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Phillip blinked away the after-image that always seemed to accompany teleportation, and was greeted with the familiar sight of a small classroom. A dozen or so seats and their small tabletops were lined up in neat rows before the wide desk occupying the front of the room, with a homey assortment of paintings, diagrams, bookshelves, and supplies lining the walls around him. Recognizing a few familiar faces, he made his way to an empty seat, and settled himself in for another lecture from Mr. Mordaut, the resident draconic professor. The lanky human glanced up at the tall maroon dragon seated behind the large desk, presumably busying himself with one of the many tasks of an instructor as he scribbled something on one of the sheets of paper scattered before him, and Phillip pulled his own paper, quill, and ink bottle from his near-bottomless adventurer's sack.

A few more students teleported into the room during the few minutes before class was scheduled to start, and with a small dinging from an antique-looking grandfather clock nestled between a pair of bookshelves, Mr. Mordaut reached to sprinkle a small handful of sand over his paper. After shaking away the excess from the newly-dried ink, he carefully gathered up the sheets and placed them in a drawer beneath him, then laced his fingers on the desk and scanned the room with a warm eye. He always looked like he had some clever joke on the tip of his tongue, and it helped the adventurer forget that this was a dragon three times his size, capable of trouncing every single person in the room with ease. The fact that many of the students were seasoned warriors or powerful mages wouldn't make much of a difference to a full-sized draconian like him.

“Looks like everyone's here," the dragon said cheerily in his deep, baritone voice, the clawed fingers of one of his large hands tapping out a rhythm on the dark wood they rested on as he began to speak. “I must say, I'm particularly excited about today's class – it'll be a bit more hands-on than the usual lectures, and I think you'll like it." Phillip could've sworn he saw a twinkle in those spectacled eyes, and his curiosity was piqued. While he debated putting away his writing tools, Mr. Mordaut stood from his seated position on the floor and began to clear his desk, moving his ever-present stacks of books to another drawer below him, before he turned to write in his neat scrawl on the blackboard behind the desk.

Phillip leaned to one side to peer around the professor's red, sinuous neck as he wrote, and made out “DRAGON ANATOMY" written in large letters, followed by a few bullet-pointed notes partially obscured by his large body. The dark-red draconian dropped his piece of chalk on the tray beneath the board, and stepped around his desk towards the seated array of the students. Only then did the human's eyes catch a distinctly different shade of red between the dragon's legs, and he stared in surprise at the pale pink shaft emerging from his instructor's crotch. It had to be at least a foot long, though on the draconian's huge frame it looked reasonably to scale with the rest of him. Phillip's stunned silence was shared by the rest of his classmates, the sounds of papers shuffling and ink bottles opening having abruptly ceased. Mr. Mordaut seemed not to notice, or at least not to care, as he clambered atop his wide desk, kneeling on it to face away from his students, before lifting his thick tail and exposing his rear in its entirely.

A ring of the same pale-pink color as the dragon's erect shaft was nestled between his haunches and the base of his tail, and Phillip's eyes flicked across the draconian, trying to take in the expansive body and impressive assets while his brain felt as if it were frozen in ice. A pair of heavy balls lay draped across the oversized shaft, its hefty length capped by a gently-pointed tip, and a pair of thick, wide thighs flexed as the professor shifted atop his makeshift platform. The dragon's balls covered a decent amount of his large shaft in this position, each orb looking to be roughly the size of a crisp, juicy apple. Mr. Mordaut's smooth voice snapped Phillip out of his startled fascination, and he felt his cheeks bloom as he realized he'd been leering at the dragon.

“Alright guys, today's lesson is about dragon anatomy," the professor rumbled, his easy smile still on his lips. He launched into a brief explanation of dragon mating habits, and Phillip belatedly began taking notes, his sluggish-feeling mind latching on to the modicum of normality. Still, the draconian's rump being presented right in front of him made focusing on taking notes supremely difficult. Phillip had only written down a couple of lines, detailing a few of the ways female dragons chose their mates and how the physical appearance of the male was one of the primary factors, before the still-exposed dragon paused in his explanation for a moment.

