January 2024 Prompt: Who's the Big Brother Now?

Who's the Big Brother Now? (Powerlifter Growth/ Strength/ Musk/ Size Difference)

After a long day that signalled the start of spring break, high school senior John Greggor rushed home in his car. Ever since he had gotten a notification during fifth period that the package was delivered, John had been anticipating the item he had desired and what it would give him. But there was a nagging voice that dreaded what he might see as he knew his brother had been home at the time. The slim young man tried not to focus on what his brother might do, hoping that despite his time in college and general douchey personality, even Larry wouldn’t open someone else’s mail… hopefully.

Otherwise, John would be dealing with a worse nightmare than he was currently dealing with.

Getting to the street, John barely kept from speeding before driving his pickup truck up to the driveway. John cut the engine and just remembered to put it into park before practically jumping out of the car.

Throwing open the door, John barely had time to put aside his backpack before a set of strong arms grabbed him in a headlock.

“Hey runt, you ready for two weeks of being my rag?” The cocky voice of his older brother rang in John’s ear. Whilst the smaller man tried to pull off the thick arm, he was relieved to see his brother was still the same-sized asshole from this morning. However that relief was clouded as Larry forced John’s face into the football player’s exposed armpit, the rank smell telling John the older brother had been working out. After what felt like too long, John took a deep breath as he was released, stumbling to the ground and coughing. “Get used to that runt, now I gotta work out in the garage. You better have dinner ready when I’m done,” Larry called out, walking over his weakling younger brother before the sound of the garage door slammed shut.

“Asshole…” John cursed under his breath before standing back up. Looking over the entrance-way, John saw a parcel on the table. The tape-covered cardboard was slightly dented, whether during transit or by Larry, he wasn’t sure. John went over to the box and got to work opening it with his house keys, praying that what was inside wasn’t destroyed.

“Thank God,” John said with visible relief as he saw what he had ordered had survived his brother’s abuse. Reaching through the mountain of bubble wrap, John smiled as he brought up the bottle, he got from M.A.S.S. Inc. No longer having to deal with being pushed around by the more muscular sibling, this tiny bottle promised John a chance to put the more arrogant Larry in his place. Ignoring the dosage warning, something about only taking one teaspoon, John unscrewed the bottle cap before holding the bottle up as if he were making a toast.

“To the new me,” John said as he stood by the table, popping open the bottle before gulping it all down. Immediately the sweet, candy-like taste filled his mouth before the liquid flowed down into his stomach, where it rested and filled him with warmth. Lowering the now-empty bottle with a sigh and a small burp, John let the bottle fall from his hands before the heat began to spread through him, already signalling the growth that was kicking in.

Biting back a moan, John brought his hands to his flat stomach, gurgling loudly as it began to puff out and swell under his touch. His lithe form began to stretch taller in spurts as his torso and waist thickened out. John’s shirt was getting tighter, riding up his swelling gut as his once flat chest began to bulge with swelling muscle as pecs formed. John struggled to keep from moaning with excitement and relief as his feet burst through his shoes with his limbs thickened out. The growing man wiggled his thicker toes, ripping through his socks as the wooden floor beneath him creaked from his increasing mass.

“Fuck...” John moaned as his body was hit with another growth spurt, the heat of the growth causing him to sweat heavily. The growing man lifted his thickening arms, sleeves shredding as his biceps bulged with power, pumping more and more as the growth worked on. His shirt finally tore open as his pecs and round gut were released, the heaving chest and solid stomach bulging further and further with every deep breath he took. John’s broadening ass swelled, tearing his jeans along with his widening thighs. John knew that his ass could easily crush the armchair in the house if he tried to sit on it, and he wasn’t even close to done with his growth. His widening back spread further out, muscles on muscles covered in a more than healthy layer of fat. John brought an ever-increasing hand to his solid belly, running it over the growing surface as he noticed his wispy body hair was now significantly denser, giving the thicker treasure trail and dense chest hair a proper appraisal. Giving the round belly a shake, John moaned as he felt the heavy bulge of his cock bounce too, stretching his now overtaxed boxers, though the fabric now resembled a speedo with how stretched it was against the burly man. Relaxing under his touch, the growing John licked his lips, feeling the curl of his facial hair, before heaving up a resounding belch that rattled the windows.

