The new young man was still looking at himself when he heard that someone was coming. It was his young brother who went to poop a moment ago.
"Excuse me, sir. Have you seen my brother?" The kid asked him without realizing that he was his brother. "We were swimming here since a moment ago but I can't see him around."
"You won't believe me, but it's me!" The young man told the child. "I was diving when I just grew up, isn't it amazing?!"
"I can't believe it, are you joking me?" The kid looked a little bit scared now. "Maybe he went back to the house..."
"It's me, I swear. I can prove it!" The young man lifted his right arm exposing his hairy armpit. "Look! oh well..." He realized that he was too hairy to see what he was trying to show, so he used his left hand to move the hair apart. "Now look! This is the scar that you made me in the cornfields two years ago, do you remember?"
"No way! It's really you! But how it's possible?!! You looked way more older than a moment ago. You even have hair in your armpits now!"
"I don't know what happened... I was swimming and diving in the river." The young man stopped briefly before he kept talking. "Maybe it's the water. Maybe this river has magical properties."
"Do you think so? But I was swimming in there too and I wasn't affected."
"Maybe you must go completely under the water. I was diving so..." The young man grinned and then he suddenly jumped back to the water. "Maybe I could grow even bigger if I dive again!"
"Wait, don't do it!" The kid said before he was splashed by his brother.
Adams thought that it was convenient they think it was the water that caused the growth, so he hit the young man with the pubertifier once again. Luckily, there was some growing up left on him to work with.
The young man quickly dove until he was completely underwater, but this time he made sure to keep his eyes open and on his body to see how he was getting bigger. The thought of getting older excited him, he felt his cock stirring between his legs, something that had only started happening recently, but it felt like it was in over drive. Experimentally he grabbed it, giving it a few strokes like he had seen his older brother doing it once. It made him gasp, at the amazing feel of it.
The changes were starting again. He gained a few more inches in height and a few more pounds of muscle. His cock gained a bit more, the feel of it growing in his hands was amazing. He didn't know it, but he was well hung, probably a nine inch erection sticking out in front of him. His black pubes continued to spread as his treasure trail finally met his navel, then traveled a bit past it. Hairs started to grow around his nipples, and a few between his growing pecs. His arm hair was up to his elbows and his leg hair was creeping past his knees to his thighs. His beard also filled out more, his sideburns growing to meet his thickening goatee until he had a full scruff along his jaw.
He can't hold his breath any longer so he came out the water and laid on the riverbank gasping, however he still felt he was aging and he kept stroking himself, his body now edging itself past twenty.
His cock stopped growing as it hit the eleven inch mark, his little brother was shocked seeing how his brother was getting older while vigorously touched his penis in a way that he had never even imagined it.
His balls hung low and heavy, a nice coating of hair covering them. His height and weight seemed to grind to a stop, now standing six foot two, and a decent 185 pounds of muscle, no one could argue he wasn't a full grown man now. The only growth that seemed to continue on him was his body hair. His thighs got a bit hairier, as well as a bit growing in on his tight ass. But it was truly noticeable on his torso. His treasure trail had thickened, a good three inch strip of kinky black hair up his abs. The hair around his nipples had started to spread out, a diamond of similar hair between his pecs spreading to meet it, a light dusting of them across his broad chest. With a loud gasp he finally came, shooting his first load to the sky and landing on his chest hair.
He stood still panting for a moment before he stood up and looked at his reflection on the river. What he saw made him smile, he was definitely over twice his age now, maybe twenty four years old, and a hunk. A square jaw, with a scruffy beard and his shaggy black hair atop his head. His body was toned and athletic, and looked so manly with all that hair across it. Staring at himself he felt his monster cock stirring again. "Nice." He rubbed his chin as he heard his deep rich voice, grinning at its deepness.
He turned back and looked at his little brother staring at him. He looked so small now, standing just above at his navel level and watching directly at his semi hard cock hanging between his legs. He can't figure out if his little brother was fascinated or terrified of it, so before the kid could do anything he grabbed him and threw him in the river. "Your turn!" He shouted him before he jumped back to the water.