A day of being a living diaper, helpless to resist the will of your tormentor, has made you even more of a fatalist than you already were. And so, even though you have your human body back for the moment, you don't thrash or struggle as Celestia's magic levitates you alongside her.

The trip to Luna's bedchamber would be fairly long on foot; the two sisters occupy separate towers within Canterlot Castle. But the architecture features wide balconies in each tower, permitting Celestia to fly from one to the other quickly. You float beside her as she crosses the gap, trusting her magic to keep you safe as you pass through the dizzying heights. She lands on the balcony of Luna's tower, passes saluting guards, and walks through marble halls until she reaches the door to Luna's bedroom.

"Sister!" calls Celestia, knocking with her hoof on the ornate door. "I have a wonderful surprise for you this evening."

"Give me a moment," comes Luna's muffled voice. "If your surprise can wait until after the moon is raised, I would be ever grateful."

"My sister," says Celestia, smiling at you. "She is not a morning person." She pauses thoughtfully. "Nor the nocturnal equivalent of one." She turns back to the door and raises her voice. "Anon has come to visit us!" she says.

To your surprise, that seems to motivate Luna. You hear hasty hoofsteps on the opposite side of the door, and soon it opens, revealing the moon princess running a brush through the starlit void of her mane. "Anon," she says, dipping her head in your direction. Turning to Celestia, she says, "Has he been bad, sister?"

Celestia smirked. "He's been quite bad, Luna. Ever since he arrived in Equestria. But I think I've devised a way of getting through to him."

The magic that's holding you aloft glows brighter, and you experience the now-familiar feeling of becoming a diaper. Your body compresses and becomes soft - it's almost comforting, in a way, like being swaddled in warm cloth. Your body rotates, and your "eyes" are turned towards Luna. "Sister!" says Luna, her face lighting up with surprise and amusement, "I never thought you'd actually do it! I take it you've had some time with him?"

"All day," says Celestia. "We had great fun, and Anon learned a little something about himself. He loves being a big diaper full of delicious princess poop and thick royal cum. But you know how he is, Luna... he's so terribly contrary, I think he's going to try and convince himself he doesn't like it."

"Ah, I see," says Luna. "We need to immerse him in the experience. Fill him again and again until he cannot deny to himself that he loves to be a diaper. We will make him beg for it, sister dear."

"Oh, I would never be so cruel as to make him beg," says Celestia. With her magic, she moves you closer to Luna, and the moon princess picks you up with her blue aura.

"I would," says Luna. She levitates you to her backside and wraps you around her butt. The warmth of her furred skin is comforting; it feels right, somehow, to be wrapped around a pony's ass. Maybe that's due to a mind-affecting power of the transformation spell - or maybe you're just a pervert. One thing's for sure: Moonbutt is superior to Sunbutt. Bigger and thicker, just the way you like it.

"Well, I'll leave you two alone," says Celestia, yawning. "Be sure to create a mental link with Anon. It wouldn't have been half as fun if I couldn't listen to him complaining." You hear her walk down the hallway, and Luna turns away from the door, shutting it behind her.

"Sir Anon?" says Luna. "Please say something if you can hear me."

"Yeah," you say, though the link between your minds. "I'm here."

"I must apologize for my sister," says Luna. "She's being terribly unkind to you."

"Oh, thank fuck," you say, "I'm so glad you're not on board with this diaper shit."

"Pardon?" says Luna. "Oh, no, do not misunderstand me. I am very much 'on board.' I wish to apologize for my sister's equivocation. Her intention is not truly to teach you a lesson about yourself - or at least, that is not primarily her goal. She desires you, Sir Anon. You have captured her heart."

"Seriously?" you say. "Why?"

"You do not return her missives, Sir Anon. You insult her to her face, in front of her subjects. To a monarch so powerful and so loved, disrespect is a rare and heady spice. She wishes to have you... and to degrade and humiliate you as well."

"God damn it, I am not a tsundere!" You yell. "I'm just an asshole! Earth women understood that."

"Or perhaps we see something that they do not," says Luna.

"No, I mean it!" you say. "I think... I was never very good at making other people happy. And I started to base my whole personality around making other people angry, which made me easy prey for-"

"For fuck's sake, Anon," mutters Luna, "I did not inquire after thy life's narrative." You feel movement inside you - Luna's fat blue cock, formerly sheathed, is beginning to emerge. Like her sister, she's packing an enormous horse dong. "In any case, Sir Anon, I confess your disrespect tickles a corner of my heart as well... and the thought of filling you with my shit and my cum is terribly exciting." She strolls toward the east-facing window, pointing her ass - and you - in the opposite direction. "Now then, shall we raise the moon? I hope you are hungry for chocolate... and cream..."

