Author's Note

Whew, this one is long overdue. Actually thought I had already published this last chapter months ago. Didn't realize I hadn't until the original requestor msged me. Sorry, and expect some other new stuff coming fairly soon.

The Third Lesson

“Um, Ms. Cheerilee?” A sheepish student called out from her desk in the Ponyville schoolhouse.

The young filly's left hoof waved desperately in the air above her head while the other leg was hidden from view. It was only from below that one could see her hoof gently sliding up and down through the moist folds of her pussy.

“Hmm?” The teacher hummed, turning away from the chalkboard. “Yes Sweet Flower? Did you need something~?” Cheerilee asked, her voice smooth and somewhat seductive.

“Could, um, c-could you t-turn a little bit more please? We can’t see very much on this side of the room.” The filly replied, her face burning brightly as she could practically feel her teacher’s eyes on her as they briefly glanced down beneath the desk.

Cheerilee chuckled at the filly’s flustered request, though she was quick to indulge her. Repositioning slightly, the grown mare now more directly faced the chalkboard, ensuring that the entire class would have an equally fruitful view of her plump flanks. Or, more importantly, the enourmous bulge hanging down from her panties.

“Is that any better for you all? Can you see my messy panties now?” Cheerilee asked, gently swaying her hips side-to-side and making the lumpy protrusion to sway.

“Y-yes Ms. Cheerilee!” The filly yelped, using both hooves to pleasure herself as a scarlet hue enveloped her entire face.

Sweet Flower’s gaze was now firmly locked to the bloated seat of Cheerilee’s underwear, though she certainly wasn’t the only one actively pleasuring herself to the enticing sight. Just about every other colt and filly in the room were performing similar erotic motions in more or less the same manner. Though a few were dedicated enough to also be taking notes on what was actually being taught, the two weren’t all that different anyway.

“So far everypony is doing a wonderful job~.” Cheerilee cooed. “Just make sure that you are all paying very close attention as you're following along with me. Remember, the key is to use slow but firm strokes at first. You’ll want to feel all that hot tingly pleasure building up for as long as possible, okay?” Cheerilee explained, turning her head back to resume drawing a few more ‘helpful' diagrams upon the board.

As she began to draw the broad head of a stallion’s pride and joy, the mare’s pussy winked, her clit tagging the dense pile of manure which had only just recently been pushed out into her panties. Suppressing a moan, she began to wonder how in Equestria she’d managed to get to this point.

It’d been almost four days since she soiled herself in front of the entire class for the first time, and almost every day since, she’d been doing her level best to accommodate for her students’ newfound favorite fetishes. It just so happened that their latest topic was perfectly aligned with this goal, with their current lesson covering the ever taboo subject of masturbation.

Granted, the version of the lesson plan that she was teaching them was a bit more... ‘vivid’ and ‘interactive’ than the one from their textbooks. Most notably, it critically failed to include the parts where she'd instruct the entire class to masturbate while she pooped and pissed herself. Still, Cheerilee was confident that her alternative way of teaching was pretty popular~.

Sitting beside the filly who’d raised her hoof earlier, a very happy colt panted quietly in his chair as he feverishly stroked his twitching member. Never in a million moons could he have ever imagined that one of the most boring parts of his day would so quickly become his utmost favorite. A little over a week ago he’d been desperately trying to fend off boredom by perving on Ms. Cheerilee’s, but now, there was barely any skirt left for him to look under. The clothing their teacher wore seemed to be getting shorter and skimpier with each passing day.

“Mnf~!” A small voice yelped on his left.

Tearing his eyes away from his teacher’s soiled underwear for a moment, the colt glanced over just in time to witness Sweet Flower's body tremble as an intense orgasm rocked her. Both forelegs remained tucked deep between her thighs, with a glistening layer of juices coating their ends. After a few whimpers of pleasure, the cute filly finally collapsed face-first onto her desk, a blissful smile spreading across her lips as she rode her orgasm for all it was worth.

