Today, you the human just met Princess Celestia and Princess Luna, they were bigger and more beautiful than you imagined. Tall, thick, and meaty their butts were, Princess Twilight Sparkle’s ass was bony thin in comparison to these two mares.
After a pleasant dinner, and a very… long… and boring conversation about politics with the nobles of Equestria at the dinner table. You had no idea about the politics of Equestria, so you said a mix of no and yes to their questions. For all you knew was these big ponies had big butts and you wanted to fap to them.
Eventually, you got so bored, that you said you needed to go to bed, but in reality you just wanted to masturbate before going to sleep. In one of the guest bedrooms of the castle you had fallen asleep after beating your meat.
Unlike the world you came from, you entered some sort of dream world here. Here, you were dressed in merely a pair of white underpants as you floated in a lavender night sky.
You didn’t really like the night sky so with a flash you changed the scenery. You now found yourself naked on a red love heart shaped bed between the big sexy ponies of Princess Celestia and Princess Luna, Celestia on the right, Luna on the left.
“Hello there handsome.” said Princess Celestia in a hot breathy voice, looking down at you with bedroom eyes.
“Our rumps are not big enough for him!” bellowed Luna.
With the sound of inflating balloons, the two ponies around you began to grow larger, their rumps cartoonishly growing in size. Up and up they rose, growing much larger than their real life counterparts.There became less and less space on the bed, as the fat cheeks of their butts continued to bloat outward.
The warm and soft flesh of their cheeks pressed against you like soft dough, making you shudder in bliss.
Mad with excitement you jumped out between the two huge cheeks to stand upon the bed. From there you turned around quickly to meet the two princesses, now the size of african elephants, with disproportionately large, plump backsides.
A big smile was on your face, said smile vanished to a look of horror when a door opened behind you, followed by the real Princess Luna walking in, who was the size of a shire horse.
“Ahhhh! What were thee dreaming about?!” she shouted, you dismissed the dream versions of the two into a puff of purple smoke, but it was too late.
“What did it look like?” you shouted, raising your arms high in exasperation.
“Why were you dreaming about Us and Our sister!” she shouted, pointing her hoof at you.
“This is my dream! Is it against the law to dream about princesses?”
“Well…. no… but it’s rude Anon.”
You looked down sadly. “Luna, I’m just a weird ass ape in this horse world, I could never, in a million years mount your ass and your sister’s ass.”
Luna walked forward, making to sit herself down next to you, the weight of her heavy backside deeply depressing the mattress beneath her.
“That’s not true, We and Our sister are total whorses.”
“.... what? You joking, right?” you said, looking up at her in confusion.
“It’s true, We have done the horizontal monster mash with millions over the years.”
“I...I… so... I can have sex with you?” came your voice, low and weak.
“Yes. Now, let Us see thy junk.”
You opened your eyes to find Princess Luna lying next to you. You lay upon a pink love heart shaped bed.
With a gentle tug of her magic, she pulled down your underpants to reveal your manhood. A most disappointed frown appeared on her face at the sight of it.
“Why is it so small?” she asked curiously, tilting her head to the side.
With that, you buried your face into your hands and began to cry. Through your grief, you felt her wrap one hoof around you, from there she pulled you to her chest, and began to gently nuzzle your neck.
“There, there, Anon, don’t cry. We shall still have pity sex with thee regardless. We shall enjoy the emotional experience of bonding with thee, even if thy phallus is so small and insignificant.”
This made you only cry even louder.
“Why can’t you just make my penis bigger with magic?” you said in a low voice.
She sighed deeply. “We tried that on the last human in Equestria. Unfortunately, it ended up causing the blood flow to leave his brain, thus killing him. So we, won’t be trying that again.”
“Oh, damn.”
“Since you're so inadequate, We might as well make thee even more inadequate.” she said in a nasty tone.
“What?! No!” you shouted in panic, jumping off the bed, landing on the hard marble floor with your two bare feet. “My penis is small enough as it is!”
Luna merely laughed maniacally, powering up her horn with an azure glow, before her body began to grow, rapidly. Her body became bigger and bigger, fatter and fatter, heavier and heavier, taller and taller, wider and wider. She put a particular strong emphasis on expanding her rump, her cheeks bloated out to be vastly disproportionate to the rest of her body.
You could not help but get hard, your mouth becoming watery at the sight of her fat delicious cheeks, only becoming more and more plump by the second.
Luna's swelling body rapidly began to take up any remaining space on the bed. As she grew larger, the bed began to creak and groan from her increasing weight.
Soon, the supports of the bed beneath her snapped like matchsticks. You took a few steps backward as her rump began to swell towards you, her bulk rapidly filling the room. At this point Luna was the size of an african elephant.
“Uhhhhh, Luna. Don’t you think you’re a little too big?”
Luna growled angrily, and with the force of a flash flood, her rump exploded in size, you thus were slammed against the far wall, with her mighty fat rump pressing you against it. Nonetheless, you did not feel the pain of the hard impact. You were now pressed against the cold stone wall by a squishy soft and warm rump, your rock hard member was pressed against her massive, moon cutie mark.
“Don’t ever say too big again, or We shall grow even bigger.” she boomed.
You gulped in fear.
“Now, get to praising our massive, glorious rump with thy tiny, inferior penis."
“Ye ma'am.” you said in a fearful, low voice.
With that, you worshiped the Moonbutt with your tiny, inferior penis.
End
