The boy was struggling to get out of the water so much that he barely could say something. "Dude, what the hell is wrong with you?!!" He managed to say before his brother sank him underwater. He simply grinned of how easy was to overcome him with his new strength.
Of course, Adams hadn't missed the opportunity and hit the kid with the pubertifier as soon as he was in the water.
The young man looked how his brother had started to change. When he grew he didn't have a good look of his own growing but this time he had a good view of his brother. He noticed that his little brother's dick was stirring now and he remembered that he felt the same when his dick began to grow, he was squirming as he tried to breathe and was feeling uncomfortable from the swelling in his boyhood.
He was getting taller as well, his arms and legs stretching out, but he didn't seem to be getting the fit look that his older brother had got a moment ago. He was getting wider as he got taller, he looked more stocky than him. Dark hairs were already showing on his legs and arms. Either it was going faster for him, or his little brother was just hitting puberty quicker.
The young man felt an unusual feeling on his dick and he looked down to realize that his and his brother's dicks were rubbing each other. He also noted that his little brother's cock and balls had swollen a lot since the last time he saw them. They were slowly looking like his, not in length but in thickness, a small bush of black hair was already around the base with a light coating on his swelling balls.
His little brother should have aged at least three years, so he'd started moving past twelve. His upper lip and chin darkened a bit as a bit of dark hair grew in. More was growing around his navel as well, and under his arms. He seemed to be getting hairier quicker than his brother remembered it happening to him.
Then, he went through a sudden growth spurt, adding a quick six inches to his frame, his shoulders getting broader suddenly to catch up. Muscle was already forming on his heavy frame, packing on heavy. His legs were covered in dark hair, which was now growing up his thighs. His pubes were a thick bush meeting now with what was growing already on his stomach. Dark sideburns grew down from his hair and along his jaw. Probably fourteen and already pretty hairy. The young man finally let his young brother go, not sure how much longer he could hold him down, but was relieved when his young brother seemed to stay where he was. During the growth his cock had gone erect, a five inch boner, but almost as thick as what his old brother was already sporting.
He grabbed his young brother growing manhood and started stroking it and himself. His young brother didn't stopped him. He was nearing sixteen. His face was loosing it's baby fat, but not getting leaner, he was getting a heavy chin and brow, even his eyebrows were getting thicker. He had a complete narrow scruffy beard. His arm hair was thick and covered his forearms as well as some on the back of his meaty hands. The hair on his thighs was going from wispy to hairy, even getting to his ass. His hardening abs were coated in short dark hair that was slowly getting thicker, matching a spreading layer on his chest. Maybe the darker hair was making it seem more than it was but this seventeen year old version of him looked even hairier than his twenty four year old brother.
Eighteen and he hit one last growth spurt, stopping at six feet that even looked shorter because of his broad shoulders and barrel chest. His older brother was still stroking his dick, a decent seven inches long, but thick as a beer can, with a huge set of balls hidden beneath a thick layer of hair. The hair on his thighs and ass met slightly with his bushy pubes, his whole legs covered in at least a light dusting of hair, or like his lower legs, a pelt. The hair on his arms went about half way up his biceps before fading out. The hair on his chest exploded, joining with the thickening fur on his stomach. It spread out across his pecs, hiding the skin beneath a black forest, only his nipple sticking out from the dense growth. His beard had been growing thicker, his cheeks covered with short black stubble and down his neck a bit, almost meeting with the chest hair growing up towards his neck.
His old brother pulled him out of the water by holding his new manhood and let him on the riverbank gasping like he saw his brother did before. He stood like that for a while, stroking himself this time until he hit his orgasm and a few thick ropey shots of cum landed on his chest hair. Although he was the same age as his brother now, he looked so different from him. "Damn." He said in a rumbling baritone way more deeper than his brother who laid next to him still stroking his dick. He sat up and leaned over to look in the river his reflection. "Dude, this is crazy! And damn, do I really sound like that?"
His brother laughed as he shot his own load and then he sat down next to him, "It feels good, right?"
They looked at each other for a while, weird feelings rushed through their heads, as they watched each other bodies. They didn't know why they did it, but they suddenly grabbed each other dick with their large hands and pulled their faces down closer to the swollen mushroom heads. They pushed their lips roughly against the dick tips which were hypnotically throbbing, shocking them at first, but then they gave in and began to suck each other in a 69 pose. When they both hit their orgasms thick loads of cum were filling their mouths and they swallowed them without hesitation. The 'young' brother coughed almost immediately and recovered himself. "Sorry, I don't know why I did that... I just know that I feel weird on my penis and I need to kept stroking it until I shot that white goo again."
His 'old' brother shook his head. "Don't worry, I don't know what it is but I feel the same." They stared at each other for a second before they started to jack off vigorously again and again. They were touching their own and each other bodies as they do it, feeling their new musculatures and body hair. If that wasn't enough they used their bigger feet to rub each other erections and they finished by docking their penises through their foreskins and making a mess of cum and sweat.
"They are going to stay like that for a while." Adams said as he watched the scene from a short distance. "But it's good that they didn't suspect of me. That gives me some ideas." He said as he kept his way to the market.