“My, my~” Mrs. Cheerilee chuckled, instantly regaining the colt’s attention as she craned her head back around to look over her classroom with lidded eyes. “I see that a few of you are already finishing up~.” She giggled, spotting a few foals around the room who had climaxed at around the same time. “Don’t worry if some of you didn’t last quite as long as some of your classmates. Trust me, you will all have plenty of time to practice before your ‘special surprise’ this friday~...”

Cheerilee couldn’t help but anxious. It’d been a doozy to set up, but today would finally be the big day. Her whole class was doing far better in their studies than ever since the introduction of her new ‘teaching method’. Not a single foal had scored below an A on a single assignment as of yet. Therefore, for all their diligence and hard work, they were certainly due for a very special reward, and no mere pizza party would suffice this time...

"Are you sure you need this for your class? I wasn't aware they went over these kinds of things at the schoolhouse?" The voice of Twilight Sparkle echoed in Cheerilee's mind.

A very large bowel movement would be critical if today's activities were to be successful, and thankfully, Ponyville's local spell and potion aficionado happened to have just the thing. She'd offered the excuse that it was needed for an explanation in class, and by some miracle, it had worked. Granted, the chance that Twilight Sparkle would have been able to guess anything remotely close to what she was really going to be doing with it today.

Cheerilee let out a shaky sigh, still feeling jittery as she glanced sheepishly up at her husband who stood beside in front of the schoolhouse door. Honestly, she could hardly believe how well things were going already, though nothing had even happened yet.

“You're sure that you'll be ready for me when I call you honey?”

“Yep.” Big Mac replied with a subtle nod, his characteristically calm demeanor shining through despite being fully informed as to what was about to go down.

His stoic neutral attitude contrasted starkly with the thick meaty shaft bobbling gently beneath his broad and muscular barrel. The stallion’s cock was truly a monster, though the fact that he was already a little excited was a good sign. As much as she’d been worrying, it seemed like at least part of him eagerly anticipated what his wife had planned.

Even now, Cheerilee wasn’t sure how she managed to convince him into agreeing to all of this. It wouldn't have surprised her in the slightest if he'd been downright appalled and disgusted when she told him what had been going at the school the past few weeks. Yet, even as she desperately tried to explain herself at the dining table, tears streaming down her face, he’d just sat there listening with a thoughtful expression painted over his muzzle. In the end, he’d actually come round... pretty much immediately.

Cheerilee took a moment to slow her increasingly erratic breathing. The tense excitement in the air was getting the better of her now, though could anypony really blame her at this point? Today would be the day that she’d not only be getting fucked by her husband in front of her entire class, but they’d all likely end up doing similar with each other before long. It just seemed too surreal to be true.

Every student had probably already arrived by now and was no doubt waiting excitedly at their desks for her to arrive, eager to learn what their promised ‘special surprise’ was going to entail. So, with one last deep breath to calm herself down, she quickly double-checked the contents of her saddlebags and reached for the doorknob...

Hushed conversations filled the air inside the Ponyville schoolhouse as students awaited the arrival of their beloved teacher. Some talked about what they were planning to do after class today, meanwhile, others pondered when they’d be able to have their next sleepover. However, the vast majority were locked in a classwide heated debate. What would the ‘special surprise’ that Ms. Cheerilee had promised end up being?

“Oh, wait! What if she shows us the inside of her panties, right after she goes inside em?!” One colt proposed.

“Aw, that’d be awesome!” A filly sitting behind him replied, biting her bottom lip as she imagined the scene playing out in front of them all.

“O-or, what if she’s going to use one of the toys she taught us about last week!?” Another filly gasped, causing many others to do the same.

“Oh, that’s totally gotta be it!”

However, before any concrete conclusions could be reached, the sound of the schoolhouse door opening sent a wave of silence washing over the room. Everypony quickly stopped whatever it was they were doing and faced forward in their seats. Cheerilee trotted calmly into the classroom, the front door swinging closed behind her as her huge belly almost touched the floor.