Luna's back legs bend, and you feel her cheeks spread. Her asshole opens wide inside you, and the head of a thick turd touches your soft interior. You taste it right away - it's rich chocolate, with the same thick texture as Celestia's poop. Brownies. The first turd, thick as your wrist, slides out of her and settles inside you, bulging your diaper-body. At the same time, her cock creeps further and further out of her sheath, and you taste the musky flesh and the first salty drop of pre.

The brownies are incredible, maybe the best you've ever tasted. And you find that you don't mind the taste of her cock, either - there's something mouthwatering about the musky flavor of her arousal. You recall the surprisingly tasty mingling of Celestia's shit and cum, and you find yourself curious to see how Luna's salty cum and chocolate poop will taste together.

Oh fuck, you think to yourself. No, no no, I am not enjoying this! God, is it really this easy to start accepting that you're someone else's diaper?

"Oh my," says Luna, squeezing out another thick chocolate turd, "I'm sensing some conflicted emotions from you, Sir Anon." Her hips start to gyrate, and the flared head of her cock rubs rhythmically against your interior. "You have a princess' cock inside you, growing hard and close to cumming. You have the taste of her delicious chocolate shit on your tongue. You have every reason to be happy, sir Anon, and no reason to despair."

"Back on earth, no one ever tried to shit in me and tell me I should be grateful."

"I am sure your world has... mmmhh... many taboos around defecation," says Luna. Her second turd breaks off inside you, and a rumbling chocolate fart fills your senses. "But my poop is a sweet gift, Sir Anon. You must learn to accept kindness, no matter what form it takes." Her hips move faster, and her cock twitches inside you, spurting thin jets of precum into you.

"Including cum?"

"Most certainly including cum, my little human," says Luna, her body shuddering. "You must learn to love my cum as much as you love my shit... you must beg for my cum, you must worship my regal cock and my glorious asshole... hahh... You will be grateful and reverent, you shall be the royal diaper forever and ever, I shall fill you, and fill you, and fucking fill you with fat chocolate logs and thick salty cum-"

Her whole body jerks forward, and her dick shoots a splatter of cum into you. The thick fluid flows down, settling into the bottom of your diaper-body along with the coiled brownie logs. As you expected - and dreaded - the two tastes are surprisingly good together. Another jet of jizz hits you, then another, and the rest of her climax dribbles languidly into you as her body steps backwards on wobbly legs.

"Sir Anon..." she says, "You will be pleased to know... the moon is... raised."

"Yeah, awesome," you say. "You managed to do the thing you do every day. And which your sister managed to do while you were in jail for being a bitch."

"Oh yes," moaned Luna, "that's the fire I like to see." She backs herself into her bed and softly pushes her diaper against it, squishing her chocolate shit inside you. "Back before Equestria was tamed - before it was Equestria - my sister and encountered such spirited resistance in our quest to unite the nations of ponies. So many stallions we brought to heel, dominating them with our cocks and filling their mouths with fat logs of sugary shit. And when you curse me, dear human, I am reminded of how wonderful it feels to conquer a stallion with my poop."

"Go fuck yourself."

"Yes, yes, resist," Luna groans. "Making you beg to be my diaper will be all the sweeter."

"Ugh, fine then," you say. "How about this? Shit in me. Or don't. I don't care."

"Well, I am sorry to disappoint," says Luna, "But I have entirely emptied myself for the moment. Worry not - shortly after my morning repast my bowels will be mightily full and ready to feed you another load of chocolate logs."

Luna points her butt at her breakfast, and you give it a look. It's pretty similar to Celestia's - pancakes, toast, pastries - you get the sense that Luna has slightly different taste in fruit than her sister, but you're not all that interested. It's all going to be chocolate shit by the time it gets to you.

She does seem to love her coffee, though. A large carafe sits on the table as she takes her seat - squishing her poop inside you as she does so - and over the course of the meal she drinks all of it. "Ah, another fine brew," she says, after her first sip. "You know, a thousand years ago, coffee was difficult to come by. Of course we had no trouble getting our hooves on it, but the average pony would never taste it. And now it's everywhere."

"And after I drink this much coffee," she says, "I have to take the biggest dumps." You feel her ass clench and release inside you, and a long chocolate fart stirs your insides. "Ah, the prelude," she says. "Worry not, I shall share my breakfast shortly. You are light now, but I will make you heavy with my fat, fudgy turds."

"Time for the day's work to begin," says Luna, straightening her legs.

"We're just back in your bedroom," you say. "What is it you do again?"

