It had been a long workweek.

The couch buckled under the weight, as a green and white cream furred puppy flumped onto it with a controller in his hand. That typically happened. Less so because of use, and more so because Isy was quite heavy. Beyond being two meters tall, his body was quite athletic, his blue work shirt unbuttoned to show off his pecs and abs, along with some sizable muscle to his biceps and shoulders. 

All this plus the lack of pants showing off a sheath half the size of his head and cream furred balls that swung against his thighs would make him quite imposing. If not for the fact that his face was utterly adorable: a cute black button nose on the end of his snout, golden eyes with a shine to them, bushy red eyebrows and a fiery mark between the brows, and his small canine ears. His choice of activity to wind down the workweek was also disarming as he turned on the TV: Yoshi’s Island for the SNES. He smiled wide as he wiggled his feet, ready to put many hours into one of his favorite games until he was done with the day.

What he didn’t know was that he wasn’t alone. 

As Isy picked up where he left off, a bunny in silhouette slowly made his way through the kitchen nearby, step by step towards the canine on the couch. The lagomorph wasn’t particularly quiet, rumbling the ground a little with each step, but Isy was paying too much attention to the game, having picked back up on a difficult part of the late sections of the game. Isy’s face was tense, moving a dinosaur and his baby carefully from platform to platform, while the bunny got closer and closer. Isy was nearly at the end, the Goal Ring was nearby… Only a few meters away, just like the bunny.

He made it! Isy jumped up to cheer as his big paws hit the ground, making the ground crack and shake (his muscle was quite dense). Now was the time! “WOOO–GUHHHH” He had made it to his feet only to be pounced by the bunny, smooshing right back against the couch as he was surprised by the weight. Glass on the nearby counter nearly shook from the rumble between the two as the ground cracked more.

Isy shook his head while leaning against the couch pillows, looking at the face of a white furred bunny with blue inner ears he recognized well. Basil, one of his best friends, with his blue eyes, pink button nose, silvery hair, and cute buck tooth. But he looked a lot different than Isy remembered. For one, the puppy was used to looking down at the bun, but Basil was nearly as tall as him now. The bun’s more feminine bare chest had turned into big pecs, arms as thick and wide as the puppy’s own, and Isy could feel his friend’s sheath bumping against his own. The only thing that looked the same besides Basil’s cute face was the adorable bushy tail between his booty cheeks, each buttcheek as big and wide as a doorway, with a massive fat, rubbery blue donut widening them further.

He didn’t have time to think about it for long. Basil wrapped his muscled white arms around the puppy to hug him tight, making him gasp and drop the controller, while the bun gave him a hugeeee kiss. The canine was flustered. Basil didn’t usually come on this strong. Not that he minded, the tip of his red rocket poking a little out of his cream sheath. But the bunny wasn’t close to done as Basil moved to kiss and grope all around Isy, starting with the puppy’s arms and chest. 

That’s when Isy felt it. A tingling sensation from where Basil smooched.

His pecs were first. The cream muscle below his neck started to expand, pushing out and flexing with veins, growing bigger than his head. His deltoids grew along with back muscle, broadening his shoulders as the veins from his pecs joined the ones from his arms. Basil smooched lower and lower, while Isy’s lats pushed out, obliques thickening as his torso ballooned. His biceps and triceps flattened as his body rippled with muscle. The couch strained, pushing further against the ground with each second as cracks started to form in the furniture.

And it felt goooood. 

More of Isy’s cock started to show through his cream sheath as it pushed against the bunny’s pecs. The perfect opportunity for the bunny to smooch his sheath too, rubbing around the canine’s crotch. Isy started to pant with his big pink tongue at the sensation, as his sheath grew out, thicker and heavier while his balls swelled closer towards the ground. The sensation doubled, like something more was coming.

Literally more. Next to his cream sheath grew a bump, before another sheath grew out to match. Just as thick, big, and heavy. Isy could feel his cocks stirring between the new sheath, while his old one eventually released most of his cock to smack against the bun’s face. It didn’t even faze Basil as he continued to kiss all over the puppy’s erect cock, his hands exploring all across it, from the tip to the knot at the base. Isy wiggled as his new sheath pulled back to show its own canine cock, both rubbing against the bunny as Basil grabbed onto both cocks.

Isy looked down, continuing to pant from the pleasure, to see that Basil was changing too. The bunny’s shoulders had turned into mountains around him, pecs growing past his head to rub against the base of the puppy’s cocks. His arms were just as veiny as the puppy’s own, just as full of strength.

The whole display and tingling really got under the puppy’s collar, his balls growing towards the ground as they filled with cum. He felt so pent up as he jerked and humped against the bunny, only to feel more tight sensations around his crotch. Isy nearly came when his canine cocks grew twice as big with a BWOOMPH, longer and thicker to tower over the bun’s head. 