“Now for the hands-on part of the class – I'll need a volunteer to help explain this next bit," he said, before waiting expectantly. The students around Phillip seemed to collectively hold their breath, and nobody spoke or raised a hand; the human expected they were all feeling just as surprised and unsure of the situation as he was. Mr. Mordaut, seeming puzzled by the lack of eager participants, spoke up again. “Come now, I don't bite, you all know that," he rumbled, then shook his hips at the class, strangely enticingly. The movement set his haunches jiggling slightly, and his long shaft and heavy-looking balls swayed pendulously beneath him.

The sight made the adventurer all the more aware of the growing strain in the fabrics around his groin, and he shifted uncomfortably in his seat, bringing one arm down in an attempt to inconspicuously conceal his crotch. “I really do need some help for this part, and like I said," the dragon continued, “I think it'll be fun." His eyes seemed to twinkle again as he scanned the room, before settling on one in particular. His slit pupils gazed at Phillip over thick-rimmed glasses, flicked down at the poor attempt at hiding one's arousal, then snapped back up to meet the human's eyes.

“Phillip," he boomed enthusiastically, a grin stretching his scaled face, “why don't you come up here and help me with the demonstration?" Phillip felt blood rush to his face, while simultaneously fleeing his extremities, leaving him with an odd combination of flushed cheeks and clammy hands. Still unsure of what his instructor had in mind, the human mentally made a brief prayer to every god he could think of, then stood on unsteady legs to walk between the other students and stand by the dragon. Mr. Mordaut looked larger than life from his perch, towering above Phillip's head, and it took some effort for the human to keep his eyes focused anywhere except the expansive rear and huge genitals just an arm's length away. Phillip belatedly clasped his hands in front of his crotch, attempting to hide his own erection, but he realized that very likely none of the other students were looking at him at the moment.

Mr. Mordaut nodded, apparently pleased, and while Phillip thought the dragon winked at him, he couldn't be sure; he could only see one side of that scaled face from where he awkwardly stood. Real or imagined, the gesture did nothing to help with his warm cheeks or cold hands. The draconian cleared his throat before rumbling in a low voice, “Thank you, Phillip. Now, go ahead and step up here…" The dragon paused, lifting one clawed hand to trace a pattern in the air, and Phillip saw a semi-transparent platform fizzle into existence a foot or two off the ground in front of the desk, directly behind the instructor. Before the human could guess at its purpose, Mr. Mordaut continued smoothly, “And mount me, if you'd be so kind."

Phillip felt like he'd given himself whiplash when his head snapped up to meet the maroon draconian's eyes, but all Mr. Mordaut did was give him a winning smile and an encouraging nod. He'd been in countless battles with bandits, monsters, and demons, but the thought of mounting a dragon in front of a room full of his peers was… Well, he'd been expecting to feel terrified at the thought, but all he could feel at the moment was the throbbing in his groin. Phillip glanced at his fellow students and saw them gaping like a bunch of deer caught in the torchlight, and only then did he notice several of them with hands or arms suspiciously covering their laps, and one particularly daring woman with a hand halfway down her skirt. It was strangely relieving to see them all having reactions similar to his own, so he steeled himself, faced the draconian beside him, and nodded in return.

Stepping up onto the thin platform, Phillip faced Mr. Mordaut, and an expansive rear and thick tail filled the human's vision. The dragon's ass was the perfect height, and Phillip quickly unfastened his pants to pull out his already throbbing shaft, the cool air of the classroom washing over the hot skin of his member. He placed one hand on the dragon's haunch, marveling for a moment at the warm, smooth feeling of the almost blood-red scales and the pliable flesh underneath, before guiding his now leaking tip to press against the draconian's entrance. Flicking his eyes up to meet his instructor's, Phillip saw the easy smile still on his face, the slightly mirthful glint in his eye, and that was confirmation enough for the adventurer.

Phillip slowly pushed his hips forwards, easing into the large draconian, and released his shaft to grip the wide, scaled haunches with both hands. Before he knew it, his hips were pressed hard against the dragon's, and the human's member was fully encased in the tight, hot, squeezing interior of his professor. Phillip exhaled in a rush, realizing he'd been holding his breath, and the dragon piped up in his typical cheery tone, sounding for all the world like he hadn't just taken one of his students up the ass.