"I tend to the realm of dreams, Sir Anon," says Luna. "And this night you shall accompany me." She spreads her wings and flaps them once, creating a sound that seems to shake the world - and then her bedroom falls away like a curtain, revealing a starry void. For a moment, you're stunned - but then Luna releases a crackling series of chocolate farts into you.

"Ooh," says Luna, "Your next meal is on its way, Sir Anon. I don't usually eat quite so much, but I want to fill you so big... to test the limits of your cute diaper body."

"Wait, so we're dreaming now?" you ask, looking over the swirling void. "We're both dreaming?"

Luna chuckles. "Ah, inquisitiveness - one of your few unsullied virtues, Sir Anon. I was trying to tease you, and your desire to understand was stronger than your indignation."

"Uh, thanks?"

"We are not asleep - rather, we are physically presentin the realm of dreams, Sir Anon. From here, we may visit the dreams of any pony who is sleeping. I tend to the dreamers, ensuring that their dreams are enriching and their sleep is restorative."

"Okay," you say, "So where are we going?"

"Where we are needed," says Luna.

"We?"

"I was employing the royal 'we,' Sir Anon. Many ponies require the aid of an alicorn princess. Very few, I should think, require the assistance of a living diaper filled with chocolate turds." She raises her head, and the tip of her horn glows blue. "It seems there are no emergencies at the moment, so we may tour the dreaming world at our leisure. I think one destination in particular would be especially fun..."

She abruptly breaks into a gallop, making your heavy diaper body bounce up and down on her ass. As she charges forward, one of the twinkling stars ahead of you begins to expand; you can see colors and shapes begin to form inside it, and it quickly becomes an image. And that image extends into three dimensions, becoming a space that Luna trots into.

You're in a circular room with wooden walls, wooden floors, wooden bookshelves - the whole thing seems to be carved out of a tree. You don't recognize the room, but you do see a familiar face - Twilight Sparkle, Princess of Friendship, is slumped on a pink couch. She's staring down at her crotch, where a foot-long horsecock protrudes, and she's using her magic to rub the flared tip.

"Ugh, I keep forgetting Twilight has a cock," you say.

"Your memory must be quite poor, then," says Luna. "Her stallionhood is by no means small."

"No," you say, "She usually uses a spell to hide it while I'm around."

"Ah, then she will be very pleased to hear how much you enjoy being full of cum," says Luna.

You let out a low, grumbling sigh. "So where are we?" you ask.

"You would not recognize it," says Luna. "It is Ponyville's library, destroyed and replaced before your arrival. Twilight has many memories here, and it lives on in her dreams." She trots over to Twilight, who doesn't react to her presence. "She will not see or hear us until I permit it," says Luna. "It seems she is pleasuring herself... shall we give her something to pleasure herself to?"

She points her butt - and therefore you - at Twilight, and Twilight finally notices you. But she doesn't seem surprised; instead, she looks at you as if you've been there the whole time. "Hey, Anon," she says, "You're looking really handsome today."

You start to say something - but before you can speak, you hear your own voice speaking words that aren't your own. "Thanks," it says. "You look good too. You've got a really cool dick."

"A really cool dick?" That's not how you talk. "Hey, Luna," you say, "Are you making me say stuff in her dream?"

"No, her subconscious is still in control," says Luna. "While she hides her penis from you in the waking world, it seems that she longs for you to accept it." Luna might not be controlling the dream, but she's clearly enjoying it; her cock is stiffening inside you, distending your crinkly body as it grows.

"Thanks, Anon," says Twilight. "I'm glad you like my dick. So how do you like being on Princess Luna's butt?"

"It's so good," says your voice. "I love getting filled with her big chocolate turds. She took a big dump in me already, and I hope she poops in me again soon..."

"Ooh, I'd like to see that," says Twilight. "You look so big and squishy and full of chocolate poop... Can I rub my dick all over you?"

"Of course you can, Twilight," says your voice. "I want to feel your big purple cock squishing around my poopy diaper body." Luna, only too happy to play along, lowers her butt onto Twilight's lap. Her stiff cock sinks into your mushy backside, and she begins to thrust her hips, humping your diaper body.

"You're so soft..." breathes Twilight. "So full of poop..." As she humps your backside, you feel Luna's body moving inside you: her guts are shifting, her cheeks are spreading... she's pushing out the first turd of her next big load of chocolate shit. And Luna is moving her hips back and forth, rubbing her cock against the hot, lumpy mass of brownies she's already dropped in you.

