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Wawik and Kay weren't sure what was happening. One moment they were filling out forms in the lab's test subject waiting area. Next they both were left to be observed in some sort of 'shower' room. Kay and Wawik had vague recollections of being injected with something...but now they only had one thing on their mind. SEX.

Wawik took a big wad of precum and got his thick jackal dick nice and slick. He put one paw on the tiger's hip, while using his other to guide the tip of his fat, long meaty cock up against the tight pucker of Kay's hungry hole. At first it resisted, but slowly it gave way to the first inch of Wawik's cock. Slowy, Wawik started to guide his shaft into Kay. He grinned as the tiger pants and moans at every inch Wawik pushed into Kay.

Kay tensed up briefly as that meaty cock sinks between his plump bubbled cheeks. The tiger raked his claws over the wet tiles, his moans growing slightly higher pitched as Wawik grips Kay's rounded hips and sinks deep into the feline's snug ring, spreading that heated tunnel with his delicious girth. Kay was rewarded with even more panting and moaning, his toes curling in as his plump and meaty cock slaps hard against his soft flat belly.

Wawik slides in deeper as he feels Kay's insides clamp down on his thick rod. He works it in and out, going deeper into Kay with each thrust. 4", 8", 10", and then finally inch 12 squeezes its girth into the tiger's tight boy hole. Wawik can feel Kay's insides pulse against his thick shaft. His moans fire the canine up as he slams deep into the tiger's rump. Kay's supple ass cheeks clap against Wawik's muscled thighs. "Mmm, do you like that stud?" the Jackal growls.

Kay closed his eyes, his chest pressing up into the smooth tiles, the air growing so deliciously humid as he grows hotter and hotter, the steam swirling so thickly through the air. Each inch earns a heavy moan and a powerful lurch of his plump cock, Wawik's girth spreading him so deliciously wide and tight that it's a fight to not cum right then and there. When at last Wawik hilted Kay arched his back to offer his supple booty up even more, the cheeks rippling firmly as they begin to slap wet and loud off the Jackal's strong and thick thighs. "Harder!" is all the tiger can practically yowl in response, his insides pulsing powerfully and hungrily around your incredible dick. His injection flowed through is veins, making his stripped tiger fur burn hot.

Driven by Kay's moaning, and the feel of both globes of Kay's ass slamming back into his hips, Wawik bucks and thrusts harder. He bends his legs a little so he can get more power into pouding Kay's supple ass. He listened to the clapping sound, and moaned with pleasure "Oh Kay, you're so fucking tight! And hot! I can feel your insides grabbing my dick". Wawik puts one paw on Kay's shoulder, and reaches around and puts his other paw on his belly.

Kay is pushed up to his tiptoes, the shorter fur pressing his cheek and chest to the tiled wall so that Wawik can slam as hard and deep into his overbubbled ass as he possibly could. His claws rake wildly over the wet wall as Wawik's strong paw grips Kays shoulder, the other holding his smooth soft belly, which, strangely enough, makes his cock slap and leak more vigorously than ever. Kay's ass is clenching tighter and tighter, his cries splitting the air sharply as Wawik pounds Kay's juicy ass relentlessly, his balls are already drawing up tight.

"Yeah, moan sexy. Does my cock feel good deep inside you?" Wawik leans in to whisper this in Kay's twitching ear, afterwards he nibbles on it playfully. He takes his paw off Kay's shoulder and slides it down his back, then around to his front, so both paws are on Kay's belly. Wawik flexes his big thighs and slams into Kay faster, using his paws to help pull Kay onto his cock. "I want to fill every inch of you."

"Ohhh FUCK..." the hot tiger whimpers out heavily, his normal voice higher pitched as Wawik plows in and out of Kay's ass, those wet slapping sounds growing louder and louder, steaming water pouring down Kay's back and cascading off the plump shelf of his booty. Kay's cock is aching, swollen thicker than ever from sheer over-arousal. His belly ripples under Wawik's strong paws as Kay thrusts back into the canine's powerful thrusts, helping Kay cram every inch of dick into his straining body as possible.

The wet slapping sounds increases speed and Wawik picks up the pace. "Oh Kay, you're so hot. I love your ass!" Wawik thrusts hard into him while the tiger pushes back. Kay's belly ripples and feels warm under Wawik's paws. He rubs the feline's belly curiously

Kay grits his teeth, shuddering and panting, his breath coming in shorter and more ragged gasps as Wawik pounds his ass hard, deep, and fast. That bare dick sinking in and out of his tight ass almost achingly, his big ass cheeks growing almost achingly tender from the repeated impacts. The tiger's belly tenses up with the rest of him as he suddenly roars out, his plump cock jerking suddenly before thick ropes of cum begin to erupt from his spasming dick, the tiger's ass clenching and pulsing powerfully and hungrily around the Jackal's own big dick.

Wawik pants and moans as he feels Kay cum beneath him. Kay's dick spams against his paws. The tiger's belly feels warm, and starts to rumble under Wawik's paws. He thrusts so hard into Kay as the feline's tight hot tunnel engulfs his dick. Kay's ass feels so much softer after repeated poundings. His belly loosening up from being tight after cumming.