He had a tough time not cumming when his sheath rumbled the whole floor, balls growing to smoosh against the ground, only to reveal more cocks from that thick furry purse. Three, four, five… Isy was too lost in the growth to count, as many cocks joined their siblings in size to smoosh against the bunny. Spilling out in multiples, growing out as they throbbed, thick knots at their base as each one rubbed against Basil’s pecs, shoulders, face. It was like a forest of cocks that started to bend around him. 

Isy knew the bunny was growing with him, too, but it took a minute before he saw the bunny’s own cocks spilling out erect and towards his chest. Not blue like the bun’s usual, but black, with a fluted head. Horse cocks, with medial rings marking them as they grew up and closer to the puppy’s head. They were thick, meaty, and heavy against Isy’s abdominals and chest. 

The foundation of the building was not happy with the growth, but the couch was first. By the time the puppy’s pecs were twice as big as his own head, the furniture sighed before crumpling. Isy fell backward for his shoulders to, well, shoulder the fall, smashing against the wall as it barely held together, while the puppy braced himself with four arms. F…four arms? He had four arms now, each as thick with cream muscle. The perfect amount of arms to start dealing with the many horse cocks pushing against Isy’s chest and now approaching his collarbone. He licked at the heads while his arms grabbed onto each spire and started rubbing. Up, down, up, down.

The TV and controller were forgotten as the bunny and puppy filled up the room. Meaty pecs bigger than beach balls with shoulders nearly as broad rubbed against tens of horse cocks that bent up and around the ceiling. Isy’s own red rockets were plentiful, having grown multiple sheaths for more cocks to now rub against the ceilings, walls, and Basil himself. They were up against the bun’s chest, squishing against Basil’s butt or between his enormous cheeks to curl towards the ground, all veiny and begging to release gallons of cum. A few of them even poked at the bunny’s donut, looking for a hole to fill while the walls cracked and flexed cartoonishly to try to contain Isy’s red rockets. The heads of a few of them even left through the windows to spurt pre onto the lawn. 

If the neighbors didn’t catch on from that sight, they caught on from the noise of the ground rumbling. Beyond the massive cocks of the growing pair rumbling and creaking the walls (and the smooching of a bunny that hadn’t stopped along with a cute green puppy’s panting), there was also the many sets of balls that Isy had now grown that was propelling them up. Each orb was half as big as the couch, rumbling with pool-filling servings of cum that Isy desperately needed to unload. It was so claustrophobic, so pleasurable, and so good. He needed release badly.

Basil moved himself back up between the many red rockets to go up to Isy’s face past his enormous cream pecs, seeing his best friend pant as the bun gave ear scritches behind the puppy’s green ears. The bun’s mouth widened in a smile to show off his buck tooth. “Did you like the surprise? I thought you needed some release, so I thought growing you was the perfect way to–”

CRACKKKKKKK GROANNNNNNNNN

KRSHHHHHHHHHHHHHHHHHHHHH

	The bunny’s eyes widened as the walls of the house broke apart. They had gotten uncontainable, as multiple horse cocks and red canine cocks smacked against the lawn to crawl towards the neighbors’ houses. Pre gushed onto walls and other buildings while balls decompressed to grow out heavier, swelling towards the ceiling as they rumbled behind each fur’s legs, cracking the ground further.

“Um… I may have gotten…. Carried away…” Isy loosened his four-armed grip on the bun’s horse cocks as Basil swiveled to survey the damage, his back and massive butt facing the puppy. Isy’s eyes bulged seeing the massive hole between Basil’s cheeks had only gotten bigger, big fleshy donut enough to swallow Isy’s own head if he wanted. The perfect size for a donut that was begging for a filling. Isy moved his tongue to the side as he carefully sized up his mark. He held multiple of his red rockets between his arms, like he was an archer aiming at a target.

Basil grimaced, oblivious to what was going on behind him. This was a lot of damage. He might have to make a few phone calls and–

Isy aimed true with one, big HUMP.

“MMMFMFMFFFFFFF”

The bun’s stomach bulged with multiple canine cocks, at least ten of them having shoved through his fat donut through his ginormous cheeks, spreading him with one heavy move while a few enormous balls smacked against him. Basil gulped as he heard the loudest rumbling he’d ever heard behind his tall bunny ears, balls pent up with hundreds of tons of seed. His friend was still growing too, balls swelling towards the sky as the cocks already inside him pushed out more and more. All while the bun heard cute chuckling from his friend. 

“Basil, you growth slut. Let me show you exactly how much I enjoyed your surprise~.”

It was gonna be a long weekend.