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Tyler stroked his cock absentmindedly, one paw clicking over the order form. The young mouse-boy felt stirrings of disgust at what he was thinking, but damn it, the ad sounded so enticing, the information backed up as well as could be expected under the circumstances:

SUPERSIZE YOUR PENIS!

EASY STEPS! ORDER NOW!

It promised the potion, and he couldn't really call feline "technology" anything else, would give him "the cock of his dreams." If it had been any other offer, he'd have rejected it out of paw. But the Cats...Cats were weird...

His paw hovered over the PayPal form that would send his savings account information whizzing through the air, and he hesitated. He glanced down past the slight paunch of cubhood he still retained to the infuriatingly small cock between his legs. But still...to use that weird, multi-meta-physic-trans-parallel-whatever-the-fuck-they-called-it the Cats had going for them...

He stared at his cock a little longer, rubbing it with two fingers, all he needed. All but unconsciously he clicked.

~~~~~

Jeff had been watching his older brother with suspicion. Tyler had been running out to check the mail every day, jumping up every time there was a knock or the doorbell rang. His twin, Henry, had noticed it as well, and they'd been swapping theories every night in bed together.

"Do you think he's ordering porn?" Henry asked as he fingered his twin. Jeff bit his lips, squirming, tugging on the scarf that tied his hands to the bed frame as his cock dripped pre steadily.

"I - unf! - I don't think so. T-toys, maybe?"

Henry shrugged and twisted his hand, starting to work his thumb in. "Not sure what kind of toys he'd have to order through the mail, though. Think you can take the whole thing this time?"

"I-I h-hope so," Jeff gasped as his twin began pushing steadily into him. Henry didn't pause, just kept pressing his hand inwards. As Henry's knuckles stretched his hole, he moaned, and managed. "S-something w-weird?"

Henry grinned and giggled as his Jeff's ass finally gave in and his hand slipped inside up to the wrist. As his twin's eyes rolled back he began squeezing his prostate, trying to wrap his hand around the little knot. "Weird sounds right. I guess we'll just have to wait and see!"

Jeff shuddered, cum pouring out of his cock in a steady stream as his twin milked him. "S-sure. W-wa-wait a-and s-see."

~~~~~

Tyler was jacking off, dreaming about how good it would feel to have to do it with both hands, when the doorbell rang. He jerked his pants up, and ran for the door as fast as possible. He made it to the bottom of the stairs before he saw one of his younger brothers out of the corner of his eye, and went sprawling as the brat tripped him. His hands smarting from catching himself, he heard the other twin answering the door brightly.

His face flaming, he looked up to see...Henry, maybe? Walking towards him with a plain brown package in his hands, grinning from ear to ear. "That's mine, brat."

The twin shrugged, tossing the package from hand to hand. "What is it? What's got you so jumpy, big bro?"

Tyler started to get up, when the other twin plunked down on his back. "Yeah, Ty, what's in the box?"

The older mouse squirmed, but his little brother had him pretty well pinned. "It's private!"

The twin holding the box giggled, and tugged away the tape holding it closed. "Oh, come on, brothers shouldn't have secrets. Henry and I don't, right Ree?"

Henry, apparently the twin on Tyler's back, bounced excitedly. "Nope! What'd he order?"

Jeff pulled the box open as Tyler yelled, "No!" and began giggling as he lifted out a little screw top jar and an instruction booklet.

"What, all that for some lube? Must be pretty special lube, big bro!" He let the box fall and tucked the jar under his arm as he opened the instruction book. His jaw dropped open as he read, eyes widening as he turned the pages rapidly, then he squee'd as Tyler let his forehead thump into the floor. Great. Just what he needed.

"Ree! Look at this!" Jeff shouted as he dropped down to sit on Tyler's back, pinning his arms. Tyler felt Henry let go, then heard him mutter in confusion. "So what?"

"Keep reading!"

Suddenly, they were both bouncing and squeeing on his back, knocking the wind out of him. He heard them whispering back and forth, squirming and bouncing on his back. Suddenly, they popped up off him and pulled him to his feet, giggling.

"What?" he managed to gasp out.

"You'll see!" the twins said at the same time, hauling him up the stairs. Tyler shuddered inwardly, furious at the twins, and not a little worried about what had them so excited. Especially when they dragged him into their bedroom, instead of his. One of them pushed him onto the bed, while the other pulled his shorts off.

"H-hey! What are you two doing!?" He scrambled to pull his shorts back up, but the twin pushing him onto the bed pulled him back and pinned his wrists.

The twin who'd pulled Tyler's shorts off shucked his own, sat down at his feet and began massaging and rubbing them against his growing hard-on. "Well, that stuff you ordered is pretty cool, and we know we embarrassed you. So we thought we'd help you out!"

