JB grumbled, tossing themselves onto the couch with a huff. Sure, they had the day off of school, but dad had left the snow leopard cub a list of chores to do that day, so what fun was that? Take out the trash? Boring! Clean your room? No thank you. Still, they thought, it needed to be done.. probably should just get it over with, then have the rest of the day to play video games or go outside, before their parents got home.

Trash was the first to go, that was easy enough. Then came cleaning the cub's room, shuffling around from place to place, moving and stacking things, stuffing them in the closet, getting their laundry ready for the wash too. In reality, it didn't take too long, but what kid actually likes to clean their room, or at least when they're told?

Once done, JB left their room, and while heading back to the living room noticed their parents' bedroom door was left open just a little. Curious, the snow leopard poked their muzzle in, peeking around, it wasn't like dad to leave the door open when he left for work for the day. Nothing seemed too out of place, the bed wasn't made, a few articles of clothing left around rather than in the laundry basket. With a snort, the cub giggled and slipped into the room, “Dad should take his own advice on cleaning your room, probably..” Though, there was something they didn't recognize, a little white plastic tub on the lion's nightstand.

Climbing up on the bed, they scooped the tub up in a paw out of curiosity, turning it over and reading the label, “K-9 Kreme, 'You dog you!' .. huh..” The packaging wasn't much to look at honestly, pretty plain, just a block print brand name, a little star with the slogan, and the logo, a bright red spaceship. “What is this stuff..? Let's see, 'CHANGE things up in the bedroom, with our patented formula, you too can enjoy the joys of canine cop-u-lation..' Hm, what else, oh, here's the instructions! '.. Just scoop some up and massage well into sheath and along penis. Lasts about eight hours. FOR ADULT USE ONLY' Hmmph.. I'm 12, that's totally grown-up, everyone says I'm hitting my growth spurt anyway..”

JB turned the tub over a few times in their paws, considering, curious.. More and more, curiosity ate at the little-big cat, they'd recently started exploring their body since growing older, so some of the concepts brought up by the product weren't exactly foreign to the cub. Unscrewing the lid, they were greeted with a slightly oily scent, but the stuff just looked like a bunch of petroleum jelly, nothing remarkable about it in the slightest. Curling their toes and fidgeting, the cat's paws hesitantly unbuttoned the fly on their pants, tugging them downwards.

By now their heart was starting to beat faster in nervous anticipation, breath quickened.. A shaky giggle escaped the big kitten's muzzle as paws tugged their underwear down too, brushing over a fluffy groin and modest sheath on their way back up the boyish cub's body. One paw traced back over their sheath, gently peeling it back an inch or so, the other scooping the tub back up, staring into its contents in quiet contemplation.

“O-okay.. if I do it now.. eight hours, dad'll be home, and no one has to know.. Just.. just do it, JB. No one has to find out.” They closed their eyes and swallowed a lump, before dipping three fingers into the thick salve in the container, scooping some out and bringing it to their lap, giving a little gasp at the touch of the stuff against their sheath, stirring at the contact. Slowly smearing the dollop of the curious product along their sheath, down over their balls, growing slowly aroused in the process. Sheath being pulled back fully from that hardening cathood, fingers continuing to work along fur and flesh alike, it tingled, and was starting to grow warm it seemed like.

A heavy snort of breath leaving JB's muzzle and they opened their eyes, head lifting up, staring down.. There it was, their absolutely ordinary maleness, slightly spiny tip hanging free of the sheath, shaft half-hard, and fur all matted and glistening with the jelly. But no changes, nothing was different at all. Maybe they really weren't as 'adult' as they thought. “Maybe I just didn't use enough.. a little more wouldn't hurt, dad probably wouldn't miss it.. Plus if nothing else, it does feel nice..” they thought aloud, scooping up a second helping, starting to smear it over their sheath and sac again, and back up over their cock, feeling it stiffen further, responding to touch and the warmth of the novelty product.

Head rolling back with a happy, contented sigh at the feelings, and eyes lidding down, JB missed the part where their flesh was starting to warp, the more stiff they grew, flesh filling with blood, growing a deeper pink, becoming reddish. It wasn't until they were a handful – and more, that the leopard opened their eyes, head lifting back up and looking themselves over with a startled growl, greeted with the sight of a swollen, too-big red cock. And with a flex of the shaft, they watched as it swelled, longer, thicker, it was still growing! “O-oh.. ohmygosh, it's working..! Mm-mmh.. feels so good too..” 