As a helpless diaper, heavy with shit, you're pinned between two princesses and their perverse lust. You can feel their thick horsecocks sliding against your body - Twilight outside of you, Luna inside - and Luna is pushing another hot fudgey dump into you. The first chocolate log is almost as long and fat as her cock, and you feel your body slump lower as its weight settles into you. Luna grunts, pushing two more heavy logs into you, seemingly in a hurry to make you as big and heavy as possible.

"Oh, Anon," Twilight groans, "You're so big and squishy and poopy... you're so warm on my cock... I wanna fuck your messy diaper body and blow my load all over you..."

"Cover me in your hot cum," says your voice. "I want to be a big poopy diaper for you... I want to be fat and heavy which chocolate shit..."

It's pretty upsetting that Twilight's dream is speaking on your behalf. But it's even more upsetting that the things it's saying in your voice are kind of true. And on top of that... hearing yourself say them makes them all the more convincing. As a diaper, it feels good when a pony uses you - and the heavier you get, the better it feels. And Twilight's cock is squishing around the chocolate mess inside you, turning that pleasure into rising tension. As a living, magical diaper, you're somehow capable of orgasm... and you can feel it approaching.

But Luna beats you to it. Her cock jerks, and a gush of thick, salty alicorn cum splatters against your insides, mingling with the enormous load of chocolate poop you already contain. You're unsettlingly accustomed to the taste of pony spunk now; you're really starting to appreciate the way it complements the rich, sweet taste of Luna's poop.

"I'm gonna cum," hisses Twilight. "Anon, I'm gonna cum all over you... you big, sexy, shit-filled diaper..."

Her cock twitches as it starts to pump her load... And you climax at the same time, waves of pleasure shooting through your crinkly diaper body.

And then, without warning, your perspective shifts. You're disoriented, your vision mostly obscured... but you can feel a weight bearing down on you, squishing around the thick brownie mess inside your bloated body. Twilight's moans are coming from above you now, and the cock inside you shoots a spurt of cum that tastes subtly different...

Twilight is wearing you now, you realize. The as far as you can tell, no one cast a spell; this is just dream-logic shit. Twilight is wearing you, cumming in you... and now you start to feel another familiar sensation: her cheeks are spreading as her asshole opens up. "Anon!" Twilight gasps, "I'm gonna shit... I'm gonna fill you with my poop..."

Twilight pushes a fat log of foodscat into you, bloating you with even more mess. The feeling of being filled gives your orgasm a second wind, and your voice shouts out, "Yes, poop in me, Twilight! I want to be full of your yummy shit!"

You're honestly not sure whether you really said that, or if it was the dream voice that's been speaking for you.

Twilight's shit is firmer than either of the royal sisters'. It takes you a moment to realize that she's shitting entire candy bars into you - long, king-size bars of chocolate that break into pieces as they hit the material of your diaper body, exposing the flavors within. There's caramel in there, and a dry cookie with what might be hazelnut flavor. It's exquisite, like some kind of high-end, artisinal Twix. And it goes wonderfully with Twilight's thick, salty cum. The first one is gigantic, almost a foot long, and the next few descend gradually in size.

Twilight sighs happily as her cock shoots its last little spurt and her butthole drops one final fun-size bar into you. You're huge now, enormously bloated with desserts delivered straight from Luna and Twilight's royal assholes. Twilight wiggles her hips inside you, squishing and spreading the mess underneath her.

"Anon," she says, "I can't believe I came so hard... and pooped so much... I... I think I'm in love with you, Anon."

Before you can react, the room vanishes, and you're back in the starry void of the dream world with Luna. "Best not to overstay our welcome," says Luna - who, you now realize, is wearing you again. "If you wish to have a heart-to-heart with Princess Twilight, you may do it in the real world. For now, I think it is safe to say we have successfully 'incepted' a desire to use you as a diaper."

The dream world fades, and you find yourself in Luna's bedroom again. "I shall return you to your human form, Anon," she says, magically gripping the tabs of your diaper body. "It seems you have quite literally had your fill - and it is difficult to move with your shit-filled body dangling down to my knees. Princess Twilight's addition to it is quite heavy..."

"Wait," you say, as Luna levitates you off her body and tapes you up, "Twilight's shit is still inside me? Even though we were in a dream when it happened? Does that mean you-"

That line of thought is interrupted by a much more important realization. "Wait a minute!" you shout. "I recognize those candy bars! Twilight's always offering them to me when I come over... and oh fuck, she always watches me eat them with that intense expression on her face! And... and that one time I told her I was really craving one of those candy bars, and she started breathing really heavy and sweating... God damn it!"

Luna bursts into laughter - and her telekinesis falters, dropping your squishy, shit-filled body to the floor with a splortch.