Trey gulped as he felt his little brother's cock rubbing against the soles of his feet, fighting a losing battle his own hardon. He'd never played with his little brothers; they'd always been too bratty for his taste. Plenty of his friends had teased him over that, asking why he wouldn't want in on hot and cold running twins, but he honestly hadn't ever been able to make it past their attitudes. Still, they were definitely hot, and like most mice he was bi...

...but still... "How are you going to help me? I mean, it's a...uh...I mean, you just rub it on!"

The twin at his feet shook his head, grinning. "Nope! Jeff, you wanna read it to him?"

Jeff let go of Tyler's hands and picked up the little booklet that had come with the goop.

"'Increase your cock size! Five easy steps!'" Jeff giggled and turned little book towards Tyler, "It has little cartoon pictures with each step, see? 'Step One: don protective gloves!'" Jeff turned the page.

"'Step Two: apply goop to your little friend!'" Jeff turned the page again, and Tyler's jaw fell open.

"'Step Three: apply goop to the hole of your choice on your cock-to-be!'" Jeff turned the page once more, and Tyler's eyes began bugging out.

"'Step four: fuck your cock-to-be, rubbing the goop all over him or her, until your old cock bonds to your new cock!'"

Tyler was gasping for air now, cursing the Cats inwardly. Jeff turned to the page, eyes shining.

"'Step five: stroke your new cock's arms and legs, letting them absorb into your bigger, thicker shaft! If you desire your new cock to retain its face, stop rubbing for five minutes, or keep stroking 'til you cum for a total absorption! Either way, congratulations on your new cock!'"

Tyler licked his lips, eyes darting between his little brothers. "I didn't...the ad didn't--"

Jeff held up a hand. "But wait! There's more!" he shouted, in his best imitation of a cheesy TV announcer. He flipped the page, turning the book back to him. "'Warning: your new cock will still be a sentient person, parasitically attached to your body. You must feed your new cock once a week, or it will gradually shrink until you are left with a member the size of your old cock.'

"'Feeding is recommended immediately after absorption. Once initial absorption has taken place, your new cock will not return to its original form, and will always be your own, permanent cock. Aelurus Industries is not responsible for misuse or this product for non-consensual transformation. Mental analysis by a trained reader can determine consent. DO NOT MISUSE THIS PRODUCT.'"

Tyler jumped as he felt a little hand squishing goop onto his dick. His head whipped around to stare at Henry, his hands coated in a thick blue goop, rubbing his older brother's hard on with one hand, the other sliding into his ass. "Wha-?"

Henry smiled and licked his lips. "Jeffy can take more up the butt than I can. He likes it when I fist him. So we figure I'll go first, and get settled in. Then you can feed me Jeffy, and order another kit. Whenever he reforms, just shove him down into me until it's time to stuff me into him and get more cock."

Tyler heard a faint keening sound and realized it was him. "B-but...why do you two--"

Jeff laughed, and held a set of gloves out to his older brother, his own hands already covered. "Seriously? We get to spend the rest of our lives fused together into a cock, nothing to do but piss, cum, get hard, fuck people, and be filled with people who'll get turned into cum and be shot back out of us? That's the kinda life we'd love to have!"

Tyler shuddered, then yelped as he felt his cock slide into a warm ass. He turned slowly, licking his lips to see Henry sliding bouncing a little on his cock, rubbing his hands all over himself, smearing the goop everywhere. Jeff slid off the bed and kissed his twin, his hands dipping into the jar of goop and rubbing it on his shoulders and back. Tyler sat there, mouth working as he watched his twin brothers work to transform one of the into his cock, so he could vore the other. Jeff broke off his kiss and scooped up a glop of the goop and splatted it on Henry's back.

"Come on, big bro! The more you rub on him, the sooner he'll bond to you, the sooner I can get inside your new cock!"

He stared at his brother for a moment longer, watching his ass squish around his c...around his old cock. He could see the little hole starting to melt, could see the area around his old cock starting to soften. And most startlingly, he realized he could feel the little mouseboy's heartbeat synchronizing with his own, could feel him starting to throb in time with his old cock.

He moaned and began running his hands over his little brother's ass, spreading the goop over it and grinning as he watched his ass take on a blue sheen. The sheen spread all over the little mouse, as he rubbed his arms, his neck, and-

"Hey!" Tyler yelped. "Why are you rubbing your face? What if I want to see your head at the end of my dick?"

Henry licked his lips, pausing. "But we want to be a normal cock. We don't wanna talk, or see, or breathe, or eat. We're gonna be our big brother's great, big, sexy cock. OK?"

Tyler grinned and gave a hard thrust, drawing a moan from his new cock. "OK, then. Get rubbing!"

