The next morning, Aaron's eyes fluttered open, just like it did any other day. Only, this Saturday morning, he smelled a deeply masculine scent in his room and felt a strange weight on top of him. He looked down, aghast at the humongous, thickly muscled arm that wrapped around him. His tiny 5" prick sprung to attention immediately, much to his shame. The teenager froze as he heard a deep rumble come from behind him. The huge arm draped around him tensed, his gargantuan of a brother balling his calloused hand into a fist, cracking his knuckles. He watched as the tendons in the massive man's forearms danced, the way the veins criss-crossed across his paper-thin skin.
The small 18-year-old whined as the hand that belonged to his massive younger beast of a brother gentle stroked his flat chest and stomach. He felt the searing and growing log that pressed between his asscheeks spurt a load of pre-jism onto his back. Kyle moaned lowly as his thick beard tickled the back of Aaron's smooth neck, his breath hot and filled with lust.
"Morning, bro," the giant cooed. His hand roamed down and Aaron could practically feel Kyle's smile as his thick fingers wrapped around Aaron's small erection. Without words, the bigger brother began to stroke Aaron's length, the smaller, older brother shuddering as he could feel the hairy muscles behind work slowly. Kyle pulled Aaron up and rolled onto his back with his tiny brother now lying on top of him. His other huge arm came around and began to insert his giant finger into his smaller brother's anus, teasing him physically and verbally. Aaron couldn't take it any longer. As Kyle milked his prostate, he blew a watery load all over his thin chest and stomach, the small boy screaming for his huge brother with need. Kyle just laughed, his older brother now so enamoured with him.
He didn't even have to ask Aaron. He laid on his back on the bed, his hands behind his head, his head framed by his enormous biceps. He leaned to the side and licked it, spurring his Aaron into a lust-filled frenzy as his soft lips encircled his giant brother's cockhead. His hands were a blur as he worked Kyle's 13"+ length, feeling the added length and girth from a night's worth of growth. Kyle bucked his hips and his huge hands grasped at his thick, downward pointed nips, drawing out his orgasm for minutes as he blasted load after load down his smaller brother's throat.
The bigger brother smiled as he basked in his afterglow and stroked his brother's hair as Aaron crawled up and curled into his arm. His massive prick bobbed at the the thought of his brother's complete submission. He tossed the little guy to the side and got up, stomping his way to the industrial scale in the bathroom that his father had purchased just the other day.
"Fuck yeah," the musclebeast roared, bouncing his pecs and flexing his arms down, giving himself a show in the mirror. He pulled his huge erection to the side just so he could read off the number on the scale again. "340 fuckin' pounds, fuuuu-" he roared as his cock began to blast another load all over the mirror and vanity, smitten with how large he was getting.
Aaron gulped as he watched his brother descend the stairs, a possession in his eyes. That wasn't his brother anymore, but a new beast entirely. He slowly crept down and whined in his throat as he watched the monster hungrily mix himself a huge shake.
Kyle ripped the top off a fresh jug of whole milk. He gulped down a good quarter of the contents, his Adam's apple bobbing as he greedily consumed the liquid. He wiped his mouth and then began to stuff powder after powder into the jug, scooping vast amounts of protein powder and supplements. He didn't even shake the jug thoroughly, too hungry for growth. He chugged the nasty concoction, his massive tool already bobbing with need and leaking a steady, healthy stream of pre-cum.
The teen titan smirked as he put the empty jug on the counter and let out a rumbling belch. He chuckled deeply, patting his distended stomach, knowing all this mass was going to turn into rock hard, sculpted muscle. Kyle snickered and grinned wolfishly as he turned around and made his way to the basement, his smaller brother following him like a good little lamb.
Aaron experienced first hand what Kyle's workouts were now like. His eyes bugged out of their sockets as he watched the 14-year-old bodybuilder go at it, piling plate after plate onto the bar.
"Ungh, you know how good this feels, 'big' bro?" the young hulk snickered. "When the lift gets easier with each rep, when I'm growing so strong, so quickly. It's fuckin' intoxicating," he groaned, his eyes glazed over with muscle lust. His eyes refocused and his smirk grew sinister as his eyes darted between his weedy and weak older brother and the huge erection jutting out of his crotch.