Her skirt today looked like it was cut to only a few short inches in length, leaving the mare’s black satin panties fully exposed as she made her way to her desk. A white blouse struggled to surround her swollen barrel, the buttons straining to keep the fabric together. Her flanks had also grown in size recently, though it was pretty clear she hadn’t bothered to buy any larger pairs of panties to accommodate.

For the moment at least, they remained clean and smooth as they clung tightly around her plot. The tension of the fabric stretching between her flanks would ensure that anything which happened to find its way inside of them would be made very obvious. As it is, the prominent shapes of both her puffy ponut and plump pussy were very well defined, leaving almost nothing to her students' imaginations.

“Good morning class!” The furiously blushing mare finally greeted, setting her saddlebags on top of her desk before reaching in and retrieving a large paper bag. Light from the morning sun that came through the windows shone right through the thin brown material, revealing a rather phallic-looking shadow sticking up inside it. A gasp of excitement from a filly near the back of the class was quickly shushed by all those around her.

“Good morning Ms. Cheerilee!” The class finally replied in unison.

Before she began, Cheerilee reached down into the paper bag, taking out a small purple bottle. Uncorking it with her teeth, she tilted her head back and hastily guzzled the contents. A few confused looks were shared among the class as they wondered what their teacher had just drunk. Clearing her throat as she set the now empty bottle down on her desk, Cheerilee turned to her class.

“Now, as you all no doubt are aware, today’s lesson is going to be a... very special one. Over the course of the past two weeks, all of your test scores have been improving dramatically! In fact, I'm very proud to announce that not a single pony in this room is currently sitting at a grade below a ‘B’!" She announced proudly, prompting cheers from the class.

"With that in mind, I believe it is high time that you all earned a reward for your efforts~.” She went on to explain, a saucy tone gradually bleeding into her voice.

A few exciting murmurs followed, with a few foals’ hooves subconsciously gravitating towards their crotch in anticipation.

“Therefore, for today’s lesson, I will be providing you all with an in-depth and very thorough example of several of the different concepts we’ve been going over together.” She explained, raising her voice as more cheers began to erupt. “First things first, however...”

Turning around, Cheerilee pulled the desk chair out from behind her desk and pushed it's back up against the front side of her desk, leaving the chair facing the deeply curious students as they all began to wonder what their teacher was up to. Reaching into one of her saddlebags, Cheerilee pulled out a small pink oval-shaped object connected to a tiny pink plastic box by a long cord. Blushing deeply at the mere sight of one of her favorite toys, she again turned to face the class.

“Would anyone like to volunteer to come up and assist me with this next part?” She asked, batting her eyelashes.

About half the room instantly raised their hooves, causing Cheerilee to chuckle at the eagerness of the foals. She scanned the sea of eager volunteers a few times until finally, her eyes fell on one colt near the front who seemed the most determined to get her attention. She quickly recognized him as the very same colt she’d seen erect the very first time she pooped her panties in front of them all. Standing up on top of his seat, the foal’s already semi-hardened member was in full view. Just like always, he'd not bothered to wear pants to conceal it.

“Ah, Pileup Plush, was it?” Cheerilee asked, gesturing to the colt.

“Y-yes Ms. Cheerilee, that’s me!” He yelped excitedly, practically dancing on the tips of his hooves.

If she was remembering correctly, he was far and above the student with the biggest overall improvement in his grades. He'd gone from making low Ds and Fs, to B+s in record time. Such hard work and dedication would certainly be worth rewarding~.

“Would you mind coming up here and helping me with something please~?” She asked, beckoning forward him with a wink and a wave of her hoof. There were a few short-lived groans of disappointment from some of his other classmates as the colt shook his head and leaped out of his desk. Still, they seemed plenty excited to see what Cheerilee was going to have him to do.

As Pileup trotted up to the front of the classroom, the mare turned and lifted herself up onto the chair. Turned towards the chalkboard so she was sitting backward. Her hind legs were left spread apart over the front end of the seat, hanging off either side while her voluptuous flanks hung a few inches over the seat. The fabric of her panties strained to span the even large gap she'd created between them. Stunned by the mouth-watering sight before him, Pileup took a moment to register that his incredibly hot teacher had started talking to him again.