He drew back to give another thrust, and blinked when Henry moved with him. He glanced down at his groin, and let out a laugh of sheer delight at the sight of his little brother's ass joined to him, veins from his body already spreading up into the little boy's back past his tail. He licked his lips and started stroking the the tail into the veined area of Henry's back, gasping as he felt it merge with his little brother's back and become a thick vein in his cock. Jeff whispered, "Lay back, Ty."

When he did, Jeff began massaging Henry's legs and feet, pushing them up and pressing them into his stomach and chest. Henry and Tyler moaned together as Henry's legs stuck to his chest. As Tyler gasped and began frantically stroking Henry, Jeff pressed and moulded him, smoothing his thighs and calves into his torso, his feet framing his face.

Tyler grabbed Henry's wrists, feeling them squish like warm wax in his hands, and pressed them into the sides of his body, pressing his hands into his groin at the base of his newly forming cock, and watched at they disappeared into his flesh, becoming part of him as he smoothed them out.

Henry was gasping and moaning as he felt his whole body pulsing, quivering with pleasure. the hands all over him felt like every time he'd every masturbated times a thousand. "O-oh g-god...that f-feels s-so g-good..."

Jeff giggled and ran his hands up and down the underside of Henry, smooth and beautiful now, the blue fading away to leave dark pink flesh, mottled with veins, soft and tasty looking. He stood up to be eye to eye with the almost-formed cock, and whispered, "Just gotta do your head, Ree. Then I can climb inside you and get turned into cum for Ty to shoot out."

Henry managed a nod, and gulped. "H-hurry...I-I can feel m-my t-tummy rumbling, Jeffy...I-I t-think Ty's g-gonna c-cum s-soon..."

Jeff nodded, and reached up to cradle his twin's feet. He smeared blue goo over his ears, and smoothed them back into his head, watching the cute radar dishes vanish forever. He leaned forward and gave his brother a deep kiss, then sat back and smooshed his feet into the sides of his face, watching as his head flattened and flared out, his toes and features melting into the shape of a thick cock head.

Ty reached up wonderingly and stroked the head of his new cock, then ached and squealed as Jeff slid a goop coated hand into Henry's mouth, the only feature left of the little mouse. As Jeff petted and stroked, he felt his orgasm building, and frantically squeezed and rubbed his huge new cock all over.

"Jeffy! I'm gonna--"

The little mouseboy giggled and pulled his hand out. He watched Henry's lips form an 'o' of surprise and pleasure, then a torrent of cum poured out, hitting the ceiling, splattering Tyler, and thoroughly coating Jeff as he grabbed his big brother's huge new cock and aimed it at himself like a hose, getting it everywhere.

When the flood stopped, Jeff smiled at the site of a smooth, normal slit at the head of Ty's cock, Henry's mouth washed away by cum and the final effects of the goop. He looked at Tyler, gasping for air, and climbed onto the bed to look the new cock over from his older brother's perspective.

It was huge, from any angle. Although the orgasm had smoothed and streamlined it, putting the final touches on their literal "handi"-work, it was still almost twelve inches around and three and a half feet long fully hard. He studied it critically, noting the slight curve upwards from Henry arching into his first full-body orgasm, the slender veining, the even color...

Jeff petted it, smiling, and leaned in to give it a kiss on the tip. "You're a really sexy cock, Ree."

He hopped off the bed and stood in front of it, and let out a giggle. Tyler's balls had grown a little, but not nearly as much as his new cock. They were as big as hen's eggs, but next to that mammoth piece of mouse, they were tiny!

Jeff took a deep breath, and grinned. "Well," he muttered, "I guess I'm the solution to that."

He climbed up on the bed, and stood with his feet on either side of his older brother's waist. "Ready to eat me, Ty?"

Tyler, still fighting to catch his breath after the most massive orgasm of his life, nodded frantically. Jeff smiled and pressed his hand into the slit, giggling as the cum soaked fur lubricated him. When his hand met no resistance, he pushed his other hand in alongside it. "Wow, Ty. It's really smooth in he-whoa!"

The huge cock began contracting rhythmically, swallowing him up to the elbows in seconds. He moaned and humped against the cock swallowing him, grinding into it with a broad smile on his face. His eyes were locked onto the opening as his arms vanished, drawing his face ever closer.

Ty sat up and wrapped his hands around his cock, feeling the outline of Jeff's arms running the length of it. He pulled his cock forward, fighting off the contraction that were swallowing the young mouse and bringing his little brother's face close to his. "Well...I guess you're just cum now, huh, brat?"

Jeff shivered, drawing a moan from Ty as the motion vibrated down his length. "Y-yeah...just cum inside my big brother's balls. Sliding down what used to be my twin."

The older mouse grinned and grabbed the back of Jeff's head, pulling him into a deep kiss. He pulled back and, as Jeff tried to spout off some quip, shoved his face into the head of his cock while the mouseboy spluttered with mock annoyance. Ty grabbed the boy's ears and used them as handles to press his little brother even deeper, before pushing those in too.