“The Fuck? What the hell are you doing runt?” John smirked at Larry’s shout before he began to walk, his heavy footsteps shaking the house as the scraps of clothing that weren’t stuck to his sweaty form fell off. Standing tall, the giant man smiled at how much bigger he was now as he stood before the now smaller doors of his room, unable to resist relishing the way he now waddled with his bulging thighs and how the floor cracked under each footfall. Before he could even attempt to squeeze his enlarged form through the doorway, John smirked when the door burst open as an annoyed Larry stepped through. The older sibling’s expression quickly shifted to shock as he had to look up at his now gigantic brother.

“J-John?!”

“In the flesh, runt.” John smiled, raising his arms in a double bicep flex. His thick fists almost broke through the ceiling. The immense man breathed in the musk that flowed out from his exposed pits, feeling his cock erect whilst the smaller Larry coughed. “Now move aside, I gotta try the weights.”

John pushed towards the door, forcing Larry to scramble back into the garage. The smaller man was about to try and close the door only for John to grab it and break it easily off its hinges. John smirked with his head and broad shoulders above the doorframe, giving his hirsute-covered pecs a bounce to show off to his tiny brother. The giant man crouched down and moved through the door shoulder and arm first. Getting halfway through, one of his heavy pecs and thick legs got through the door whilst the widest point of his gut and ass began to get wedged, the doorframe splintering as the giant man began to force his way through, his strength and size too much for the fragile structure. The immense John placed his hand against the wall and started trying to push himself through, causing the wall and doorframe to crack under him as he forced himself through.

With a crack of the now broken doorframe and wall, John got through into the garage. His heavy body shaking the entire house before standing tall in the makeshift family gym. The huge man was feeling proud as he glanced back over his shoulder, seeing the wrecked doorway behind him before he shuffled down the hall towards the stairs. John relished how his wide hips brushed against the bare walls of the hall. Each step he took shook the house. Getting closer to the stairs, John smirked when he caught the sound of his brother shouting in confusion, clearly wondering why the place was shaking. Taking a glance at the stunned Larry, John went over to one of the weight machines. There was no chance of John fitting on the seat, but that wasn’t needed as the hulking behemoth grabbed the metal structure in one hand, his fingers warping the metal of the main machine before lifting it.

“God Larry, can’t believe you struggle with this? I’m holding it with one hand and it’s barely making me sweat,” John said. Of course, he was sweating, but that was less from struggling to lift the machine and more from his body heat. Dropping the unusable machine with a deafening bang, John walked to his brother, relishing the look of shock and fear on Larry’s face as he knew the power dynamics had shifted. Grabbing his brother, John decided to have some fun as he stuffed the tiny man into his armpit, chuckling a deep booming laugh as the small football player struggled, his waving arms barely light taps against John’s massive body. Feeling the former bully had enough, John graciously let him go. Larry curled up on his knees as he coughed and gasped for air.

“Jesus! What the fuck happened to you?” Larry coughed out and stood up, a look of defiance on his face. The defiance was quashed easily as the former older brother found himself pinned against a bare wall by John’s solid gut. The round surface pinned him in place as Larry’s face was forced to look up past the forest of hair that covered the board-sized pecs to John’s smiling face.

“I just had a little growth spurt. And I think we’re going to have some changes here.” John chuckled deeply, his cock rising and digging into his tiny brother, more than aroused by how easily he overpowered the once stronger Larry. Before John could begin the plan for what would happen, his stomach let out a deep gurgle with hunger. “But for now, I think we’ll start with a meal. Better get to work feeding me, Larry. We got all of spring break to get closer,” John said, smiling even more as he felt the familiar warmth from before start to spread again from his stomach.