Twilight Sparkle stirred drowsily at the bottom of the musty pit. It  took her a moment, but after the shock of waking up in unfamiliar  surroundings, she remembered why she was here. Princess Celestia had  summoned her to Canterlot for a private lesson. Twilight, very much  attached to her mentor, of course could not turn down this opporunity.  Celestia lead her through a slim corrider which smelled of dust and  mildew and into the small room she now found herself in. The room was  obviously a sort of pit, but Twilight assumed it had been repurposed.  Celestia told her to wait patiently, and that there was a mattress on  the floor in case she wound up waiting long. Twilight never expected she  would be kept up that long, but the mattress came in handy when she  was.

While she was still overcoming her groggy state, she was  startled by a jarring clack from above. Above the semi-circular pit was a  grate which ended up in a dimly lit chamber that Twilight couldn’t make  out. Lost in a fog of excitement, Twilight had never bothered to wonder  why Celestia would leave her in the pit. She thought that maybe it was a  waiting room, or it was part of some special isolation training.

The  sound of hoofsteps reverberated down through the grate into the pit,  knocking dust around the walls, irritating Twilight’s sinuses. She  sneezed a few times, and was too distracted to notice the Princess was  now standing above her, staring down.

Twilight regained control  of herself and noticed the lighting had changed. The room had grown  darker. She looked up at Celestia’s grinning face.

“Princess!” She exclaimed. “I’ve waited for hours. Are you finally going to give me that private lesson?”

Celestia  grinned, but her eye twitched as she tried to maintain her smile.  “Y…yes, my faithful student. I…ugh…I wish to teach you one of the most  important lessons you will ever learn.”

“What is that princess?” Twilight asked.

“I want…oh go-…I want you to learn all about shame.” Celestia told her, wincing again.

Twilight tilted her head and screwed up her face. “Shame, princess? I don’t understand.”

Celestia  tapped her hooves against the grate nervously. “You will understand,  Twilight. Just…oh no…we’re beginning the lesson now.”

As Twilight  watched with concern, Celestia quickly spun herself around so that her  flank was place directly over the grate, giving Twilight a flawless view  of Celestia’s private parts. Twilight blushed and fixated her stare on  her own hooves.

“Uhm, princess? Is this a proper thing for royalty to be doing?” Twilight mumbled.

Celestia  did not answer. Instead, her reply came in the form of a powerful,  waterfall-like stream of urine, pouring down into the pit and soaking  Twilight’s coat. Twilight squealed both in shock and disgust as soon as  she realized she was being peed on.

“PRINCESS! What are you doing?!” Twilight screamed. She dared not look up, not wanting to get her face pissed on.

Celestia  left out a relieved-sounding groan. “I’m teaching you about shame,  Twilight, like I told you.” This sentence was punctuated by a short  grunt from Celestia.

By now the pee stream had receded to a  trickle, but Twilight was already saturated in Celestia’s foul,  lemon-tinted fluids. Twilight had to struggle with her body not to vomit  on the floor. As it was, she was choking back frequent dry-heaves.  In-between gags, she realized that above her, the princess was grunting  and groaning very loudly. She risked a glance skyward.

Through  the rusty, dripping bars overhead, Twilight could see that Celestia’s  ass was expanding and contracting in time with her grunts. Twilight  quivered in place with her eyes widened, the size of baseballs.

Celestia  let out an extremely loud whine and opened her asshole wide, a  tremendous turd appearing and smearing against her perfectly groomed  tail. Celestia hunched down on her back legs and placed her flank  against the grate. She continued shitting directly through the bars.

Twilight  threw herself at the door, desperately stomping at the thick wood,  trying to escape before she became Celestia’s personal toilet. It was  all in vain, however: Celestia had bolted the door behind her.

“Nngh.  I’m sorry I kept you waiting Twilight, but I had to eat quite a hearty  meal to build this up.” Celestia chuckled playfully. “I think it will be  worth the…mmmng…wait.”

Twilight threw herself on the ground and whimpered. “Why, princess?! What does this teach me about ANYTHING?!”

“Rrrnnn…sorry  Twilight, you’ll have to figure that out on your…oaaahhnn…own…here it  comeesssssss….” Celestia stamped her back hoof a few times.

Celestia’s  asshole domed wide open and a two foot log suddenly launched out like a  missle and smacked Twilight in the back of the head. Twilight couldn’t  take anymore and retched, spilling chunky yellow vom all over the  slippery floor. While she was puking, Twilight lost her footing and  slipped, sliding face-first into a puddle of piss and throw-up. As  Twilight began sobbing, Celestia let loose with a sloppy load of foul,  odorous diarrhea.

Celestia sighed with content as she finally  finished up. She stood back up and turned around, looking down into the  pit. Twilight was still shivering and crying. Celestia smiled tenderly.

“It’s  quite alright, Twilight. This is a hard lesson to learn, but you’re  doing well.” Celestia said. Twilight only whimpered in reply.

Celestia  trotted away. “We will begin your next lesson in a few hours, after  I’ve been cleaned up. See you later, my star pupil!” Twilight howeled,  shaking the walls of the pit, echoing through the entire structure and  sending a chill up even Celestia’s spine.

“She will learn soon enough.” Celestia thought.