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Luka was hyped. He'd managed to grab a can of Horse Power™ at a pop up shop downtown. The extremely elusive energy drink promised to give anyone who consumed it the power and virility of a horse, something he was all too eager to experience. He snapped a picture and sent it to his friend Slick. He knew the Cabbit would be jealous of his latest acquisition.

As the German Shepherd unlocked his apartment, he could feel the anticipation bubbling within him. As soon as he closed the door behind him, he ripped the can out of the bag he'd been carrying it in, popped the top, and chugged the entire contents, unwilling and unable to take his sweet time and savor the rare flavor.

It was salty, thick, slightly yellow, and only barely carbonated, but Luka didn't take much notice. The second the liquid hit his stomach, he felt a groaning down below. At first, he thought it was his stomach, but it was further south than that. With a start, he realized it was his balls.

As he struggled to unbuckle his pants, he could feel his growing orbs pressing against the crotch of his jeans. They groaned as they strained against the fabric, and he could feel them rumbling as they started churning with fresh seed to fill their rapidly growing volume.

As they pumped fresh hormones through his system, Luka could feel his strength growing, and in a fit of frustration, he tore his pants from his waist as his expanding balls ripped through his underwear, desperate for space to breathe. As they dropped between his thighs, the fur that had once covered his tight sack of round, canine testes sloughed off, leaving behind a throbbing, aching pair of black stallion balls that sloshed with immense reserves of cum as they jostled in their sack, hanging down almost to his knees already.

He reached down to feel his now grapefruit sized balls. They completely filled his paws, and he could feel the heat pouring off them. A fire of lust pounded within as with every beat of his heart, a wave of fresh seed swelled inside them, pounding on the walls of his orbs as they forced his aching testes to swell further, their shape having shifted from tight little spheres to pendulous, oblong wrecking balls.

As he massaged his sperm factories, his sheath began to shift. The fur shed from its skin as his manhood began to emerge, skin shifting and toughening as the tight network of small blood vessels that formerly gave his prick it's fire-hydrant-red appearance merged to form larger, more pronounced veins that criss-crossed his member's surface.

As his knot faded, a fat, sensitive ring formed halfway up the shaft. As it reached full hardness, his dick strained as it expanded further. The rest of the shaft was moving faster than the tip, which began to flatten as it gained a series of ridges. He moved his hands to massage his shaft, stroking it as it lengthened, rubbing his paw pads over the tip as his dick thickened to the size of a soda can.

Luka moaned as his balls lurched, feeling his urethra expand around a fat shot of precum that traveled up his now 2 foot schlong, head flaring as it reached the top and fired out, pooling on the rim before dripping down his length and soaking into the skin of his sheath and sack.

As pre streamed out of his flaring head, Luka could smell the potent musk exuding from his equipment, as his fluids steamed off his roiling balls and sweaty sheath, filling the room with the scent of a virile stud.

While he had been preoccupied with his dick, his balls had continued to grow between his thighs, approaching the size of coconuts as he had to spread his legs to accommodate their virile expanse. They continued to pump hormones into his system, aching and churning as more and more seed bubbled within them, sloshing with their virile contents as they bobbed between his legs.

With a flare of heat, even more pre shot from his dick as the liters of canine cum that had been brewing in his balls boiled as it mutated into pure, potent horse cum, completing his transformation into a Canine-Equine hybrid. As his now completely equine equipment settled into its final form, Luka felt a particularly strong dose of horsey hormones dump into his brain as he felt the heat of rut suffuse his system, muscles swelling as his body and mind shifted to make him an optimal breeder. Pre pooled at his feet as he pulled his dick to his muzzle and shoved the flared head inside. The salty lube streaming from it drove him wild as he began to thrust, rutting his mouth.

He dropped one paw to massage his aching orbs as the other stroked his length, working himself to orgasm out of a desperate need to release.

As he felt his orgasm approaching, his flare expanded further, his urethra pursed shut, and his balls hitched between his legs as the pressure built within him, until, with a final, deep thrust, it released.

