This choice: The kid experiences horniness. Orgasm triggers the growth! • Go Back... All the way home Tim fidgeted I his seat. He found it uncomfortable, no matter how he wriggled his butt.
“Hey, stop it!” said Mark, nudging his little brother. Tim didn’t listen to him. Something was stirring down there... His pee-pee was tingling, but he didn’t need to pee. His little balls also felt itchy. He didn’t know, but the scattering altered the phase of the beam that hit him, causing his reproduction cells to mature more rapidly. His testicles swelled a little as they produced sperms for the first time. This caused an entire series of other effects, including a slowly heightening libido, despite Tim being a 5-year old kid.
It also stimulated his body cells, making him grow in overall size an inch. This was nothing like puberty: the effect was an even stretch in all dimensions, growing him slightly while still maintaining his regular physical shape. But it also made his clothes slightly more uncomfortable.
All of these were alien feelings and excitement for the kid, as he couldn’t really explain these changes in his body.
Once they arrived home, his father got a phone call. Once he finished, he sighed. “Okay, that’s it. Another emergency job, this time at Jacobs’. Sorry boys, I can’t take you there with me. Mr Jacobs hates kids... I’m afraid I don’t have a choice, you have to stay home!” He stepped to Mark. “Promise me you’ll look after your brother! I don’t want to hear any trouble of you two.”
“Okay, dad!” Mark answered. “You can chill.”
“Make sure he gets everything he needs! Don’t forget, he’s still in his growing age.”
“I promise!”
“Good boys.” Thomas patted both kids’ head. In a few minutes he left.
They were alone in the house.
“Okay, pipsqueak, we’re gonna...” Mark stared at his brother who was shaking. “What’s gotten into you?”
Tim gulped. His pee-pee started to bulge in his pants, which became visible in the outside, as the fabric curved more and more out. “I dunno... My wiener... It’s...” He moaned again. Adrenalin rushed through his body, his heart rate elevated, blood flew more rapidly in his veins. His pupils dilated, and he took deeper breaths. His testes swelled a little more as they produced more sperms.
Mark scratched his chin. He didn’t want to call his dad – finally he had a chance to show the old man he can be left alone home! Maybe they can sort this out. “Show me. Take it out.”
Tim stared at his brother for a moment. Then he reached for his zipper, and pulled out his penis.
Both kids stared in awe at the organ, which was much larger than they remembered, semi-swollen, almost 3 inches long instead of its normal 1.5 inches. The purple tip peeked out from beneath the foreskin. The testicles were like nuts, the skin looked stretched.
Tim turned pale, but Mark started to laugh.
“What? Is me wee-wee sick?”
“Bro...! You’re having an erection!”
“A what...?!”
Mark sighed. “It’s completely normal. Although it shouldn’t show at your age, not yet anyway. It’s when... Uhm... When girls... uhm...” He found it hard to explain the whole thing to his little brother.
Tim shivered. “Do you... also often have this... erection?”
“All the time! You have no idea!” Mark straightened his back proudly. “Two times a day! Three if Cindy sits next to me in class...” He smiled sinisterly.
“And... How do you cure it?” Tim looked back at his penis which seemed to stiffened up more. The tip also crawled our more, and the whole thing throbbed and shivered, especially when he pulled certain pelvis muscles.
“You just beat it out!” Mark announced it as it was the most natural thing in the world. Which kinds was, usually.
“What?! I don’t want to hurt it...!” cried Tim.
Mark sighed. “Okay, okay. This might be a bit weird... But I promised dad I fulfil your needs... Let me show you. Lay on your back.”
The younger brother obeyed as the older one kneeled down. Mark gently grabbed Tim’s shaft, and squeezed it a bit. As a reaction, the 3 inches long organ surged out, hardening to 4 inches long. “See... first you have to turn it full hard... then slowly...” He gently jerked the skin.
Tim moaned harder. Imaginary stars popped into his vision. All new kind of excitement rushed through his body. It felt good! Better, even! Mark moved his fingers up and down, moving the skin with it. He set up a pace with a slowly increasing frequency. “Now the keyboard to find a nice rhythm... also helps if you fondle the balls, like this... Christ, yours feel stiff...! You must be really pent up!”
Tim felt he’s entering heaven. He panted more and more, even twitched his hips, helping Mark jerking him off. His penis became rock hard after a minute, and a mysterious white drop of liquid appeared at the opening.
“Ah, right. That can happen too.”
The 5-year old kids’ entire body shivered as the excitement escalated. His muscles jerked, he was sweaty all over the place, he panted and heaved, the heat became more and more unbearable. His penis shivered, more jizz appeared at the tip... Mark looked at him with a proud smirk.
Suddenly, Tim’s entire body spasmed. He curled back his back, moaned hard, all his muscles tensed, and he shot his first true string of cum, thin, white and hot, flying almost a foot high before it landed on his tummy.
And then something else happened to... His body trembled, and suddenly, swelled – the little kid was growing as his cells went haywire from the orgasm, expanding in space.
Tim’s clothes stretched. The boy was growing fast, gaining inch after inch. His shirt split open, then his jeans started to tear up. His toes poked out of his socks. His underpants stretched around his waist. Then his penis shot another string of cum this time it seemed a little more voluptuous, resulting another growth spurt.
He was already 3 and a half feet tall when his clothes started to give up. Mark dropped his mouth, releasing his brother’s organ, which also grew and thickened with him. Even without guidance, now wobbling freely, the penis throbbed, and spat another rope or jizz, which flew all the way to the kid’s lengthening feet. Tim burst to 4 feet tall, his clothes exploding off of him, leaving him butt naked.
His brain barely registered what was happening. He moaned, his mind was lost in bliss, ecstasy ruled his thoughts. Mark stood up and stepped back, watching his little brother growing and cumming, more and more. 4 and half feet... 5 feet...
Finally, his orgasm, with his miraculous growth stopped once he reached 6 feet. He became as big as an adult... Twice as large as he was before...!
Tim’s senses slowly returned, his heart rate normalised. Using his elbows he sat up – only to drop his maw when he noticed his size, the amount of white substance on his tummy and legs, and his destroyed clothes.
“Bro! You didn’t mention this would blow me bigger...!”
“Uuuuhm... That’s because it usually doesn’t...”
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