Potion Mastery

Story by Luvian on SoFurry

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An alternate take on Potion Expertise, where Kyzyr doesn’t stop testing the limits of his new toy.


If one were to look inside the pine tree Luvian called home, the scene that would be stumbled upon would be quite a shock. The wolfbird himself nearly unconscious, leaking cum from his muzzle as his limp limbs sunk into the grey furred orb of his belly, the contents sloshing and glorping within. The perpetrator a large, blue-scaled dragon, buried balls-deep in the hybrid's rump. The drake was Kyzyr, and he had just finished settling a claim on the wolfbird. Well, almost finished. He still had to actually mark the grey fur to prevent others from challenging him. But just as he began to trace a paw over Luvian's spine, he had a thought. His new toy had reacted differently to the potion. It had been designed just to negate the lust-prevention concoction, but when he'd walked in on the hybrid, he'd been in a pseudo-heat, giving off a scent that had driven all thought from his mind. How would he react to other potions?

Of course, if he was going to continue today, he'd need to bring the hybrid outside. The tree was nice, and clearly had a lot of work put in it. He was loath to cause irreparable damage, or even worse, kill the tree with his actions. It would be difficult, to say the least, to get the wolfbird down the staircase to the first floor, not to mention out the door, but the reward was well worth it, in his opinion. Especially since he could really just push the wolfbird across the floor. The wooden surface was well worn, and the rather, well, smooth surface of that grey belly would make it easy and splinter free. Another splash of liquid, this one lapping at his feet, brought him back to the current situation, that being the draining wolfbird, unable to tighten after Kyzyr's rather rough treatment. He'd been slowly reducing in size during the drake's musings, and while cum now quite thoroughly covered much of the floor, and utterly drenched the bedding, the smaller male was now a size where he could be lifted and carried without strain.

Kyzyr picked up the wolfbird, adjusting his grip in order to keep him from leaking as much as he had been, before heading down the stairs, the smell of his toy, so close to his muzzle, making his shaft, no longer hyper-sized, stiffen and leak pre once again, the tip pressed again Luvian's spine. He had to hold himself back from trying out the wolfbird on the first floor, but his restraint broke by the time he stepped out of the pine tree home, dropping the hybrid on the ground, the loose hole between Luvian's rump cheeks letting loose more cum, soaking into the soil. Not tight enough for any sort of pleasure, luckily there was still another hole for use, one he knew worked just as well in filling that cute little belly.

He slapped his cock against the wolfbird's muzzle a few times, teasing him with what would happen next. After all, it's not like he was in any way done with his new pet! The second those cum-soaked lips parted, he thrust in, tip disappearing between the hybrid's jaws, pre spurting from it to coat the hybrid's tongue, mingling with his earlier climax as it dripped down that tight throat. A feature he planned on taking full advantage of. But he had to make sure the wolfbird stayed nice and snug around his length, and so he wrapped a hand around Luvian's muzzle, forcing his jaws shut and preventing him from opening too wide. Pushing more inside, Kyzyr felt his first ridge press against a cold nose, grinning down at those lidded, glazed eyes. “Don't worry, little birdie….just gonna give you some dessert before I give you a break." And with that, he pushed his ridge past Luvian's lips, growling in delight at the feeling of teeth tracing over it. There was no concern about biting, after all the hybrid was too out of it from both the earlier potion, and the hole-breaking stretch he'd been given previously. Such a shame he wasn't tight back there anymore….oh well, he'd fix it.

Sawing his spire in and out of Luvian's mouth, Kyzyr was determined to take his time this time around, popping his first ridge in and out, threatening to dive down that tight throat each time the wolfbird's muzzle was pulled against his second ridge. Until he finally went through with the implied threat, pushing his cock deeper, groaning in pleasure as he felt his tip surrounded by tight muscle, mixing with the feeling of teeth continuing to drag over sensitive flesh until he was near the edge of orgasm. Determined to only climax once he was hilted, he waited a few seconds before pulling free, taking it slow and steady, making sure his wolfbird had plenty of time to breathe between thrusts. He kept that muzzle tight around his length, though, even as he pushed his next ridge inside, beginning to lessen his pressure around Luvian's jaws, letting them part to accept more of his cock. “Thaaat's a good boy…" he murmured, pulling out to the tip once again. “Gonna make you take it to the hilt…."