In an instant, his muzzle was filled. As he struggled to swallow the first massive shot, the pressure of the second forced his dick from his mouth. He groaned involuntarily as his sensitive head brushed his fangs, his potent, yellowed stallion cum blasting all over him and his kitchen as his dick flew out of his mouth and bobbed in front of him, bouncing as it fired the liters of seed that had been bubbling inside his balls. He continued stroking his shaft, mind working on autopilot as his thoughts blanked with the pleasure emanating from his crotch, musky cum soaking into his fur and filling the room with his new, powerful scent.

As his orgasm tapered off, seed continued to drool from his tool as Luka slumped to the floor, having experienced the longest and most intense orgasm of his life. Already he could feel a fresh load churning in his balls, the deep ache that pervaded through them rapidly returning.

As his thoughts returned, felt new instincts coursing through his brain, demanding that he find a mare and fill her with his seed so he could sire many foals, his mind filled with images of winking pussies and massive, straining clits begging to be serviced by a slab of stallion meat.

His dick, which had almost retreated into his sheath, began to rise once again, pulsing as pre began to stream from it once again, head flaring with lust as he fell asleep to dreams about a harem of mares, all eager to be bred by him and his powerful equipment.

His sleep was interrupted by a knock at his door. He'd cum again in his sleep, leaving a puddle of seed on the floor around him and even more soaking into his fur. His dick had retreated into his sheath, but pre continued to leak from his sheath as his balls throbbed, between his legs, his rut beginning to return once more as he got up, feeling the contents of his heavy sack slosh as his balls bounced between his thighs while he walked to the door.

When he opened the door, he spotted his Cabbit friend, who started to speak, but his words tapered off as he was hit by a wave of powerful, hormone-filled musk that radiated from Luka and his apartment.

Dazed, he stumbled in and sat down, almost hypnotized by the smell of the dog-stallion's rut. Luka walked over to Slick and shoved his nose into the folds of his sheath, giving him a dose straight from the source. The musk streaming from it was incredibly potent, juices soaking into the fur of his muzzle as Slick moaned into his crotch, the vibrations of his voice stimulating Luka's balls to deliver a particularly strong blast of pre as Slick began to involuntarily lap at the juices that had been fermenting in his sheath, his conscious thoughts fading as he began to crave nothing more than to be seeded by the virile hybrid.

Luka could see the outline of Slick's dick in his pants, and reached down to rub it as his awakening shaft pushed Slick's muzzle from his sheath.

As he pulled away, Luka could see that Slick was completely under his spell, hypnotized by the concentrated musk from his sheath. He gave the cabbit a simple command, "Suck," and watched with bemusement as his friend scrabbled to immediately shove his cock into his muzzle, eager to please his master.

As he sampled more musky pre straight from the source, his own dick fired off in his pants, soaking them with his own seed.

As he came, his thoughts shifted. He needed to serve his master, and his master was in rut. He needed someone to breed, and his twisted mind demanded that he be that someone.

Unbeknownst to either of them, Luka's pre was laced with some of the transformative compounds from the energy drink, and as his mind demanded he be a perfect breeding bitch for the Shepherd-Stallion hybrid, his body shifted to match. Just as his orgasm seemed to be tapering off, it started once again, a fresh slug of cum pumping from his dick every time he pumped his muzzle up and down Luka's shaft. His balls began deflating as his body emptied him of all his seed, preparing him to be nothing but a depository for the seed of others.

The cabbit's sack melted into his crotch as he fired his final shot of cum, a slit forming between his thighs as his dick retreated. As it settled into place as a thrumming clit, Slick moaned around Luka's dick, feeling what was left of her balls burrowing deep into her as warmth blossomed within her new womb, her testes-turned-ovaries settling into place between her widening hips. Her chest swelled as her expanding nipples were carried forth by growing breasts that bounced as she ravaged Luka's rod. She grasped a breast with one paw, rubbing a newly sensitive nipple and moaning as her other lowered between her swelling thighs to help with the growing need between her legs.

With a blaze of lust that exploded within her, Slick went into heat. Her pussy clenched and winked as her clit swelled, spreading her lips wide as femlube gushed from her opening, her womb aching almost painfully with need as it demanded she be seeded. Her pussy winked with need like a mare's as her body screamed internally with need. Luka's nose, still as sensitive as ever, could smell the scent of her estrus and commanded his now female companion to bend over.