“Now, as Phillip starts his work," the draconian said as he glanced pointedly at Phillip, and the human began to slowly thrust against him, pulling mostly-clothed hips away to expose everything but the tip of a rapidly-reddening human shaft, before sliding it back in. “You may see some changes. As I said – oh, right, hang on a moment." Mr. Mordaut halted his lecture prematurely to trace a few more patterns in the air with a claw, and Phillip jerked his head back in surprise as a shimmering surface manifested in front of his face, just out of the way of the dragon's hiked tail. The surface cleared to show the adventurer an image of… himself, from behind. Phillip glanced over his shoulder to see a similar-looking surface hovering above the desk he'd just been sitting at, and he could make out the back of his own head through it. Turning forwards again, the human found he could peer into the surface to get a good look at himself and, subsequently, the large draconian he were currently balls-deep in. He couldn't see all of the dragon, standing between the dragon and the portal as he was, but he could clearly see the dangling draconian shaft and balls hanging surprisingly far down between his legs. It was a slightly surreal experience, but Phillip's attention was pulled away – as far as it could be, with his throbbing cock occupying most of his conscious thought – when Mr. Mordaut spoke again.

“Now, you may all see some changes," the dragon rumbled. “As I said earlier, a large portion of a female dragon's choice of mate comes from the genital size of the male. Evolution dictates that male draconian's genitals should become larger and larger with each generation in order to stay competitive with each other, but as you can see, that's clearly not the case." The professor emphasized his words by shaking his hips again, setting his hanging balls and erect shaft swaying for the class, while simultaneously kneading at Phillip's still-thrusting shaft with powerful internal muscles. A quick intake of air was forced through the human's clenched teeth at the feeling, and at the sight through the small portal. “Dragons are hunters by nature," Mr. Mordaut continued, “and any bulky body parts not dedicated to that purpose would hamper an individual's ability to feed themselves and their brood. We find ourselves with conflicting evolutionary impulses. Who can guess what this might normally result in?"

The deafening silence from the students behind Phillip was only accentuated by the sounds of his rustling pants and jingling belt buckle as his hips rhythmically pushed and pulled against the draconian. After an almost unbearably long moment of this silence, some brave soul must have raised their hand, and Mr. Mordaut excitedly called on them. “Would it result in some… Compromise? A balance between the two at some… Evolutionary advantageous… Size?" Phillip could hear the uncertainty in the student's voice, either at their answer or the general situation at the front of the class, but the adventurer was finding himself caring less and less about his peers behind him, given the wonderful feelings coming from his crotch as he gently ground against the massive dragon ass before him. Phillip's fingers dug into the expansive flesh of Mr. Mordaut's haunches, and he could feel the draconian starting to press back against him with each thrust.

“Correct!" The professor said, his low, rumbling voice reverberating through the small room. “Genitals like you see now might become a happy medium for these two evolutionary impulses. But, some lucky dragon a few million years ago was born with a particularly useful trait, useful enough to be passed down to all draconians today – and I believe you should be able to see this trait in action any moment now." Mr. Mordaut shook his hips again, making Phillip clench your teeth, but the human focused his eyes on the image of the dragon through the portal in front of him. The massive, bestial shaft and oversized orbs had been set swinging again, but as the adventurer watched, something tickled at the back of his mind, telling him there was something off about them. It took several long moments of study before Phillip noticed it. The draconian's genitals were growing. It looked like each beat of the dragon's heart brought just a bit of extra length to his shaft, a tad more volume to his balls, and the rate of growth seemed to be increasing. After a few more moments, each pulse was visibly distinct, and the draconian's angular tip inched steadily further down the front of the desk.

“As you can see," Mr. Mordaut continued, “draconians have the unique trait of possessing genitals that grow to a much larger size in the presence of sexual arousal." His deep, cheery voice gave no hint to the fact that he was now grinding his hips against Phillip's with each press of the human's crotch against him, but Phillip imagined the students could see the movements anyways. The thought sent a warm flush through the adventurer, but he were too busy relishing the feeling of the dragon's tight rear massaging his throbbing, leaking cock to care for more than a moment. “And as our dear Phillip continues helping me out – a bit faster, if you would – you'll soon be able to see the full size discrepancy between a dragon made for hunting, and a dragon made for breeding." The draconian gazed directly at Phillip in the final words of his statement, and the human felt a shiver run down his spine.