Unfortunately for the hybrid, Kyzyr had grown impatient with the slow pace, a snarl ringing out as he let go of Luvian's muzzle, only to push the entirety of his cock inside, bulging out that grey furred neck as he sped up. There was still time to breathe, Kyzyr was not nearly far gone to forget that, but there was significantly less time for sure, pre splattering the ground, the hybrid's belly rippling with the power behind each thrust. He was on the edge, several seconds was all he needed….

There was no roar to accompany the drake's climax, merely another groan of pleasurable release as he held the wolfbird's head against his crotch, cum once again flooding down the tight throat of the hybrid. By the time Kyzyr finally pulled back, he could tell the wolfbird's belly had regained some of its previous size, sloshing in a renewed, lewd symphony. The pull-out was slow, each ridge slurping past Luvian's lips, shining clean with the hybrid's saliva. An order never given, but one appreciated greatly. Giving a small pat on that fluffy head, the dragon finally pulled his tip free, replacing his shaft with the lip of the vial he'd been carrying in his other hand the entire time. “Go on…." Kyzyr coaxed. “Drink. It'll help you, my treat." Among such words, and gentle pets of his hand, the contents were drunk, and the dragon circled his immobile toy to watch the results. Disappointingly, there didn't seem to be any special side-effects this time, but it still did it's job, the gaping rump of Luvian slowly tightening under his gaze, until the wolfbird looked as though he'd never been fucked by a hyper dragon, the slow leak of seed stopping now, the contents trapped within, keeping the male immobile on his gut, though his limbs now trailed through the grass.

Sadly, Kyzyr would have to part from his toy for a moment. He'd only brought the potions he'd already used, and would need to visit his shop to grab the ones he was determined to test (and possibly a few he just had to use once more….). He was sure the hybrid wouldn't be going anywhere though, even if he lost the fucked-brainless mindset he currently carried. After all, that belly prevented flying, and he had no way of getting onto his talons to waddle somewhere an bipedal dragon such as himself could not reach. Giving one last pat to the wolfbird's head, the dragon spread his wings, and launched himself into the air.

Despite the landscape rushing past him, wings straining from the exertion, Kyzyr felt like he was too slow, mind full of plans upon plans, potion effects and what might happen when drunk by the wolfbird consuming his mind, not to mention daydreams of feeling that tight rump around his cock once more. Still erect and throbbing with arousal, the drake finally landed back behind his shop, dashing into it.

A pouch, larger and with greater pockets than the one Luvian had worn during his visit, was slung across his chest, the dragon nearly throwing himself into his stores. He couldn't test them all at once, due to potential negative effects, but there were still plenty of potions he could pour into his pet. Not to mention the potions he could drink himself. A slightly more potent version of the hyper potion from earlier, joined by a bright red vial, went into the pouch, followed by two variants of a water-breathing potion. They'd be his initial 'tests'. The next potion was grabbed, and sloshed violently as he let it fall into the pouch, clinking against the others before being jostled itself by a radiant blue vial. He nearly left it there, but as he turned, a label caught his eyes. The only hint on the outside of the effects was a licking of lips, before it too joined it's companions. Pouch sealed, panting with lust, Kyzyr rushed outside, rocketing into the air as he sped back towards his toy.