Jeff writhed and humped wildly against the underside of his cock as it started swallowing him again. Ty lay back, cursing and gasping as his new cock stretched to accommodate his little meal's shoulders, and sighed with relief as it finally managed it, then began working on his narrow chest. After a moment's breather, he peered around his cock, and was greeted by an incredible sight.

He could see Jeff's face pressed into the tube of his cock, halfway down now and up to his tummy. He reached up and lazily rubbed the little mouses' cock a few times and pressed it into his tummy as it disappeared into the gaping hole that was his cock head now. He scooched back, wrapping his arms around his dick and jerking himself off, loving the feeling of the way his cock was becoming Jeff shaped as it swallowed him, like a snake full of prey. As the little boy's ass vanished into his cock, he pulled his tail a little just to watch him kick, then jerked in surprise as a new feeling slammed into him.

He looked down to see his ball sack swelling as Jeff's hands and forearms filled it, the shapes of those hands pressing out against the straining skin. He moaned and ran his hands over the cock so tightly mirroring his little brother's form, gasping as Jeff started kicking.

The motion brought his legs up over the cock, and his slid a good foot downward, trapping his thighs together and spilling his head out into his balls to join his arms. He watched, panting and holding onto his cock for dear life, as Jeff braced his forearms against his pelvic bone and pulled more of himself into his older brother's balls.

Ty let out a yelp of shock at the feeling. His eyes fogged over from pleasure as he watched Jeff brace again and pull himself in until only his feet were hanging out of the tip of his cock. He tightened his arms around the shaft, holding the slippery little mouse in place long enough to give to wiggling morsels a few good licks, then pushed them in.

He watched them slide down his shaft a little, helped mostly by the contractions. Ty frowned, and glanced down in confusion, before realizing that Jeff couldn't get as much leverage with most of his upper body inside the slippery sack. Grinning, he put his hands around the head of his cock and pushed downward, vision flashing white with ecstasy as he squeezed his little brother into his balls like toothpaste out of a tube.

When his vision came back, he sat on the edge of the bed panting, staring at the lewdly stretched sack of flesh in the shape of his little brother curled up in a ball. Ty gathered the little bundle of flesh and mouse up, and hefted it up onto the bed, maneuvering around until he could lay with his head on his pillow and his little brother-bulge between his legs. He lay back, running his hands through the still sticky residue of his first orgasm, and sliding his feet over his swollen sack, moaning with pleasure.

"Well, Jeffy, I guess I won't have to worry about telling you apart from Henry anymore," he murmured. "And I think you're going to spend every minute that you're not reforming inside my balls, right up until I shove Henry into you and make you a permanent part of my body. I think you'll be a much better load of cum than a little brother, don't you?"

He felt the laod-to-be wriggle happily in his balls, and laughed as he felt his new cock surge and jump, almost as though Henry were agreeing. With that, Ty laid back, massaging his balls with his feet, one hand gently stroking his new cock, and decided to take a nap while his balls churned Jeff up.

Inside his balls, Jeff writhed around, feeling the sack that held him so tightly pulse and squeeze him, working to turn him into cum. He giggled, licking the sack to get a taste of what he would become, and moaned eagerly at the flavor. He worked his hand around behind himself, and started scooping up handfuls of the stuff and working it into his ass while he jacked off. He felt his hole softening and opening up as the cum went to work dissolving it, and squeaked when his whole hand vanished inside.

Jacking as fast as he could, he fisted himself, shoveling handfuls of thick fluid into himself, eager to speed up the process so he could spend as much time as possible being a puddle in Ty's balls. He opened his mouth, felt it fill with the stuff running down the walls from the two little egg shapes tucked away at the top of the sack. As he writhed, he felt his feet squishing against the sides of the sack, and grunted eagerly.

He left off stroking for a precious few seconds to grab his ankles and bring his feet up to his face. He rubbed his face into them, then felt his hips relax as the cum he was packing into his butt softened his joints, and his feet rested easily on his face. As he went back to jacking his increasingly squishier cock, he pressed his lips against the soles of his feet. They were pliant, warm, inviting...he let out a keening noise and took a bite out of his left foot.

Instead of flesh, a flood of cum filled his mouth, and he swallowed it fast, before licking and biting his vanishing feet like soft-serve ice cream. As he took his last bite, his right heel, he felt his face stick and moosh into it, blending into a blob of cum. He came, adding a tiny load to the mess of cum he had mostly turned into, then quivered as he felt a surge of it rush through him.

Moments later, he was floating free and formless, thrumming with pleasure, just a puddle of mouse juice waiting to be shot out.

As Ty's cock slowly went limp, and the last bits of Jeff's conscious mind vanished into a haze of bliss, all three settled in for a nap, waiting for Ty to wake up and put his former twin brothers to good use.