“If you wouldn’t mind, could you please pick up that little pink capsule I left on my desk?” Cheerilee asked, leaning over and nudging the small device towards him. “You’ll need to pull aside my panties first, but I’d like you to put the round part as deep inside my pussy as you can. Do you think you could you do that for me Pileup~?”

The colt gulped, his heart pounding in his ears as his cock throbbed hard at the teacher’s bluntly put request. With a sheepish nod, he snatched the little device off her desk. On the other end of the cord, he found a small plastic box. On it was a red switch and a small dial that counted from one to three.

“Here you go honey, this might make it a little easier for you~.” Cheerilee cooed, drawing the colt's attention.

With no hesitation, Cheerilee reached back and, with both hooves, spread her flanks apart. The fabric of her panties finally collapsed inward, bunching up deep along the crack of her ass. He could already smell an intoxicating musk emanating from the mare’s backside, drawing him in closer and closer. Reaching out with his one free hoof, he very carefully slid the gusset of the mare’s underwear aside, finally revealing Cheerilee’s plump pussy in all its glory. He’d really only seen glimpses of it up until now, but those glances couldn’t even hope to compare.

His breath hitched as he witnessed the mare’s clit briefly reveal itself, winking out from her moistened vulva as his warm breath reached the mare’s sensitive opening. Inhaling her sweet scent from up close, the colt winced as his dick throbbed painfully. Never before had it felt so incredibly hard as it did right now.

But then, before he could even attempt to do what Cheerilee instructed, he was suddenly blasted by an entirely different odor as the mare’s ponut erupted.

*BRRRRRAAAPPTT!!!*

Pileup instinctively recoiled as he took the full force of his teacher’s flatulence to his face, instantly reminding him of a very similar incident from the day this had all started.

“Oops~, Excuse me~” Cheerilee giggled, biting her lip mischievously as she gazed back at the stunned colt standing behind her. Her puffy ponut continued to flex and tremble as if threatening to unleash another burst of hot air into his face at any moment. “I need to go so bad right now, I just couldn’t hold it in any longer~.”

Feeling his cock throb again, a primal urge to try and mount his teacher very nearly overpowered the virgin colt. Finally, with another shaky breath, he reached forward with the device resting in his hoof, hesitating only an inch from the mare’s steadily dripping pussy. Pushing onwards, he felt a shiver run up his spine as he pressed the small pink bulb into the mare's wet entrance. He could already feel the heat of her arousal on the underside of his hoof.

“That’s it, push it deep inside of me, as far as your little leg can go alright~?”

Doing as he was told, the colt’s foreleg began slowly but surely delving into Cheerilee’s quivering folds. Inch by inch his hoof disappeared inside the mare, her inner walls growing tighter and tighter as they squeezed and massaged at the very welcome intruder. It wasn’t long before he was up to his shoulder inside her, with the small pink box left danging in the air in front of the teacher's chair. Pileup suddenly realized his face was mere inches from his teacher’s delectable flower, and it took every fiber of his being to resist diving right in and lapping up all the sweet juices that were leaking from it.

“G-good boy~." Cheerilee shuddered, clearly enjoying herself. "N-now pull out slowly and leave that little capsule inside me, can you do that for me?” Cheerilee moaned, her whole body shivering every time he moved even the slightest amount.

Pileup slowly extracted his thoroughly soaked hoof from the depths of his teacher's pussy, until finally, he was free. A thick coating of the mare’s sweet-smelling secretions was left behind along its length. Even as he stared down at the matted fur, he could hardly believe what he’d just done.

“Now, if you could try and put my panties back the way they were and set that little box down on the desk where I can reach it, please? You’ve done a very good job Pileup. After that, you may sit yourself down right behind me. Please hurry though, I was just barely able to hold it while you were inside of me~.” Cheerilee chuckled, grunting softly as she repositioned herself so that her panties would be able to cover her backside again.

The colt quickly did everything he was asked to do, though admittedly it felt a little sad to cover up his teacher’s privates. After placing the pink box up on the desk within reach, he proudly plopped himself down on the floor right behind the clearly desperate mare, having earned his front-row seat for what was to come.

