Princess Celestia's Living Toilet (Scat)

Your hind hooves hurt as they scrape against the floor, while your meek body is being dragged towards another one of Celestia's rooms.

The two familiar guards, that you would be inclined to believe Celestia had hired specifically just to move you around the palace, as it is clearly the exact same mares that brought you to court in the first place, are trotting much faster than the first time they did this with you. Probably due to your body being even lighter now than it was back then.

Yet, the time it takes to get there seems infinite. The thoughts in your head are swirling. Celestia's letter has gotten to you, and the fear of seeing your wife possibly being in your position has you more stressed than the knowledge that you, yourself was about to be tortured by the princess.

Celestia had been vague enough to keep you hoping that her replacement toilet was somepony else, even though you felt somewhat bad for wishing such nasty torment on strangers.

The tension was killing you. You wanted your time being dragged to last forever, so you would never have to find out the truth, but at the same time, you couldn't wait a moment longer.

Eventually, the dragging comes to a halt, and you assume that you've arrived at your destination, though you are too weak to lift up your head and see for yourself. The mare-guards drop you, and let your ragdoll body fall to the ground. Listening to the creaking of a large door being pushed open confirms it.

The guards, slide your body inside by throwing you across the ground, before leaving, letting you lie immobile in this smaller than usual suite, while listening to the heavy foofsteps of Princess Celestia slowly approaching.

In addition to hoofsteps, you hear the sounds of spluttering, screams and cries coming from the room next to you. It makes your stomach turn.

Suddenly, you feel your body being levitated with magic, as your owner picks you off of the ground, and turns your head so you can look at her. She's smiling, happy as can be, while you continue to hear the sounds of torture in the room next to you.

You can't make out much from their cries, but you can't help but imagine your wife getting racked while Luna goes potty in her mouth.

Your train of terrifying thoughts is broken as the Princess talks to you.

"My goodness, you've gotten so small."

She spins your body around mid-air, to get a better look at you.

"You're like a pet, now." - She laughs.

She then puts you down, and with magic, she lifts your hind hoof up and makes you scratch your ear with it like a dog.

"Make pet sounds." - She commands, giggling like a filly.

With your meek, underpowered throat, you barely manage to utter a simple woof, to please the princess, and it comes out sounding more like a death rattle.

Celestia stops giggling, looking down at your broken body with disgust in her eyes.

You think you're about to be tortured for your inability to make proper 'pet sounds' for her, but much to your surprise, all she does is push you over with a hoof, and tell you that you're a terrible pet. Then, she turns around and simply walks away from you, leaving you to lie on the cold floor and listen to the continues sounds of somepony being horribly mistreated in the next room. It's clear to you that they are not just screaming in disgust, there are clearly some much more conventional torture methods going on, and the thought of your wife possibly being the victims still haunts you. You had expected to find out the moment you entered the room, but Celestia had opted to leave her toy lying around on the ground where it could only imagine the worst.

Eventually, the sounds of forced suffering stops, and a hidden door in the wall opens up. Somepony, by the sounds of it, large in stature trots into the suite, you can't muster the strength to turn your head and see for yourself, but you assume it's Luna, taking a break from the torturing.

Your theory is confirmed as the Princess of the Night picks you up like her sister before her.

"Hey, if it isn't my old Diarrhea-Drinker. Didn't know you were still alive. You certainly don't look well, though. I thought you were malnourished before, but you're all skin and bones now."

The look she gives you seems almost concerned. She looks over her shoulder, before speaking to you again in a much lower voice.

"Eh, listen, you've eaten a whole lot of shit, and you've been quite good at it too. Far better than your average toilet slave, I'd say."

She looks over her shoulder again, scouting nervously for her sister.

"Maybe you deserve something non-fecal to consume... Just this once..." - She whispers, leaning in close to your face.

"I'm taking a torture break, and I'm making smoothies. I'll give you a choice here, do you want smoothie, or do you wish to stay loyal to my sister and only consume her waste like she intends?"

The thought of tasting something that has yet to be processed by a stinky princess belly, makes you light up with glee and utter a sound of thankful agreement, to which she smiles at you, kindly.

"Smoothie it is, then."

You're half expecting her to bring you a glass of her liquid, lumpy feces, and just tauntingly call it a smoothie, but you're pleasantly surprised when a few minutes later, you're reintroduced to an almost forgotten scent of blueberry and banana.

"Told you I wasn't as sadistic as my sister." Says Luna, covered in sweat from her recent efforts at torture.

The pleasant scent lets you take your mind off of your wife's potential suffering for a moment.

With a flash of light, you're teleported to Luna's own suite. Luna sits down in her bed, with her back against the wall, before levitating your body over to her bed as well. She spreads her legs, and you instinctively prepare to have your snout shoved into her musky cunt, but instead, she places you in a sitting position, in between her legs, your back against her warm body. A blanket appears, and wraps itself around you, quite contrary to how it usually goes when you're wrapped in a blanket alongside a princess, it's your body and not your face, that gets covered this time, indicating that you're not here to huff up Luna's farts, you're here to drink smoothie with her.

She levitates the glass up to your muzzle, and places a straw in it for you to suck through and so, you're inclined to taste the lovely substance. As you take your first sip of banana/blueberry smoothie, sitting in the princess' warm, soft embrace, wrapped in a blanket, and she turns on the TV, for the first time since you got here, you're genuinely not suffering.