The hybrid had managed to regain a bit of his cognizance by the time the drake returned, the blue-scaled male noting the turning of his head, the attempts to fix his current state. The thump of his landing behind the immobile hybrid was met with a squawk of confusion, the lupine head twisting and turning in an attempt to get a glance, much to Kyzyr's amusement. He didn't give any sort of hint to the wolfbird, instead letting the clink of vials be his words, the hyper potion drunk quickly, followed by the red potion. The feelings elicited made him throw his head back with a groan, shaft repeating it's earlier transformation. Cockflesh began to push out from his sheath, joined by the pulsing, sloshing expansion of his balls. The other potion that had been imbibed hinted at its purpose with each pulse of growing spire, no hint of the ridges that wrapped around his original length. If one were to look upward, in fact, they would see the ridges sinking back, vanishing beneath the surface. Still his spire grew, surpassing the growth from earlier as he clenched his hands into fists, sheath bulging with something utterly gigantic, before the rump-breaking knot popped free, the entire shaft dipping under its own weight. Panting, his lustful eyes took in that tight rump, pre spraying from his tip and giving it a glaze, a yip sounding out from the squirming hybrid. Growling, he lined himself up, enormous balls dragging over the ground. He paused here, letting the wolfbird feel what he'd be impaled on, paw dipping into the pouch still wrapped around his chest to pull out the two potion variants.

He let the first pleading words ring out, but before the wolfbird could do more than plead (and almost sound like he was pleading for Kyzyr to press in) he thrusted, the words morphing into a soundless cry as he was immediately stretched wide. Before he fully let himself be subsumed in baser instincts, the drake poured the two potions into Luvian's gullet, wrapping his hand around that furred muzzle to keep the wolfbird from spitting them out. It took a minute, but the swallowing sounds as the contents were drunk were well worth it. He must have not many other blue dragons, for as he withdrew his paw, and began to push, his efforts were met with a call of his name.

“Kyzyr?!?"

He answered by gripping the wolfbird's hips, drawing back an inch of cock to thrust deeper, grinning as he felt the call turn into a groan. Still, he offered no words of identification, continuing to thrust deeper, rump spreading wider and wider, straining with all it could to stay tight around the dragon's 'lance.' He felt his cock push into the wolfbird's gut, a gurgle of cum being pushed past resisting lips music to his ears. But he had bigger plans. Much bigger. Angling his shaft, he pressed further upward, confused gurgling echoing out as he pressed forward, the ring of muscle inches from his knot, his tip poking at Luvian's throat. Bending over his pet, the dragon pressed those last, knot-free bits of shaft inside, letting Luvian feel the knot about to break him open, the balls pressing against his talons that sloshed with pent-up seed. And finally, he whispered in the wolfbird's ears.

“Don't worry, little bird. You'll breathe just fine, even as my cocksleeve."

He gave no time for the hybrid to respond, straightening and pulling out in one smooth motion, thrusting back into the wolfbird with a loud smack. He couldn't move very fast, or pull out far, with how large (and unwieldy) his balls were, but that didn't stop him from making sure each thrust pulled a yelp from Luvian, grinning with lustful delight as he ground his knot against the wolfbird's tight rump. Each slap of joining hips was wet, pre-cum matting fur and shining on scales as Kyzyr worked over the straining ring, feeling it weaken bit by bit. He took advantage of the loosening hole, pressing more of the knot in, moaning himself as the nerves that throbbed over it were pressed upon. The yelping was slowly stopped, replaced by the silence of panicked breathing. The dragon grinned.

His cock, massive as it was, was steadily making its way up the wolfbird's throat, bulging out behind the hybrid's ribs, preventing sounds from escaping. The hybrid himself was wide-eyed, freaking out as he continued to make the motions of breathing, despite the impossibility of such, his lungs squished beneath creaking bone and turgid spire. Moving a claw, the drake traced the bulge as it dragged in and out of his toy, part of him worrying for a second about how he'd leave his pet when it was over, only to feel the hard, natural structure bend. 'Ah', the part of the dragon not consumed with sinking his knot into the wolfbird. 'So that was the other effect of my tightening potion.' The wolfbird was now stretchy. Probably not to the point of a snake, but enough to take the hyper-sized shaft the dragon carried.

Curiosity satisfied, he focused every part of him on fitting his knot into the hybrid, even as the bulge of his shaft began to push into that furry neck. It only took a couple more thrusts, each one getting closer and closer to the point of no return, before, roaring in delight, Kyzyr felt Luvian sink all the way in, ring loose around his base as it was broken once more. But he wasn't focused on that, barking out a laugh as he saw the tip of his cock, pushed free of the wolfbird's muzzle, dripping pre down it's length as the wide-eyed hybrid was impaled from end to end.