*Click*

“Aah~!” Cheerilee suddenly gasped, her legs tensing up as she switched on the device at its first setting.

Though faint, Pileup could just make out a faint humming from her backside. The tight fabric of her panties, once again spanning the gap between her flanks as best they could, showed her ponut as it flexed and clenching repeatedly while her pussy winked multiple times in a row.

“N-now class, f-for the first part of today’s lesson, we’ll s-start off with some more self-love p-practice.” Cheerilee stammered, already struggling to address the class and keep herself composed while the vibrator worked its magic. “T-this little box is going t-to make it very h-hard for me to hold it, so I want you all to pay very close a-attention for the moment I lose control~.”

Though some in the class had already started pleasuring themselves long before she’d said anything, the rest quickly understood what their teacher was planning to do and raced to catch up with their classmates. As colts all around the room started stroking their stiffening cocks and fillies rubbed their sensitive slits through their panties, Cheerilee let out a whimper as she was too overwhelmed with pleasure to stop a surge of pressure rearing its head at her back door.

*Prrrrrffptt~!*

“Oh Celestia, there’s so much!” She exclaimed as a second putrid fart ripped from her ponut.

Her hoof trembled as it sat idle atop the box’s intensity dial. The gassy eruption seemed to be her final warning. It wouldn’t take too much more now for her to break.

*Tick!*

“AAAhh~!” Cheerilee cried out, having turned the vibrator up to its second intensity setting.

Though there was no fart to follow it this time, the class quickly took notice of a glistening patch of darkness that was rapidly spreading through the fabric of their teacher's panties. Unable to hold back the tide any longer, the sound of urine spilling into Cheerilee's chair grew louder. It wasn’t long before an unstoppable flow of piss had flooded every inch of the mare’s panties. There were a few grunts from around the room as various students took in the sight of their teacher genuinely wetting herself uncontrollably.

“Mhh-ahh~” Cheerilee moaned, her hind legs trembling as miniature rivers of hot piss streamed down the inside of her thighs, streaking through and staining her clean coat.

Pooling in the seat, it wasn’t long before urine began to overflow and spill off onto the floor. Pileup watched the miniature waterfalls of leaking piss, moaning as the strong scent of his teacher's urine infiltrated his nostrils. The combination of arousing stimuli was almost too much for him, allowing the colt only moments to halt his rapid stroking as his climax raced up to greet him. The reminder that Cheerilee was almost certainly about to shit herself as well left him with a thick string of pre-cum dangling down from the tip of his throbbing cock as it seemed like even the slightest touch could make him cum at this point.

Cheerilee herself had also come close to reaching her limit, though she had no intention of giving herself even a moment to breathe. In fact, even she sat there, legs spread apart with another surge of pressure against her anus imminent, she didn’t hesitate to turn the vibrator to it’s final highest setting.

*Tick!*

“O-oh f-fuck~!” Cheerilee stuttered, back arching as her entire body shook at the thought of the now unavoidable accident she was about to have.

*FFRRPP-tchkk~*

Just as a third wet and bubbly fart began to sputter from the mare's quivering ponut, splattering the interior of her panties with speckles of liquid waste, a loud crackle signaled the emergence of her first log. Glancing up just in time, Pileup watched in awe as the thin fabric covering Cheerilee’s ponut was suddenly tented outwards several inches. He’d seen his teacher fill her panties so many times over the past few days, but never once from this close.

“I-it’s coming out~!” Cheerilee cried, reaching orgasm almost instantaneously as her asshole was spread apart by a truly titanic log of shit.

*Phttchhk~!*

A huge bulge was rapidly taking shape beneath the mare's flagging tail, one that only continued to grow larger and larger with each passing second as more and more waste piled into her soaked underwear. The fabric quickly reached its limit as it was unable to stretch any further, collapsing the long protrusion. Widening and spreading across her flanks, Cheerilee felt the slimy muck sweeping down overtop her sensitive pussy.