"Nnnghuh, slowly!" Kyle moaned lewdly as his brother's hands and mouth surrounded the length and tip of his giant tool. "Don't get me off, just tease it, bro," he commanded. Kyle's eyes rolled back as he felt his balls going into overdrive, releasing a cocktail of androgens and growth hormones into his bloodstream. It made him feel so strong, so... MONSTROUS!
Kyle roared as he beasted through set after set of lifts, his balls tensing agonizingly as Aaron denied him release. It spurred him to lift heavier and heavier.
Hours later, Aaron was lost, his head light and his thoughts almost vacant as he worshiped his brother's pumped, blood-reddened body. Kyle was equally spaced-out, all the blood in his body drained from his head and into his muscles. His tongue lolled out, delirious from being edged for so long. His cock and balls felt so swollen.
The rest of the night was a blur for the two of them. Worship, sex, gorging and feeding all blended into one rapturous event. So much so, Aaron woke up Sunday morning with a strange sense that something wasn't right.
He smelled the strong scent of manly musk and felt a huge arm around him once again, an even stronger sense of deja vu washed over him. Only, the man behind him wasn't the hulking bodybuilder his brother had become, but something even greater.
He got up and stepped away from his brother, his jaw slackened as he drank in the sight of Kyle's even larger body. With his younger brother's newfound devotion to mass, Aaron's baby brother's body's growth was kicked into overdrive.
Kyle smirked as he too woke and felt the new changes. "Fuck, I'm... I'm huge!" he boomed with delight, his hands roaming across his even further enhanced body. He stood and scooped his tiny older brother off his feet and stormed into the bathroom. "Read off what it says," he cackled as he dropped his brother to the ground and felt himself up as he stepped onto the scale.
"3... 380," Aaron sputtered, his eyes going wide. His brother's growth had doubled with all the extra feeding, lifting and hormone production he was subjected to yesterday.
"Hooo... yeah," Kyle rumbled, closing his eyes as he slowly stroked at his member, it too feeling like it was growing faster than before. "Oh fuck, little guy, get ready for breakfast, I think you'll find it's bigger than before," he chuckled, feeding the tip of his veiny crotch-cannon into Aaron's mouth.
The rest of the day was much like before. Kyle lifted, guzzled inordinate amounts of protein shakes and supplements. Aaron edged him, his balls forcing more and more testosterone into his system.
By 9:00 PM, Aaron limped his way to the kitchen and whimpered as felt his abused behind. Kyle was snoozing on the bench, spent after fucking the smaller, older brother relentlessly. He fucked him so hard, Aaron shamefully came blanks, already too spent to produce semen anymore for the day.
Aaron's eyes lit up when he saw the home phone's light blinking. Someone had left a voice message.
"Hi boys," his mother's voice called wearily through the speaker. "Aunt Bea had a nasty fall. She's in the hospital and she needs us right now. You boys are big enough, especially you Kyle, my big little man! You're big enough to take care of yourselves. Dad and I might be gone for a week, maybe two?..." She rattled on about taking care of the house and buying groceries, but Aaron tuned it out, the dread rising inside as he realized that as much as he loved getting fucked by an absolute beast of a man, he didn't think what he and Kyle were doing was healthy... and now he was stuck with the sexbeast for at least another week by himself?!
Kyle fucked him again that night when Aaron broke the news. "We're gonna have so much fun, shrimp," Kyle cooed into Aaron's ear, the older brother whining in assent.
Monday morning came around and Aaron's daily ritual of waking up before the crack of dawn continued. He looked back at the slumbering giant on his bed. Even in the dim light, he could tell Kyle was once again even bigger.
For once, Aaron was relieved to have actual food for breakfast. Cereal with milk never tasted so good, especially after being fed a diet of cum for the past two days.
His day at school seemed like it would be a good one. He'd get to focus on his schoolwork and his teachers were clearly enjoying his docile, studious nature. He felt almost at peace... until he was called to the principal's office.
