Rolling over in the warm afternoon sunlight, Amon let out a contented sigh as the rays cast their soothing embrace over his lightly-clothed fur. His brother was out of the house at the store, so he had the entire place to himself, sunbathing and absent-mindedly stroking his crotch through his tight underwear. He turned to one side, his ballsack undulating with the four grapefruit-sized testicles inside as they shifted. Amon was only six years old, but already big enough to sometimes out-do his older brother, Anton, in terms of size. He was about to drift off to sleep again when he heard a fast knocking at the front door. Lazily, he picked himself up from underneath the front window, and plodded over to it to see who it might be. Being in his underwear, and too short to see through the peephole at the top of the door, he opened it gingerly, and craned his neck around to see who was there. To his relief, the porch was empty, and he was about to close the door when he noticed a small, nondescript brown package on the stoop. Amon looked one way, then the other, and seeing the coast was clear, darted out and grabbed it, rushing back inside and slamming the door shut behind him. The package didn’t have an address on it that he could see, just a pink tag attached with leopard print on it, which simply bore the words “For you, enjoy”. He shrugged, tearing off the brown paper, and opening the plain white box inside it. Nestled amongst a bed of cotton fluff, was a tiny, transparent glass bottle, itself bearing its own tag written in cursive script, that read “To grow, drink me”. It was filled with dark green liquid, and stopped up with a brown cork. He picked the bottle up, discarding the box onto the floor beside the front door. Going against everything he’d been told about staying away from strange liquids and drugs, his curiosity compelled him to open the bottle. 

Instantly his sensitive feline nostrils were overcome by a powerful, sickly sweet odour, which caused him to put the cork back in. Amon couldn’t get the smell out of his nose, and he soon found himself opening the bottle again, taking a deeper breath. It was intoxicating, and throwing caution to the wind, he opened his mouth, and downed the bottle. The green fluid left a mild burning sensation on his tongue, like that you would get from eating cinnamon hearts, and he smacked his lips, licking the remains of it from his mouth.  He instantly became worried, tossing the bottle into the open box and frowning, wondering why exactly he’d done something so silly. He didn’t have long to think about it, for his body suddenly became very hot, a feeling that began in his torso, and snaked outward to his limbs, congregating mostly in his groin, he noticed. Feeling a little woozy, he stumbled back into the living room where he’d been napping, and flopped onto his carefully arranged nest of pillows. He held his head in both hands as he lay on his back, struggling to get comfortable as his underwear seemed to be getting uncomfortably tight, and more so with each passing moment. Amon could hear the faint sound of cloth being torn, and he sat upright to find out what the matter was. Rubbing his eyes since he was uncertain of what he saw, he noticed that his balls appeared to have gotten…larger. Considerably so. So much so, in fact, that his balls had actually torn the fabric on the front right off without him even feeling it. He was only wearing the elastic around his waist, and his legs were still in the leg holes, but the front was completely gone. Making a rough estimate even through the shock of what he was seeing, he estimated each of his previously grapefruit-sized balls was at least double their original size. 

His skin was pulled taut over them, but it seemed to be keeping pace with the swelling orbs encased inside, and he felt no pain. It actually felt rather enjoyable, and soon his curious hands were running over his new dimensions.  He was lost in a haze, purring softly to himself as he spread his legs to accommodate his balls, which seemed to be taking on a life of their own.  He felt it hard to move after a few moments, sitting up halfway to see that his balls were each several feet around and still growing. “Myahh~” he panted, struggling to get up, and twisting himself around so that his swelling balls were behind him, and he was on all fours to allow them to expand to the rear. He stood up on wobbly legs, looking down at his crotch to see that his cocks were keeping pace with his testicles. Amon’s sheath was pushing out four softball-sized cockheads, each already seeping precum as they ventured forth into the warm sunlight still flowing into the room. Grinning dumbly, he began rubbing himself, his paws soon soaked in pre as his four cocks continued to push free of their fleshy prison, and slide onto the carpet, beginning to soak it as well. He wasn’t sure what to do with himself, the soothing feeling over him was like a haze, blurring his vision and lowering any inhibitions he could have possibly had, no matter how inconsequential. He just wanted to grow bigger, and the onslaught of his burgeoning balls didn’t even seem close to stopping. Amon could hear, but of course not see due to his immense size, furniture being upended behind him as his testicles progressed. Looking down with a dumb grin, he watched veins snaking across his four cocks as they slid sluggishly across the floor, rapidly developing into four, five, eventually six-foot-long totems of phallic glory in minutes. The feeling of such unbridled growth was almost too much, and he flopped forward onto his wondrous four-pack of meat, lapping and pawing at the flesh as all of them sprayed a torrent of precum across the room, the brief gush expelled with such force that the couch it hit was launched into the wall, leaving a considerable indentation. In some distant part of his mind, he wondered how he might explain the mess to whomever returned home to find him in this state, but at present he was too hot and bothered to care. He just wanted to grow, and go where the growth took him.