Kay whimpers as his belly feels intensely warm, rumbling strangely as it begins to soften up. His thick load paints the wall in front of him. The tiger isn't even allowed to slump in exhaustion after his intense climax, his cock remaining achingly hard but dry as Wawik's strong dick continues to slam into him. The tiger still breathlessly moaning out long and hard.

Wawik pants as he humps Kay's perfect ass, pulling his shaft almost all the way out with each thrust. His fingers rubbing into Kay's softening belly, the ripples spreading out warmly. "Mmm, what's happening here..." Wawik asks, but not stopping the pistoning movements of his hard cock. His own dick was growing hot, his balls churning hard. He could feel his knot starting to engorge.

Kay grits his teeth, his belly rumbling louder, growing hotter, those ripples spreading, as his belly feels softer and softer. "Gods... I don't know... but it feels so good..." the oversexed tiger whimpers sultrily in response. He seemed to be getting his second wind, his thick, shapely thighs flexing against his matted, wet fur as he slams his ass back hard against Wawik. His big round ass rippling hard against the jackal's thighs as his ass greedily milks each inch of studcock that slams into him.

Wawik breathes heavily, moaning happily. "Ooh, it feels like your belly is getting bigger stud." He rubs his paws across Kay's warm stomach. His dick aches with a need to pump deep and hard into the growing tiger. What ever the guys in white coat's shot into him was starting to take over.

Kay clenches powerfully around Wawik's cock at those words, his own shaft suddenly flexing harder than ever, those words sending a strange, electrical thrill of pleasure through him. "That... ngghhh... can't be possible..." he whimpers as he continues to ride that cock, his belly rippling and softening still.

The feel of Kay clenching on his rod makes Wawik moan loud. He pumps more, wet slapping sounds smacking from out of the steam. "I think it is growing stud. I can feel it pushing against my paws. It's fucking turning me on!"

The tiger can't remove his paws from the wall, but he's becoming more and more aware of the heavy rumbling in his belly, the heat that seams to continually rise, and the way it's pushing out against Wawik's paw more than it should. "Ohhhh fuuuuck... why is that sooooo hoooot..." the poor tiger whines, his cock achingly rigid, slapping against the jackal's paws as Kay rides the canine's cock harder than ever, pushing Kay's belly into his wet and strong paws.

Wawik rubs Kay's belly feeling it grow a little bit more with each thrust. "Your belly feels soooo good. It's growing in my paws. I can't stop myself!" Wawik fucks you hard and fast. He can feel his blood rushing faster through his perked up ears. His need to fuck...to rut...to breed shot out of control.

The tiger can now definitely feel his belly grow rounder each time Wawik's thighs slap hard into his big plump ass cheeks. The tenderized globes feeling swollen from the long and hard fuck. "Gonna... cum... again..." the tiger hisses through his tightly grit teeth as Wawik begins pounding him harder than ever, his belly growing rounder and fuller as he squeals, his cock jetting weakly as he hits a second orgasm, his ass clenching powerfully and needily around the canine's pistoning dick.

"Oh yeah baby, cum for me" Wawik says as he humps Kay long and hard. His paws rub across the growing round belly, feeling it grow bigger, and heavier. The swelling round shape pushing his paws apart. "uuhhhhhh.....so tight....and you're getting more round!"

"M-mooooore..." the oversexed tiger whimpers between his teeth as his second orgasm crashes down on him, his senses heightened intensely as the powerful pleasure seems to rush through every single inch of his body. His back arches more and more as his belly rounds outwards, growing heavier and heavier, fuller and thicker, spreading Wawik's paws and fingers steadily apart. Kay looked way past 9 months pregnant...and it just kept growing!

"MMmhhh...I'm gonna give you so much. I want to make you so much bigger." Wawik slaps quickly into Kay's tender ass-cheeks and thighs. He can't keep his paws off his expanding belly, feeling it grow bigger and tight. "I feel something moving!" The jackal wasn't sure what had gotten into him, but he had a burning need to fuck it out!

"Fill mmmeeeee... stud..." Kay hisses as he begins to come down from that incredible second climax, the weight of his growing belly making his back bow out into a more noticeable arch, which only makes his big round ass ripe for the fucking. He finally pulls a paw from the wall to reach down and rub his belly alongside Wawik's paws, whimpering heatedly as he feels it swell and grow, tightening as it mounds outwards, his cock refusing to soften as it begin to bounce against the growing curve. His belly was getting bigger by the second. He looked heavy with a set of triplets!

"Unnnnhh...Grow for me bitch! I want you to get huge!" Wawik pulls Kay upright, rubbing his chest up and down Kay's back. His paws help to hold up Kay's quickly swelling belly. The tiger's body looks perfect as it grows fuller and heavier, pregnant with quintuplets. "You're such a hot preggy tiger," Wawik says as he fingers Kay's popping belly button.