The constant soft crackling that accompanied the teacher's forceful bowel movement reached every ear in the room as the flow of solid waste gradually began to soften. In a matter of seconds, she could feel the hot gooey mess touching every little crack and crevice it could find within the confines of her panties. The thought of all that hot and sticky poop enveloping her pussy as it continued to wink, coating her sensitive clit with shit, sent the mare over the edge yet again.

“Ouugghh~!!!” She moaned, eyes rolling upwards as she bathed in wave after wave of pleasure.

Sitting right behind her, Pileup sat utterly entranced by the thick coils of creamy logs he could see building up against the seat of his teacher’s underwear. Though he’d done his best to hold back until now, the moans that joined Cheerilee's second orgasm was all that was needed for him to launch several thick ropes of sticky cum up onto his teacher’s ass. His whole body felt hot as he came, the tip of his cock erupting as he watched his liquid seed leap up onto the lumpy surface of Cheerilee's panties, again and again, soiling then even further while the entire class watched on in awe.

Like a chain reaction, several more moans and cries of ecstasy reverberated from the class as several colts and fillies reached their limits as well. Be it with their hooves entrenched deep between their trembling thighs or held tightly around their throbbing cocks, at least half the class came in unison. The sound of seed plastering the underside of desks was mirrored with the sight of fillies flooding their seats with sweet-smelling secretions.

As labored panting dominated the heated atmosphere the air in the classroom, Cheerilee was able to muster the energy to glance back at the colt splayed out on the floor behind her. An expression of pure satisfaction was evident on his face as his body continued to twitch and drool leaked from his mouth.

"T-thank you very much for your help Pileup... you may return to your desk now, okay honey~." She sighed lovingly, feeling totally out of breath as she enjoyed the small jolts of pleasure still being created by the vibrator. It was almost inaudible now, her pussy utterly enveloped by a thick layer of poop.

Pileup lay motionless on the floor for a few more moments as he recovered, still seeing stars. He eventually got to his hooves and stumbled back to his desk. Cheerilee couldn't help but feel her clit spasm as she watched the colt's softening cock hang below his barrel, a thick string of white fluid trailing along the floor from its tip. Finally flicking off her vibrator, she gently tugged on the connected cord, lightly gasping as the thoroughly shit-smeared capsule slipped free from her bulging panties.

Stepping down slowly and shakily from her chair, she cleared her throat and calmly brushed her slightly frazzled mane back with her messy panties still facing the class. Trotting back around to the right side of her desk, she looked towards the door and at the pair of green eyes that were peering in through its tiny trio of windows.

"Alright then class, for those of you who haven't quite finished yet, I hope you can hold out a little bit longer while your other classmates are recovering. You see, there's one more special thing I wanted to do for you all today, the real suprise~."

A few ears perked up at the teacher's promising words, with some in disbelief that things could get any better than they already were. Just the sight of Cheerilee's side profile and the huge bulge extending from her flanks seemed like an insurmountable view.

"Oh, honeyyy~? You can come in now~." She sang aloud, waggling her hips tantalizingly as she called out in the direction of the door.

*SLAM*

Cheerilee yelped in surprise as the front door violently burst open, revealing a very determined red stallion breathing heavily in the doorway. Suspended below him, his massive cock throbbed with raw desire, prompting a few gasps from the class as many gawked at the sheer size of the stallion's dick. None could imagine it being possible for it to fit inside of a mare. Even Cheerilee, who was already well accustomed to her husband's above-average girth, gulped anxiously at the sheer scale it had swollen to while he watched her from the window.

"W-well class, for this next 'lecture', me and my husband will be providing you all with an intense demonstration of this month's, uh... subject matter." She began to stammer, a bead of sweat rolling down her brow as the mare waddled her way up to the right side of her desk. "M-make sure to take plenty of very detailed notes!"

Rearing up, she carefully mounted the desk as best as she could, practically laying atop her enormous belly as she flicked her tail up over her back. With it out of the way, she presented her husband with her filthy behind, ready for whatever he wanted to do to it.