“Guess I wasn't wrong about the cocksleeve bit!"

He pulled back to the center of his knot, watching as his cock disappeared back into the hybrid, only to reappear as he pushed down to his base once more. The fucking continued, pre rolling over Luvian's face each time his shaft exited the hybrid's jaws, a lewd mask leaving the hybrid's nose clogged with musk. He came closer, decisions on what to do rattling in his own lust-drunk mind. Should he climax as is, the wolfbird like a fountain decoration around his cock? Or should he cum inside, see how much more cum could be taken. It was the thought of another potion, clinking in his pouch, that decided it for him. He pulled back, shuddering in delight as that loose hole slid over his knot once again completely, eyes rolling back as he nearly came then and there, holding on with the metaphorical tips of his claws as he pulled completely out of Luvian's throat. No time was given for words, the drake snarling as he thrust back in.

His knot pressed against the hybrid's hole, the muscles strained open once again. But it was not the chest of Luvian that bulged this time. As the dragon's length was pushed back in, the bulge of his belly, once only cum, began to grow, wrapped tightly around the spire of dragon dick. His hips met the wolfbird's, but there was no time for Luvian to take in the fur wrapped cock pushing past his head. The earth-shattering roar, deafening to the hybrid, signified a climax, the dragon clamping his hand around Luvian's jaws once more.

The wolfbird's belly exploded, the only thing keeping them together being the knot of dragonflesh. Kyzyr himself could feel the furry condom that was Luvian's middle press against his legs, skin stretching and groaning from the pressure. And still he grew, the flood forcing the drake to dig his claws into the earth, nearly knocked over from the sloshing orb. Still, even the stretchy hybrid seemed to have limits, though he nearly took it all (at least based on the shrinking balls of the drake). A deluge of seed poured from the lips and nose of Luvian, pooling in the divot he made atop his belly. It was nearly another minute of cum before the drake finally wound down, the wolfbird swimming in a pool of seed atop his gut.

He didn't want to pull free, didn't want to see that belly shrink. But the wolfbird's size was getting a little ridiculous, even for a dragon such as him, as so, feeling his cock begin to morph and shrink back to normal, Kyzyr tugged himself free. Another flood of cum, this time out of the hybrid, was left alone, the dragon watching as cum pooled across the clearing, shimmering in the late afternoon sun. The gurgle of the wolfbird reminded him, as it had before, of his next objective. A potion was grabbed, the purple liquid shining as he made his way around to Luvian's nearly submerged muzzle. He pulled the hybrid's muzzle up, took in the cum-coated fur, the dazed, bleary expression, and grinned. “I expect you to be wearing this expression a lot, little bird…...Now drink up. Got to make sure you don't get too large." Sticking a finger between cumstained lips, he gently pried the wolfbird's jaws open, and emptied the vial down a cum-coated throat, making sure every last drop slid down into that sloshing gut.

The effects were slow, and Kyzyr sat on a clean patch of grass to watch, resting his feet while looking for more of the hybrid's interesting reactions to his concoctions. Under his gaze, the massive orb of dragon seed Luvian sported began to shrink, his seed seeming to vanish. Or be absorbed at fuel. At first, there didn't seem to be anything besides the intended effects, and a bit of disappointment began to creep in, especially as the pool of seed Luvian rested in was pushed off the shrinking gut, limbs beginning to brush cream-colored vegetation. Until his eyes finally noticed the change. A gradual, nearly unnoticeable difference that brought a wide, cheek-splitting grin to his lips.

Getting to his feet, the dragon strolled over to the near-comatose hybrid, and put a palm on the hybrid's rump. His hand squished down, more than it had before, sinking into the layer of padding forming on the hybrid's rump. A nice, plush seat for him to pound into oblivion, joined by hips and thighs as his pet shrank some more. He continued to knead during the remainder of Luvian's growth and shrink, pulling the hybrid up and against his chest when the wolfbird reached a point where he'd have to bend. He was nearly tempted to test out the improvements then and there. But he had to be patient. There was one more thing he needed to do before he felt that rump, loose as it was, wrap around his cock once again.