Slick eagerly complied, unable to resist even if she'd wanted to, as both friends surrendered to their instincts.

Luka lined up his shaft and speared into Slick. Her slit fluttered around him as her body rewarded her for finding a mate as Luka pushed deeper into her tunnel. She could feel his pre splashing against her cervix and seeping into her womb, a pervasive warmth spreading through her.

Luka's dick flared as he finally hilted himself inside Slick, her pussy spasming as a mixture of her fluids and his, displaced by his massive length, sprayed out of her and onto his sheath, adding the scent of sex to the saturated musk that wafted from it already. When he pulled back, Slick cried and shivered in pleasure as his thick medial ring passed over her swollen clit, her cries becoming screams of lust as Luka began to rut her eagerly.

Every time he pulled out, his thick flare stimulated her g spot, pulling their fluids with it as more flooded from both into her tunnel to replace them. When he thrust back in, her pussy sprayed more out as all the room inside her was taken up by Luka's cock, his balls sloshing as they slung forward and smashed into her clit, churning with more and more cum as they throbbed between his thighs, stimulated with every swinging thrust.

As they worked overtime to produce his biblical load, cum began to contaminate his pre, and Slick's womb screaming with joy as it felt his swimmers invade, inflaming her heat as her body demanded to be properly seeded, unsatisfied with just a taste of what was to come.

Slick moaned as her mind shifted permanently into her new purpose as Luka's breeding bitch just as Luka's was cemented as a breeder, their hybridized anatomies perfectly suited for each other as they worked towards their mutual orgasm.

As Luka made one final thrust, grabbing Slick's hips and shoving her down onto him, his head flared wider than it ever had before, balls winching themselves tight to his crotch as his cockslit pursed shut.

Slick could sense the pressure inside her as his flare sealed her passage, Luka's cock thickening around the massive slug of cum being pumped through it.

She could feel her cervix being spread open by his flare as it reached the head, cumming instantly as it speared directly into her fertile womb.

Her arms failed her and she fell onto her breasts, her pussy convulsing violently around Luka's immense shaft as it fired shot after shot deep inside her. Her belly swelled with seed as backwash sprayed out of her, soaking Luka's sheath and balls, staining them permanently with the scent of their breeding.

Her breasts swelled and began to leak milk as proof of a successful seeding, spraying with every wave of her powerful orgasm as both their minds were boiled by pleasure, rewarding them for fulfilling their new duties.

As they came back down to Earth, Luka collapsed on top of Slick, the pressure of his weight forcing a particularly strong blast of milk out of her aching breasts. He rolled off her, dick pulling out of her gaping pussy as both of them moaned with this last burst of pleasurable friction. Cum and feminine fluids gushed out of Slick's well used hole, as the remnants of Luka's orgasm were pushed out as his cock retreated into his sheath once more, already leaking with a fresh stream of pre as both of them fell into the arms of a post-breeding sleep.

When she awoke hours later, Slick found herself in a pool of milk, cum, and the femlube that now drooled continuously from her slit. Examining her new body gave her a thrill and stimulated a spurt of juice from her pussy and a spray of milk from her heavy breasts. The needy heat inside her had faded to a warm and pleasant glow, but she could already feel it returning as her womb demanded to be full. As she lowered a paw to finger her slit, her instincts told her she'd never again have relief.

Luka stirred beside her as he once again awoke to the feeling of blue balls, his testes aching as they churned with the massive load rampaging within them. The stream of pre drooling from his sheath ramped up again as he felt the heat of equine hormones pumping through his system once more, pheromones steaming from his musky junk as his body and mind prepared to breed once more.

Slick took in a deep breath, her heat flaring up as her ovaries dumped a bomb of hormones into her own system, breasts straining with more milk as she felt her pussy start to wink again with need, her swollen clit rubbing sensitively against her lips, which drooled onto her thighs as she stalked over to Luka, both of them looking at each other with nothing but lust behind their eyes.

By the time she reached him, his dick was lubed and ready once more, and Slick eagerly jumped into his lap, both of them slaves to the endless fires of their lust.