Yet, instead of rushing forward to mount her as both she and her class were expecting, Big Mac rather calmly trotted instead to the paper bag Cheerilee had left on her desk. Reaching down into it, he fished out the other toy she'd brought along for today. From the bag emerged a huge dildo. Bright red in color and adorned with several small bumps and ridges that ran up along its intimidating length, it honestly wasn't all that different in size than the stallion's own cock... though certainly not quite as big.

He snickered as he noticed his wife eyeing the phallic toy nervously. Trotting back behind her as she bit her bottom lip in anticipation, the stallion took a moment to first admire the teacher's massive panty load. Then, slowly but surely, he began to press the head of the phallic toy into the bulging seat of Cheerilee's underwear. Pushing into the packed pair of panties, the mare's voice hitched as the contained filth within was pushed up against her pussy.

"Oh, Big Mac~"

Reaching up, he hooked his hoof around the hem of Cheerilee’s panties and slowly tugged them down. The fabric gently peeled away from her shit-caked ass cheeks, taking away a small fraction mushy mass of waste that had spread itself all throughout them. Even as her underwear was brought down around her mid-thigh, an impressive lump weighed down its permanently ruined seat. With his other hoof, her husband brought the dildo up towards the mare’s thickly smeared pussy lips.

As all this happened, Pileup was already back in business at his desk, having regained his composure in record time as he watched the erotic scene transpire. Though he had yet to so much as touch his own shaft since cumming, the colt's cock was already rearing to go again, something duly noticed by the filly sitting next to him.

Cheerilee's yelped in alarm as she felt the smooth head of her favorite dildo suddenly lunge forward, penetrating her vulva with ease thanks to the wet filth that coated the shaft's entire length. Big Mac chuckled to himself as watched the mare’s anus twitch, clenching and unclenching as if begging to be given attention as well.

With a quick thrust of his hoof, the remaining length of the dildo speared through into Cheerilee's dripping pussy, spreading it wide as her flexing vaginal muscles worked to keep the welcome guest inside of her. Distracted by the blissful fullness she felt, she was caught off guard as two large hooves landed on the desk on either side of her head.

Tilting her chin up, she saw Big Mac grinning down at her, before feeling the telltale presence of another even bigger cock prodding up against her asshole. The heat of his body above her own was all she could really register before the stallion's hips promptly rolled forward and his crotch suddenly made full contact with her messy flanks.

*FRPTCHK~!*

“AAaah~!!” Cheerilee cried as her anus found itself being forced apart yet again. Thrusting himself all the way into her bowels, Big Mac grunted as he felt his wife's ponut clenching tightly around him.

From his desk, Pileup watched, now slowly stroking himself as he imagined being in Big Mac's place. As the huge stallion bore down on his teacher, rearing back for thrust after thrust, the colt's focus was drawn to Cheerilee's incredibly stretchy ponut. However, this did not last as he suddenly heard a noise close by that managed to pull his eyes away from the messy spectacle.

“Nmf~”
*Crackle~*

He was stunned to find none other than Sweet Flower bent over the side over her own desk, seemingly doing her best to mimic Cheerile’s pose with her flanks held high in the air in his direction and her tailed raised. While one of her hooves still worked tirelessly at her nether regions from beneath her barrel, the wet and sticky seat of her panties was slowly being pulled outwards. She was pooping her panties too, and from the look of it, she wasn't the only one. All around the room, solid waste and urine were finding their way into the seats of several foals' pairs of underwear.

Some, like Sweet Flower, made no effort to hide their uncontrollable urge to follow their teacher's example, displaying their 'accident's for all their classmates to watch. All the while, Cheerilee watched with lidded eyes as she gasped and moaned with each of her husband's forceful thrusts, her cheek pressed into the top of her desk as her tongue lolled from the edge of her mouth.

Suddenly, her eyes widened as a deep grumbling tremored inside her gut. Eyes flicking to the now-empty potion bottle sitting idle on the desk, she felt her abdomen tighten. It was finally taking effect.

"B-big Mac~!" She stammered in a vain attempt to warn her husband who was far too busy pounding her ass for all it was worth to hear her.

