thine pelvis!” she boomed in her powerful voice.

“Okay, you big crazy horse.” you said softly, leaning toward her.

The both of you exchanged a brief, gentle kiss before closing your eyes to drift off to sleep minutes later.

You opened… your eyes… in the dream world to find yourself lying upon a very squishy soft ground, your body sinking deeply into it. You sat up to survey your environment to see nothing but a sea of dark blue that went on seemingly forever and ever. Above you stood space, it’s stars twinkling beautifully.

“Um Luna, where are you?” you inquired.

“Why, you are on our butt, my little human.” she said in a mocking tone.

“I’m… on your butt?” you said in a most bewildered tone.

You pressed your hand down upon the ‘ground’ only for you to feel a very thin line of soft fur, with squishy soft fat beneath it. Your applied pressure made your hand sink deep into the mass of soft thickness below.

“Yes. Our butt is far too small in the waking world. Here, our butt even surpasses our sister’s butt in size.”

“How big is your butt?” you said, low and nervous.

“Two million and five hundred thousand light years in width and height. Impressive, is it not?”

“Eh, could be bigger,” you said, not sounding very impressed.

“You’re right. Our butt is still far too small! So bony thin.”

A magical mirror appeared before you, granting you the magnificent sight of Luna’s astronomical sized butt in all her glory by a view from afar.

You saw a galaxy being pulled toward her super-massive, black hole of an asshole. Her butthole devoured the galaxy, its matter being converted into fat to add to the glory of her ass.

Your cock twitched hard, loving the sight of her butt thickening out by a few billion light years.

Luna giggled, before she repeatedly sent galaxy after galaxy straight into her asshole, each one ballooning her ass out even further across time and space.

Her growing ass was quite a sight to behold. This naturally made you become as hard as a diamond. Your hand slipped down to your cock to hold it firmly. From there you jerked your hand up and down your cock, loving the sight of Luna’s growing butt.

Luna made a loud neigh in excitement, loving the sight of you masturbating to her butt. So, with that she grabbed entire clusters of galaxies, before sending them hurtling into her ass all at once, growing her ass to make it more visually pleasing for you.

With that her butt exploded in size, expanding quadrillions of light years across the universe per second, growing faster and faster as galaxy after galaxy was swallowed into her butt. The speed her ass was expanding was so great, entire megaclusters of galaxies were being swallowed up by her butt alone bumping against them as it grew in size.

Luna gave a sad sigh when the last of the universe's stars and mass were swallowed up by her butt. You and Luna’s giant butt were the only things left in the universe.

“Is our butt big enough now?” she asked in a joking a manner.

“Meh, I think it could be bigger.”

“Oh don’t be ridiculous. My butt is big enough, I’m trying to go on a diet by not visiting the all you can eat forever multiverse buffet.”

A long, awkward silence ensued, neither of you saying a word. Eventually, you decided to break the ice. “Can I bounce on your ass?”

“Sure, go ahead my little ape,” she beamed happily.

With that, you stood onto your feet, before taking a jump. You went high into the air, before falling back down again. Like a compressed spring, your body sank deep into the thick layers of soft fat, before you were sent hurtling upward, the very same thing happening again when you came down.

Luna giggled happily, loving the sight of you smiling like an idiot as you bounced up and down her giant butt like a bouncy castle.

This went on for quite some time, until at one point during mid bounce there came a huge, dark blue mass, which tackled you to the ground, entrapping you in total darkness from under a butt that was so large it covered your entire body. The heavy mass of squishy soft flesh pressed you deep into the unending, soft thickness of Luna’s rump below. Though, in actuality you two were only pressing down a tiny amount of fat down her universe sized butt.

The weight of this ‘smaller’ Luna was so great you could not move an inch, the fat of her butt folded around your body like soft dough, smothering you under an immensely thick layer of fat belonging to her mighty alicorn butt. Somehow, you felt no pain and could still breathe from under her giant butt.

“Hmm, it seems thine phallus is so ill-equipped it can’t even reach our moon flag planter,” she spoke in a mocking tone.

You merely gave an angry mumble through the mass of fat covering your mouth.

“Too big of a butt?! That's heresy! Oh, just for that this small moon shall become bigger!”

Luna's horn flashed with blinding light. Her fleshy cheeks rippled like jello as she slowly expanded, her legs and whole body in general were also rapidly elongating.

You moaned in pure bliss into the mass of expanding fat above. At the feel of your tiny cock poking her backside, Luna's body only increased in expansion speed.

More and more mass, meat and fat added to her rump. Her butt was already the size of a small city.

‘I love you, Luna’ you tried to say through the mass of flesh from above you, but all that came out was an incomprehensible mumble.

“I love you too!” she boomed.

With that Luna’s butt violently expanded in size, rapidly stretching across the other super-massive rump she sat upon.

On and on, Luna's rump swelled in size by a faster and faster rate, overjoyed that you told her that you loved her.

A soft kiss from you upon her cheek only caused her rump to expand exponentially faster. Loud moans left the growing alicorn.

First her butt became the size of a galaxy. However with the help of another kiss upon her cheek it caused her rump to have a massive growth spurt, to make her butt the size of three galaxies.

The great speed of her growing butt increased even further, quadrupling in size by every passing second.

Luna's butt was still quite small compared to the other one she sat upon, but it was quickly catching up. Her ballooning cheeks rapidly spread across the vast surface of the other Luna's butt, the weight of her immensely heavy rump depressing the squishy soft fat, pushing your small form deep into the thick layers of soft, flabby flesh.

The cosmic giant mare cried out, when she felt you kiss her cheek yet again. Her rump felt honored by your praise, causing it to go through a series of massive growth spurts.

Every passing millisecond her rump quadrupled in size.

Soon enough, the ‘little’ Luna was halfway there in size. Soon, her rump shall be just as big and glorious as the butt she sat upon.

Powered by your love, Luna’s rump quickly rose to challenge the other. Within the space of mere minutes, her butt had finally grown to be just as big as the other, sandwiching you between two universe sized butts.

“Now, we shall summon a more modest sized, yet still big version of ourself to ride atop thee and--”

…. and then there came a loud buzzing sound, making both of you awake with a start.

“Die technological abomination! Thou has ruined our dream with our lover!” ” Luna roared, before blasting the buzzing alarm into dust next to the bed with a deadly beam of pure, dark blue energy.

The End