He dropped his notebook when he saw a massive, 6'6" musclefreak, easily 400 pounds of mass on his frame. Kyle wore a tight black t-shirt and jeans, shrinkwrapped to his obscenely thick muscles and even more obscene bulge. He was hunched over the front desk and giving the ladies a good feel of his veiny, hairy arms.
"Heya, kiddo," Kyle boomed.
"Oh ahem, Aaron," the secretary coughed, pulling away from Kyle's arm. "Your big brother just told us the news about Aunt Bea, the poor thing." Aaron's cheeks burned at the remark of 'big brother'.
"It's just terrible," Kyle sighed. "Unfortunately, we'll be out of town for a few weeks."
"We'll have Aaron's tests deferred and assignments emailed, don't worry," the secretary said, her tone conciliatory.
"Thank you so much," Kyle said, flashing her a wink as he placed his hand onto the small of Aaron's back and ushered him out.
"What the hell, Kyle?!" Aaron whined.
"Now we got all week together," Kyle snorted, his eyes filled with mischief. The hulk of a teenager pulled their mother's car keys out.
"What the... Kyle you can't drive!" Aaron hissed as the giant squeezed his way into the driver's seat.
"How the fuck did you think I got here, pipsqueak? Walk like you do?" Kyle just chuckled. "Who's gonna stop a man like me, anyways?" he growled as he pointed at his steely chest. Aaron nervously got in and hung on for dear life as Kyle sped off.
At home, they didn't even make it into the door before Kyle flexed right out of his clothes, his monstrous physique on display as his melon-sized biceps burst through his sleeves.
"Fuck, I needed you so bad, bro," Kyle snarled, leaning over and lifting Aaron off the ground. His beard brushed against Aaron's smooth chin as their lips met. "I tried working out without you, and my gains aren't nearly as good." He flexed his titanic arm and Aaron couldn't tell, he looked pumped nonetheless. "Your tiny little boy's body next to mine makes my balls ache, bro," he whispered sinisterly into Aaron's ear. "I can feel all this testosterone coursing through me just being next to you," he groaned, his growing cock already hard as he rubbed his giant muscles against his miniscule brother's.
And so, day after day, the two brothers settled into a routine. Aaron felt a mix of disgust, fear and lust as he watched his brother grow more and more massive. He could even swear he could feel Kyle growing inside him with each fuck-session.
Aaron's body ached as he awoke Saturday morning, another whole week of Kyle growing bigger, stronger and more sex-crazed.
"C'mon, tiny, let's see how big I've gotten," a deep basso-profondo rumbled from behind. A calloused giant's hand wrapped around him and he felt his whole body shift as the titan his brother had become ducked and swerved just to get through the door.
As Kyle set him down, Aaron got a glance of the freak his brother had become in the mirror. He couldn't see his brother's whole face, just the bottom of his lips and a dense beard that covered his cheeks and chin.
Aaron grabbed at the tape measure on the vanity. "Let do height first," Aaron squeaked and Kyle nodded. The bigger brother picked him up and Aaron measured him. "You're another inch taller, Kyle."
"Fuck yeah," the beast moaned. He gentle let Aaron to the ground and reveled in his growth. "That makes me what?"
"6'10"" Aaron gulped. Kyle rumbled, a little disappointed. He had only grown in height at the same rate as before. But that only made the 14-year-old giant's other developments all that much more impressive. The freak stepped onto the scale and it groaned in protest underneath all the extra mass that Kyle had put on.
"What's it say?" the beast groaned, tilting his head back in anticipation of his new weight. Metal shrieked and springs buckled as Kyle shifted his weight from foot to foot, his thighs so stuffed with muscle it was difficult for him to stand on the scale.
"600 pounds," Aaron whimpered.
Kyle's smile grew and he flexed his arms for himself over and over, completely taken by his size. His breathing grew shallow, as his cock took more and more blood. Without coaxing, Aaron took it's measurement as well.
"17 and a half," Aaron coughed, pulling back in awe at his baby brother. Kyle just shuddered and turned to him, his gargantuan member slapping Aaron on the cheek.
"Time for breakfast, bro."
Tears formed at the corners of Aaron's eyes. Taking Kyle's length was getting harder and harder by the day. The small 18-year-old took solace in the fact that it was just one more week... one more week before the curse would be lifted...