*SPRRRPT~*

"Mmff!" Cheerilee gasped, feeling a huge pressure pushing down through her bowels.

At the apex of yet another firm thrust of his cock, Big Mac finally noticed something was off as the tip of his dick slammed into something squishy and slick. Very quickly the sensation spread around the head of his cock as the rush of slimy waste from his wife's body finally began to ooze out around his pulsating shaft. As thick chunk after chunk fell down onto the desktop beneath them and into the already filled seat of Cheerilee's panties, his arousal only heightened as his thrusts came harder and faster.

Watching from his seat as his teacher began to shit once again, Pileup could take it no longer. Standing up from his seat, he turned to find Sweet Flower panting as she lay bent over the side of her desk, her whole body twitching as she underwent her third orgasm. Copying the motions which Big Mac had demonstrated in front of them, he yanked back the filly’s underwear, revealing the huge mess she'd already made inside them and the still-emerging log slithering through her cute little ponut.

Sweet Flower gasped as she felt him do this, looking back at the colt with surprise, though she made no effort to reject his advances. She could just spot his cock as he treated himself to an up-close view of her ‘accident’, her eyes tracking the bobbing shaft hungrily as it wobbled up and down between his hind legs.

Suddenly, there was a gasp from the front of the room. The dildo which has up until now remained embedded in her pussy had finally popped out, leaving her hole gaping and desperate for more. With a grunt, the stallion mounting her finally pulled his hips all the way back, allowing the dark brown tip of his cock to come free of her ponut with a satisfying 'Plorp~!'.

The stallion wasted no time in realigning his shit-smeared cock with Cheeirlee's vulnerable pussy as the mare braced herself for what was about to happen. Meanwhile, an inspired colt watched and followed along in preparation to thrust himself inside of his classmate, who was instinctively bucking her hips against him in eager anticipation.

A few sharp gasps and moans from elsewhere in the room briefly drew his attention. In the far corner of the room, a pair of foals were already going at it with reckless abandon. Slowly but surely, it seemed like the whole class was getting involved in one way or another.

With a wet squelch and a gasp of pleasure, Big Mac finally rolled his hips forward, the broad shit-smeared head of his cock pushing through the brown sludge that surrounded Cheerilee’s vulva and filling the mare's tunnel with his throbbing length. Cheerilee gasped sharply as he inserted himself, no longer caring even if Princess Celestia herself were to suddenly appear before them.

A yelp of pain and pleasure was heard as Pileup felt his cock crash forward into Sweet Flower’s virgin flower, his face twitching as every last inch sunk deep into the filly’s pussy. The walls of her vagina squeezed and massaged his length as sloppy chunks of manure continued to plop out from Sweet Flower's ponut. All the while, she continued to massage her clit with one hoof between her hind legs, barely aware of her own surroundings as she bathed in an ocean of never before felt pleasures.

She wasn't the only one, however, as Pileup's breaths were also growing heavier as raw instinct drove him, causing him to hump wildly as he raced towards an explosive finish. Finally, when it seemed like it couldn't get any better, he came. With three quick pumps, the colt shot his seed deep within Sweet Flower's pussy, letting out a moan of pure ecstasy as he emptied his balls for the second time today. He could feel her tight walls convulsing around his throbbing length as she came as well.

At the same time, a satisfied grunt from the front of the classroom came moments before a cry of pleasure from their teacher signaled a similar exchange between Big Mac and Ms. Cheerilee. Both Pileup and the stallion he'd been mimicking sighed in relief as they spent their loads, with the former suddenly overcome with a wave of tiredness as the strain from all his thrusting hit him like a truck.

Falling back onto the hardwood floor, his cock slipping free of Sweet Flower's hole, he leaned back against the side of his desk chair. Sweet Flower, on the other hand, remained bent over the side of her desk, having already passed out with a satisfied smile on her face.

Through labored breaths, Cheerilee lifted her head up off the desk to look out across the classroom. Almost every one of her students had gotten involved, and regardless of how things turned out by the end of today, it was all totally worth it~...