The cub watched in rapt fascination as their flesh twitched and throbbed, growing, slowly adding an inch of length, and thicker too, though not nearly so much. Tugging at the mutating length, and leaning their head in the other direction, watching the tip of the cock starting to reshape, their typical rough glans becoming smoother, truly migrating towards canine anatomy. There was more, though. They could feel an ache in their balls below, a feeling that was still very vague, only recently introduced to the cub in the past year or two. Dimly aware of the churning there, but far more aware of the feel of those two testicles swelling, stretching the sac, pressing out against the young one's thighs as they developed, occupying as much space as they could.

JB growled and grabbed at the bedsheets as their cock throbbed, that sensation wasn't new to them anymore, but the strength, the feel of need that came with it, took them by surprise. Left panting, they laid there, shaking and staring at the ceiling, feeling the stronger pulse racing through their shaft, and feeling the flesh continue to stretch, longer, thicker, making a proper handful for the cub. No longer was the flesh oily or slick with the cream, it was just hot, firm, bobbing with the excited cat's heartbeat.  And growing. Still growing. Shaking, the cub propped themselves up, staring down at their length, watching as it pulsed, inches definitely added for all dimensions.

There was more still though, the cub wriggling their rump into the bedsheets, so much aching, maybe the second application was a little too much? Fingers tracing down to their sheath, where the ache seemed to have settled, they noticed that the fur had changed; no longer a grey-white mix of the snow leopard's coat, it was more of a sandy blonde color everywhere the cream had been rubbed in. There was also a bulge swelling in the cat's canine sheath, “The knot, of course.. g-guess it works after all..!” They let out a nervous laugh, pawing down near the base of their shaft, feeling the bulbs grow in the sheath, fingers trying to peel it back and get a good look. More red flesh greeted the cub's eyes as that bulging swell came free, and they snarled at the sensitivity that came with even a testing squeeze, shaft flexing hard, almost sending the cat over the edge right away.

Fighting to catch their breath and hold on for a little longer, the cub took a break, just taking stock of their changes, trying to compare.. Where before they had been meager, but average for their age, the cat's canine length was now several inches longer, longer than the length of their paw even, and too thick for fingers to touch around tip to tip. And that knot.. They stared at the fat bulbs settled on both sides of the base of their shaft, fatter than the cat's thick paw balled into a fist. At the very least, a very male dog, even if not necessarily the biggest for .. whatever breed they were now sporting.

JB knew at this point though, that it would be a waste not to .. finish, what they had started. Starting to stroke again, panting and shaking, tensing up with little growls now and then, the snow leopard used both paws; partly to reach all the way around, and also to sometimes tease at that swollen knot, but knowing better than to squeeze unless they wanted it over in a hurry. “Over” would be soon though, they could feel their body tightening up, breaths getting quicker and shallow, the stroking growing in speed and intensity, squeezing now and then.

“Th.. this is it..” They muttered out loud, before holding their shaft in one paw, and squeezing the knot with the other, snarling out loud as they saw stars. Body falling back and arching hips up into the air, they felt that cock tremble and throb hard, a weak spurt or two arcing up into the air and splattering onto their belly, the meager capacity that the preteen had, purged in advance of what came next. Thick, fully formed gushes of semen showered over the cat, soaking down their shirt and into the fur below, as well as more errant shots guided off-mark by trembling hands and shaking body, landing in the sheets all around. 

Still, even with JB's changes, things were still finite, and the 'shower' was over all too soon. Though a different kind of shower may be in order, to clean their fur out, the cub thought. There was also a wetness between their legs they hadn't noticed before, so caught up in the moment of playing with their new canine shaft. Rolling out of bed, they wobbled a little, stumbling to the full length mirror, trying to check themselves out. Sure enough, the swollen canine length and its fuzzy sheath stood out from the cub's crotch like a sore, angry red thumb. A very long, thick thumb. Twisting and turning around, trying to investigate the wetness, they eventually bent over and peeked through their legs at the reflection in the mirror, panting and giggling at the sight they found. Not only had the snow leopard's shaft been mutated temporarily by the cream, but apparently some had spread or run down, giving the cat a thick, puffy Y-shaped vulva in place of their normally much less developed folds, the female canine counterpart to the much more prominent addition they now sported.

Slowly stripping their clothes and the bedsheets off to run through the laundry after they got a shower, the cub chuckled, “I should stay home from school more often.. do 'chores'.”