A deep need flared up in the adventurer's groin, and Phillip dedicated himself to fulfilling his instructor's request, pumping his hips faster, finding a new rhythm with the large dragon as the two of them mashed their hips together. The human's deft hands kneaded and pressed against his professor's massive rear, the flesh alternating between soft and firm as Mr. Mordaut flexed and relaxed his hips against the thrusts, and Phillip's eyes were drawn away from the draconian's near-hypnotic gaze to the portal floating in front of him. The dragon's shaft was growing even faster now, with his balls not far behind, and neither showing any sign of stopping. The tip of his expanding cock released a drop of clear fluid, then another, and Phillip saw the draconian's increasingly heavy-looking sack tighten slightly as the tapered shaft flexed against the smooth wood of the desk. A longer strand of fluid leaked from his member with this motion, and the adventurer felt his groin grow warmer at the sight.

Phillip kept up the pace for what felt like a small eternity, struggling not to blow his load deep into the huge dragon he was desperately clutching at, but Mr. Mordaut wasn't making it easy. Phillip's view of his professor's continually expanding junk was doing wicked things to his mind, and then the dragon started making deep, rumbling cooing sounds. It was ridiculously adorable coming from the giant draconian, and the adventurer clenched his teeth in an effort to keep from flooding his instructor before the lecture was over. The dragon's growth slowed to a stop eventually, and Phillip's hips faltered when he saw the tip of the bestial cock almost touching the floor – it had to be at least two and a half feet long, and was as thick around as the human's thigh at its widest point. Phillip had the odd thought that it looked for all the world like a third leg hanging between his own, save for the massive balls that Phillip saw the dragon start to fondle them with clawed feet, gently shifting the overfilled sack from side to side, rubbing huge, scaled balls across the base of that incredible member.

The sights and sensations were growing too much for the adventurer, and Phillip struggled to control his breathing while maintaining his increased pace, thrusting in and out of the large dragon. Mr. Mordaut was hardly an inactive partner at this point himself; he ground his hips against the human, wringing Phillip's cock for all it was worth with strong, clutching muscles the adventurer hadn't known existed, and gave his student sidelong glances through half-lidded eyes with enough burning lust in them to raise goosebumps on the human's arms. Phillip's awareness of where he were, let alone why he were here, had long since faded, but his ears perked up at the sound of Mr. Mordaut's cheery, rumbling voice.

“Since Phillip is doing such a wonderful job helping me demonstrate, I – ah!" The draconian began to speak, then faltered, and Phillip suspected he must have hit a particularly sensitive spot. The instructor was certainly hitting all of the human's own sensitive spots as he clenched around Phillip again, harder than usual, and the adventurer did his best to repeat the motion that had gotten Mr. Mordaut's attention as he kept thrusting and grinding his hips against the dragon. “I believe, ahem, that I should_mmm_ be able to show you ahh – all of you a typical exam – ngh – example of a healthy draconian output," Mr. Mordaut finished in a rush. Phillip could feel his ego swelling with each hitch in the draconian's words, timed to an accurate thrust of his smaller body, and it didn't hurt when those wise, mirthful eyes turned to him. The human could almost sense a deep, primal need welling up behind them as the dragon spoke more quietly. “Phillip, hah, if you would be a dear," he started, panting slightly, but Phillip didn't wait for him to finish his request.

The adventurer pried his hands from those thick haunches to wrap his arms around the equally thick tail, the appendage as wide around as his own torso, hugging it against his chest as he began to slam your hips into your instructor with gusto. Your legs quivered with effort, but you continually propelled himself forwards and backwards against the huge dragon, using his grip on the professor's tail as leverage to push his shaft deeper with each thrust. Mr. Mordaut enthusiastically returned the favor, rocking himself atop his desk in time with Phillip's frantic movements, squishing his wide hips into the human's embrace with more than enough force to match the adventurer's. Phillip hesitated for a moment when he felt the unexpected sensation of a large, scaled tail sliding across his lower back and rear, until the professor used it to pull him close on his next thrust. The dragon repeated the motion to the rhythm of Phillip's hips, yanking him in tight each time the human pushed forward, driving him into the huge draconian harder, deeper, faster. The squeezing tunnel encasing Phillip's member felt like a furnace, and deft muscles danced across his shaft like a dozen tiny vices, driving him into a minor frenzy as he slammed his hips against the dragon's wide rump.