By the time the cum-drenched hybrid was finished, he sported a respectable rear. Enough to give a moderate curve to his rump, his hand squishing at least an inch deep into the padding. Of course, the thighs were just as nice, thick enough to support into the soft ass he sported, steadily slimming to match his taloned lower legs. Of course, he couldn't let the gains go unnoticed by the wolfbird, unresponsive as he was.

“It's only right that my little bird has a pair of drumsticks to match…..And I can only hope your rump wobbles when I pound your ass. Now, wake up, little bird. I want you to raise your rump yourself for this next part."

The second to last potion was drunk, the bright blue sliding down Kyzyr's throat. The dragon stepped back considerably, lust still burning in his eyes, before he doubled over with a groan.

And grew.

But the dragon did not simply become a giant iteration of himself. Joints rotated and changed, the creak of bone and muscle beneath his hide audible. His legs shortened, the drake soon rising once again. This time not on two legs, but four. Kyzyr had become a feral. He stood tall, looming over his pet, his toy. A crown of horns circling his head, his wings arching overhead like a ship's sails. Scales slid out from beneath scales, a fine chain mail that flexed and stretched with each movement he made. Spines pushed up from his back, trailing from his crown down to the tip of his tail, the appendage swaying as it grew. In fact, Kyzyr continued to grow, until he stood several feet higher than he did normally, slitted eyes staring down as his recovering treat. His cock ached, rigid and ready. It was not as long as it had been while he had been hyper, shorter by a good foot. But it made up for that with thickness, the length as wide as the wolfbird's torso at the base, not including that final, throbbing ridge. Fed by two churning balls, their load hanging hot and heavy between his hind limbs, swaying with each step he took forward.

His muzzle was just a foot from Luvian's, watching those eyes clear, the senses return. The fear alighting over his fate was….disappointing, but he'd train his little bird to crave these moments. For now, he bared his teeth, forepaws ensuring a lack of escape as he repeated an earlier request.

“Present. Your. Rump."

He waited impatiently, eyes narrowing at the lack of obedience. After several moments, he snarled, forepaw batting the wolfbird lightly. The hybrid was sent rolling, the drake using the opportunity to position both himself and his pet. Those furry wings were stretched out carefully, before being pinned beneath his paws. His tail pushed against the hybrid's legs until they were perfectly positioned, that tempting, loosened rump brushing against his tip, precome drizzling across those thickened globes like dressing. He luxuriated in the sensation, ignoring the pleading of his pet as he licked his lips, and shoved himself forward.

Resistance was minimal for those first few inches, the tip alone spreading the wolfbird as wide as he had before the transformation. But that wasn't what Kyzyr focused on. Instead, he nearly moaned at the feeling of that rump sliding over his shaft, thick cheeks spreading wide, yet still soft enough that if he had hands he'd be kneading them, making sure his little bird knew just how much he appreciated the gains. Of course, right now Luvian was silent, the wolfbird seemingly struck dumb by how much cock he'd alreaddy been stuffed with. He'd have to see if he could fuck a moan or two loose.

Slowly, carefully, the dragon pulled back, the tight ring of the hybrid nearly making it so he'd be already stuck tight, despite not being at the first ridge. The scenario itself barely prevented by how he had his toy pinned. But nonetheless, he pushed back in, shoving himself deeper until his first, massive ridge pushed against that strained hole, pushing against the nearly broken rump of his pet. The choking gasp from beneath was like music to his ears, a chorus to the lewd sounds of sloshing balls and stretching holes. But despite the bulge forming in Luvian's belly once again, Kyzyr still wasn't satisfied.

Again and again, slammed his hips against the soft rump wrapped around his tip, each impact of his ridge leading to a grinding demand that nearly threatened to break through. He only wished he could see the wobbling of Luvian's rear, but hearing the slowly breaking resolve would have to do, each noise closer and closer to a moan. The belly bulge softened, like it had so many times before, as pre flooded it, bloating it out like a hearty meal, or a female's early months of pregnancy. Growling in discontent at the length, Kyzr forgo the pounding, and instead just pushed against that giving ring, demanding entry. And with a canine moan, and a loud SHLRK, that first ridge finally slipped it's way in.

