The bathroom was silent apart from the brothers’ heavy panting. Jamie stared at the mess they both made, and the monster he had unknowingly created before him. Timmy loomed over him with a dazed grin on his face, feeling his newly grown muscles bounce with every flex. Minutes ago, he could be mistaken as one of Charlie’s teammates (albeit a roided super senior), but now he was a true behemoth. His frame nearly encompassed Jamie’s entire field of vision from where he was kneeling, the slick and still throbbing prick swinging inches from his face. Jamie wanted nothing more than to shove that foot-long piece back in his mouth, but…
“Let’s go again!” Timmy was bursting with excitement. His cock bounced in tandem, flinging strands of spit and cum at Jamie’s face.
“Timmy, we need to stop for a minute.”
“What? Why?” Timmy dropped his arms and looked at Jamie with confusion.
Jamie stood up to look at his little brother in the face. He gulped, realizing Tim was now eye level with his upper chest.
“This is happening too fast,” he thought aloud. “How did you even get this big?”
“I dunno. I kinda woke up like this,” he lied. Timmy wiped his drooling cock and licked some of the jock spunk off his fingers. “And you grew bigger, too! We’re like the growing muscle bros, hehe.” Timmy clenched his fists and dropped into a most muscular pose.
Jamie smiled, relieved that the little goofball brother he always knew was still inside the horny musclebeast before him. He thought of any possible thing that would have caused his baby brother to hulk out like he did. He didn’t remember much after yesterday’s horrible encounter with Charles, but his older brother instincts kicked in as he racked his memories of last night. “Shoot, I forgot to make dinner. Or read you a bedtime story. I’m sorry, Timmy.”
“That’s okay. I’m just happy you’re okay. And you’re even huger!” He grabbed Jamie’s battering ram, unable to fully enclose his grip, and gave it an appreciative tug.
Jamie moaned and couldn’t hold back a spurt of jock milk pumping out. “Timmy, we’re brothers. We shouldn’t be doing this,” he grunted. He took a step back, or tried to, as his shoulders and head bumped into the doorframe.
“Why not?” Timmy whined. “Charles said people do this when they really wanna be close with someone.” He closed the distance with Jamie, his swollen pecs pressing up and into Jamie’s as he placed his hands on his brother’s massive arms, slowly rubbing them. “And I really wanna be closer with you.” Jamie felt Timmy’s prick sandwich between them, hot to the touch and pulsing with need against the deep separations in his abs. His own slid underneath his little brother’s heavy sack, bobbing upwards against Timmy’s delicious jock butt with each heartbeat.
Jamie saw the same expression in Timmy he always had growing up: one with pride and love, but now Jamie could feel the lustful hunger in his eyes as well. He bit his lip. “Timmy…”
Timmy saw the internal struggle raging in his brother’s mind and took the plunge. He leaned forward on his tiptoes, and just like in the movies he watched, he closed his eyes and planted his lips on his enormous beast of a brother.
Jamie’s eyes widened in shock, and just as quickly melted into a half-lidded gaze as he felt a thrill in his chest. He responded in kind, leaning down to meet Timmy’s parting lips, hoping to never let that feeling go. That sensation blossomed even more with every following kiss that societal taboos were the last thing on Jamie’s mind now as he had never felt more wanted or loved than in this moment.
The smaller jock adapted quickly, letting Jamie take charge as massive, hairy arms wrapped around and pulled him into his brother’s embrace. The awkward, stiff pecks soon molded into softer, lingering kisses that made his toes curl. Their stubble rubbed against each other. He was floating, literally, as Jamie slowly brought him up with no effort at all, one hand palming the back of his head, the other against his lower back, and a searing hot tube of man meat pressing against his taint. Timmy tried to wrap his arms around the hirsute giant only to be impeded by impossibly wide lats practically bowing outwards to be groped. He started to uncontrollably thrust his member against Jamie’s cobblestone core, slick with copious amounts of pre.
But before Timmy could orgasm again, Jamie stopped and gently put his brother back down.
“Wha-“
“Timmy. I love you, so so much.”
“I love you too, Jamie!”
“But we need to wait. Charles said there should be small growth spurts every day, but you had one just now, and it was not by any means ‘small.’ I think the growth is catalyzed when we, er, pleasure ourselves.” Jamie stumbled to find the right words to explain to his baby brother who was now on the same boat as him. “If you cum and grow again, there won’t be any more clothes for you to wear. You might even grow as big as me!”
That was all it took. Timmy’s orange-sized balls seized up as he arched his back and let out a low husky moan. “Aw FUUUCK!” He quickly grabbed his shlong with both hands and jacked furiously as he sprayed rope after rope onto Jamie and the floor, adding to Jamie’s previous load. The thought that he’d be as big as the titan in front of him sent Tim over the edge as he erupted for what felt like even longer than his previous orgasm just minutes ago.
Jamie couldn’t believe how much his little brother was cumming, especially after just filling his gullet. Just how much spunk were those balls churning out? He clenched his fists, his massive forearms springing into deep striations, and tried everything he could to hold back. His own manhood slapped against his wet abs in defiance, ready to burst. He snorted like a bull and tried to think of anything but the incredibly hot scene in front of him.
After what felt like several minutes, Timmy’s orgasm finally slowed. He lazily rubbed the whole length of his dick to squeeze out the last bits of cum that rivaled a grown man’s entire load onto the tile floor. “I think… I think it’s fine big bro,” he huffed. “I feel hot, but not the same hot before I grew. Just… warm.” Timmy sighed and let go of his cock as it finally began to soften. He surveyed the damage and noticed Jamie still blocking the doorway, eyes shut, breathing deep. His rigid veiny member was so swollen with blood that the purple head nestled under his humongous pecs. It was so long that all he’d have to do is lean down to take in the head…
“That’s… good…” Jamie could barely hold it together. He didn’t want to take any chances. “Timmy,” he said in his best authoritative voice, “I need you to go to the store and buy us some new clothes. Can you, ungh, do that for me? Please?”
“But Jamie.”
“I promise we can play after. But tomorrow we have school and I need clothes that fit.” Jamie blindly palmed the doorframe and slowly extracted himself out into the hall, one shoulder at a time. “I’ll clean up the bathroom and start making breakfast so it’ll be ready when you come back. You can use the clothes Charles brought. Just don’t tell anyone else about this, in fact, don’t talk to anyone else, and come straight back home. We can play the rest of the day together. Deal?”
“… Deal!”