The portal still hovered in place before the human, displaying an image of his instructor's massive, dripping shaft. It was leaking like a faucet, flinging clear pre-cum in small arcs with every shake and rock of his hips, the strands leading to a small pool of fluid at the base of the desk. His oversized balls bounced and jostled against each other, fighting for room where they lay draped over his cock, and Phillip could see them starting to tighten and clench. The adventurer felt his own balls seize up, and with a strangled grunt, he tried to hold his orgasm back, but Mr. Mordaut's squeezing, clutching caress around his member would have none of it. The draconian practically milked Phillip's orgasm out of him, and with a gasp, he released, flooding the massive rear with seed, his hips grinding against the dragon's scaled haunches, unwilling to pull away from the heated embrace. It felt like the longest orgasm of Phillip's life, rope after rope of cum racing through his cock to be buried deep inside his professor, while the draconian's squeezing tunnel sucked and pulled at his shaft with powerful ministrations of hidden muscles.

Phillip's unfocused eyes saw white jets of fluid start to spray from Mr. Mordaut's tapered tip, splashing thick cum against the desk and the floor, while the dragon's massive balls drew themselves higher against himself as they forcefully expelled their load. The human heard a low, guttural moan reverberate through the room, but he weren't convinced it wasn't his own groans of pleasure echoing in his skull. Phillip hung on to the dragon's thick tail for dear life while orgasms thundered through each of them, the draconian wringing what felt like every last drop of cum out of him with that gripping, squeezing tunnel, the heat of their bodies' union becoming almost unbearable to the adventurer as he felt like his mind was melting. The professor's scaled rear humped and ground incessantly against Phillip, Mr. Mordaut's needy, blazing-hot passage milking his cock like a thing possessed, and the human gasped for air while the draconian's powerful internal muscles kneaded his shaft into an indistinct mass of blindingly pleasurable feelings.

Before long, Phillip's orgasm slowly wound down, his twitching cock letting out a few final spurts of cum, but Mr. Mordaut held him tight. Pressing the adventurer close with his tail while his rear continued to squeeze at the human shaft still buried inside, the dragon's orgasm persisted long past Phillip's own. Thick, white cum made a widening pool beneath their feet, and Phillip had to grit his teeth through several long moments of his increasingly sensitive shaft being suckled and pressed at by muscles built for a dragon. The professor fired small geysers of cum against his desk and onto the floor, and by the time his output slowed and finally, blessedly, ceased, there was a puddle of viscous fluid several feet across below the translucent platform. The dense liquid didn't spread as rapidly as Phillip would've expected, but he were too exhausted to think much on it.

The adventurer slumped forwards, panting with exertion, and was gratified to hear Mr. Mordaut seeming similarly out of breath. The dragon's twinkling eyes turned towards Phillip, his reptilian mouth hanging open in a goofy-looking smile, and the human had to strain to hear his professor's words over the sound of his own heart pounding in his ears. “Fantastically done, Phillip," the dragon rumbled quietly, then nodded towards the side of the desk. The adventurer's air-starved brain took a moment to process that as a sign for him to step aside, and he had to work to extract yourself from his instructor.

Phillip's legs felt like they could barely support his weight, and his cock tingled something fierce when he slowly drew it from that wonderful, scaly rear. The human stumbled backwards off the platform, not caring that he stepped in a thick puddle of dragon cum on his way, and shuffled to the side of the desk to face the class again. He belatedly realized he should probably make himself decent, but after seeing just about every person seated before him with either a cock in their hand or fingers beneath their undergarments, Phillip figured his free-hanging genitals could wait until he caught his breath.

Mr. Mordaut had turned his head towards the rest of the students, and his deep voice filled the room again. “Thanks to Phillip's assistance, we've all been able to see first-hand some of the lesser know qualities of draconian anatomy," he said easily, apparently having recovered from the ordeal much faster than the human had. “But I always find that seeing something is a poor excuse for experiencing it." Phillip blinked in surprise. The dragon couldn't seriously be suggesting what the adventurer thought he was. “Now," Mr. Mordaut boomed, shaking his wide hips just as he'd done before the “demonstration," but this time with much more pendulous swaying of oversized genitals. “Who'd like to go next?" The words were barely out of his mouth before Phillip heard the scraping of chairs and rustling of clothes in fumbling fingers, the students moving to take up the draconian on his offer. Phillip let out a huff, leaning against the desk, and tried to recover his stamina faster. He suspected this was going to be a very, very long lecture.