With Luvian now trapped on his shaft, he had no problems with releasing the wolfbird's wings, instead shifting a paw to press down on the wolbirds upper chest. Enough to keep him pinned, light enough to allow breathing. But most importantly, a greater point of leverage to pound his bird raw. Pushing in, the broken hole yielded easily, sliding over each inch of the widening length with little resistance compared to moments ago. A toy fully broken in. And one with his mind finally following it's needs, based on the second moan that rang out, leaving Kyzyr throbbing in lust.

It was time to push on.

He pushed down to the next ridge, feeling that hole nearly gobble it up, leaving Kyzyr growling in pleasure at his greedy little bird. But he pulled back anyway. Such a lovely pet was to be savored, especially during the finale. And so each belly-stretching ridge was teased at the widened hole before being pressed in, each one leaving the wolfbird moaning, cum spurting against the ground as his belly grew. Unlike before, the dragon made sure to stay within the hybrid's body, gut stretching until it pushed against Luvian's muzzle. Here, he found another problem. One that he eventually realized he could not solve today.

While Luvian's body was certainly stretchy, and had taken nearly all of Kyzyr's feral cock, there were still limits. Ones that had been reached. No matter how much he pulled, grinded, or otherwise tried to bully his last ridge into his nearly catatonic pet, there was no way it would fit. At least, not on his first attempt. So he simply popped his last, fitting ridge in and out of the wolfbird, closing his eyes and enjoying the moaning, sloshing form beneath him.

The wolfbird's body was a bloated cocksock, in basic terms, but soon enough he be a lovely condom, the thrusting increasing as Kyzyr lost what little control he had left, snarling in want until he pressed as deep as he could go, and let loose with a roar that shook the trees, and seemed to rumble in the earth itself.

The form beneath him exploded in size, the position perfect for Luvian's shaft-stuffed gut to grow, pressing against the cum-stained grass before pushing out like a wave. It wrapped around the dragon's hind legs, pressed against the scaly sloshing orbs that currently dumped every speck of seed they held into the furry hybrid. It was glorious. A climax he was sure Luvian would not forget, especially when seed leaked from his nose and muzzle, prevented from escape due to the massive length of dragon stuffed under his feathery tail.

It seemed to go on for minutes, but eventually Kyzyr came down from his high, panting as he carelessly pulled free, shaft draping itself over his orbs and nearly brushing against the ground as it softened. He took in his pet, eyes taking in the nearly white pelt, the gaping hole between soft cheeks that gushed cum like a waterfall. All connected and worn by a bloated, moaning wolfbird that needed just one last thing…..

It was harder as a feral, but with the tip of one large claw he delicately traced the necessary rune that would mark Luvian as his. His little bird, his pet. The mark was black against Luvian's fur, unable to be removed by washing or trimming. A bit larger than necessary, but not one anyone could miss. Finished, he curled up next to his wolfbird, watching with one shimmering eye as he waited for his transformation to wear away.

It took an hour before it happened, some subtle aches returning as Kyzyr returned to his natural, two-footed state. The wolfbird had drained quite a bit, now just as big as the anthro drake. He'd not realized he'd come that much as a feral, but it was certainly not something he'd complain about. Alas, it was time for him to leave, and let the wolfbird recover until his next visit.

As he took a step away, he foot clinked against something, and he looked down to see his heavily damaged satchel, and the single potion left inside. He'd nearly forgotten about both, but seeing them now brought back the thought he'd had in his store. Considering the vial, he pondered it, mind clearer than it had been previously. Before he shrugged, and tossed the potion aside, letting it smash against a tree trunk. While it would have been quite the amusing sight, seeing his pet waddling about with a belly of eggs, he had done enough to the wolfbird, and didn't see himself as cruel enough to pull that on Luvian while he was clearly in no state to converse. Something to consider another time.

Spreading his wings, Kyzyr lifted himself into the air, and headed home for the day. He'd check on his little bird in a week or so, then start the wolfbird on his training.

Luvian did need to learn how to properly serve his dragon, after all.

The End