Kay leans back heavily against Wawik, finally able to look down and stare in lusty awe at his still growing belly. His gut almost seems to respond to Wawik's words, rippling powerfully as it grows ever faster, the orange-white fur growing tighter and tighter, his navel growing shallow and tight before beginning to pop outwards. His paws clutch at Wawik's to hold his swelling belly tightly, his ass still grinding back hard into the canine's hips and thighs. "Soooo fucking hot..." Kay whimpers, swelling large with 6 jackal pups.

"Oh yes baby, ride my dick. Grow bigger for me, I want you nice as knocked up!" Wawik feels Kay grow, and it drives him wild. His balls and dick yearning for release. The heavy expanding weight of Kay's belly swells a little faster. Kay's fur gets tight, and his belly button is a now an outie. "I can feel them kicking." Kay moan's as Wawik rubs a spot on the tiger's gravid belly.

Kay can hardly breathe being so insanely overwhelmed with the pleasure and the growing pressure of his belly. It's so rounded, so deliciously taut, and hot to the touch. The pups growing in his belly are growing active, ripples begin to travel the tightening curve, making him slap against Wawik's thighs as hard as he can manage. His belly swells steadily now, picking up the pace as though it was matching the Jackal's desires.

Wawik rubs Kay's belly sensually, whispering into his ear "You feel so fucking amazing. You look so good knocked up!" Wawik fucks Kay deeper and harder, willing him to grow bigger. His dick feels thick and full with a huge load forming deep inside him. "I'm feeling Octoplets now. Feel them grow inside you." Wawik moves his head to nip delicately at the tiger's neck.

Kay lifts his chin to bare his tender neck fully to Wawik, his fingers twined around Wawik's as he squeezes and gropes his belly. It's still swelling, still bloating outwards, the pups beginning to kick and squirm as his brood grows steadily, his belly a perfect bulging mass growing so sexily from underneath his toned chest.

Wawik bites gently down onto the tiger's tender neck, his tongue licking at the wet fur. "You're getting heavier, feels like you've got quite a brood in there." Wawik says leaning up from Kay neck. "It feels like you're about to get even bigger!" Wawik's dick strains to keep from blowing his load deep into this preggy boi's tender, oversexed ass. "I'm gonna cum!"

Kay is steadily finding it harder and harder to keep up with the ruthless pace of slamming back down around Wawik's cock as his belly swells heavier and heavier, his toes curling in, fingers clutching at his dripping wet belly. "Fill me to bursting stud.." he teasingly moans out for Wawik to hear.

"Ooohh, I can't take much more...oh gods...here it comes!" Wawik moans loudly as he bucks into Kay, his belly feeling so big and heavy, little kicks from puppy feet tapping into both their paws. "Oh Kay!" Wawik moans and pops his bulging knot into Kay's tight ring. The circle of muscle engulfs it all as the canine ties. Wawik can feel his knot bulge large and large until it was clear he wasn't going anywhere. With that the flood gates opened, wave after wave of hot seed gushed into the tiger's hole. As if in response Kay's belly swells suddenly the wave of growth picking up speed!

Kay tenses up, pressing back heavily as he feels an impossible third climax rush through his body as his belly ripples with life and fullness. Wawik's cock thickening as it erupts and floods Kay's hungry tunnel with wave after wave of cum. His belly swelling rapidly damn near creaking with fullness. But it didn't stop. Kay yowled out and leaned hard against the wall as his belly surged in size, drooping lower. Soon he was big enough for 10 pups...then 12! With a moan Kay felt something in his belly clench. It felt weird, then it happened again, but harder. The again, and again...harder and harder! He could feel a rush of hot water leaking around Wawik's huge knot. His belly contracted over and over. "Oh gods...I'm...I'm in labor!" Kay moaned. But Wawik was still firmly tied in place...and still cumming!

The Jackal howled as his orgasm gushed out of him. He had never cum so much in his life! What had the lab boys given him? Wawik growled and bucked deep into Kay's convulsing tunnel. With each wad of cum came a fresh jackal pup. 14...15...17! Each contraction clamped down hard on Wawik's knot, making him cum even harder which just added more pups to Kay's huge womb. Kay's belly was down to the floor now, he'd gotten so big.

"Nghh...getting...so big!" Kay panted, feeling his womb contract one second, only to be forced to grow the next. Kay pushed hard, but he just couldn't force that big knot free! He moaned hard as he swelled...18...21...23! Finally just when Kay couldn't hold any more a devastatingly massive contraction squeezed down hard on Wawik. With a wet pop and spray of birthing fluid the Jackal finally came free. Kay's eyes went wide as he roared out, feeling the pressure finally start to release. With some help from Wawik he made his way down to the floor, getting ready for his labor to really get going.

Kay looked up at the sexy Jackal standing over him, cum still dripping from the canine's rod. "Mmm, not bad stud." Kay purred, rubbing his belly as another contraction hit.

"Not bad for round one..." Wawik grinned. "Now push those pups out so we can have round two," he smirked.