It seemed like hours had passed, but had Amon been in a more centered state of mind, he would have seen on the still-working yet cum-soaked clock near him that barely ten minutes had passed since he had quaffed the vial of liquid. His growth spree trundled on without stopping, his four balls each beyond  the size of washing machines, and the four cocks stretching now across the living room rug towards the other side of the room, more than eight feet long and every one of them measuring at least a foot wide. His sheath struggled to contain them, yet it appeared to still be able to keep paying out the seemingly endless length of dick that edged its way nearer and nearer to the opposite wall. Letting out a moan, he began rubbing his chest, beginning to notice a distinct soreness forming in his chest, particularly around his nipples, which began to warm considerably. As much as he tried to pry his hands away, he couldn’t help but continue to rub. Almost on cue, they seemed to be getting erect, but not just erect, they seemed to be…growing. Amon leaned backwards, away from his engorged shafts, leaning back onto his bountiful, fertile balls as they grew so large that they began to tower over his diminutive stature.  He looked down at his chest rubbing his eyes as he focused on his nipples, which both were becoming longer, thicker, and the tips were beginning to become wrinkly. Instinctively, his hands wrapped around both, and he began to jerk on them. They responded to the touch by pulsing larger, quickly becoming thick enough that his tiny hands were unable to grasp them entirely around their girth. His minute digits probed the ends of them instead, working over the wrinkled flesh hanging from their tips. There was moisture there, and when he probed further, he realized after several moments of digging that the wrinkled flesh was foreskin, and he was grasping two fresh cocks where his nipples had been previously. Precum leaked from from them over his paws, and he hungrily brought them to his mouth to taste it experimentally. It seemed somehow a little sweeter than that from his lower ones, and he bent one up to his mouth to get a better taste. He was greeted by another spurt of pre, which splatted all over his chest and down the front of his torso, creating a sticky river that traveled down his belly, and split into two separate trickles at his sheath. He could feel he was growing still yet, having by now displaced much of the furniture in the room, and become its sole fixture. It was when his immense, mountainous ballsack began to brush the ceiling that he came down slightly from his blissful cloud, and realized he was stuck. Quite utterly, in fact. Enough that his testes began to actually crack the plaster, and eventually started to push their way into the next floor, the material of the house’s construction oddly enough not slowing their progression in the least. His lower four cocks bumped up against the far wall opposite him, and met resistance there, as well. Like his titanic spheres, they too smashed through the house as well, pushing out much of the wall and forcing their way into the sunlight, as a germinating seed might force its way out of the inky depths of the ground to grow upward. 

The fact that the house didn’t simply collapse on him was a testament to its solid construction, even as his four monster orbs smashed their way into the second floor, and kept on swelling. Amon could feel water, so he supposed he had broken into the bathroom and dislodged the plumbing there.  By now, no doubt, the neighbours and passersby could see what was happening, and the thought of people seeing his shameful act should have embarrassed him, but instead it aroused him immensely. He WANTED people to see his tremendous length and girth, and to be in awe of what he was becoming. By this point, he could have put a blue whale to shame with his phallic totems, and he wanted everyone to know it. The pressure of the house on his dimensions, and the perverted fantasies in his mind, built up to such a fitful climax that he promptly began to ejaculate, profusely and powerfully enough that he caved in the side of the adjacent house, as well. His nipple cocks sprang to full erection that moment as well, discharging liters upon liters of warm goo in all directions as he convulsed with pleasure,  eyes rolling up into the back of his head as his inhumanly massive manhood, all six of them, doused nearly the entire first floor of his house and the next in his kitty cream. He wasn’t able to see the crowd forming outside that was watching him in a mixture of wonder and sheer terror, his cocks bursting from the side of the building like something from a 60’s science fiction drive-in movie, a creature from another world, bent on dominating the planet and subjugating its denizens. Anton, of course, was on his way back home when he noticed the commotion out front of home, and sprinted towards it. He wasn’t at all surprised at the sight he got when he opened the door, and took in the sight of the panting Amon frantically licking at himself, his cocks still shuddering and spraying cum. “Oh no!” he yelled, trying to get his younger brother’s attention.  “You ruined the place!” Anton could hear a giggle in reply, from his brother, wedged between those masses of cock and balls. “Yup,” said Amon, wriggling among the flesh. “Wanna help me wreck the rest of it?”