"Okay then. I'm gong to make you older." "Cool! Does that mean I get to be your age?!" "Heck no! Can't have you being my equal just yet." "Oh man! Why not?!" "Calm down dude. I'll make sure you're good looking at least." Tanner started typing in Derrick's new stats into the Chronivac. "Here you go!" Tanner turned the screen so Derrick could see how he would change.
Name: Derrick Jacob McBeall
Age: 16
Ethnicity: Caucasian
Height: 5’ 9’’
Weight: 154 lbs
Sexual Preference: Straight
Hair color: brown
Eye color: blue
Occupation: Student; 10th grade
"I guess it looks good.... I guess." Derrick was still miffed, but he would get over it. "Yeah, yeah... Anyway... You should take off your clothes for this. Unless you wanna destroy your favorite clothes." "Good idea." Derrick did as he was told and stripped down to his birthday suit. "It feels weird being naked in front of you." "I bet, but pretty soon I also bet you'll be dying to strut your body all over." "Is being grown up that good?" "You betcha! And you'll be finding out right... now!"
Tanner pressed enter and the two brothers both watched as the changes began. Derrick immediately hit a growth spurt as he moved closer to Tanner's eye level. "Woah!" Derrick looked down and saw his feet beef up and his legs straighten out. His legs started packing on the muscles. Then his hands were the next to grow. Derrick closed and opened them as he felt his new found strength. He had to move his eyes forward as his arms were the next to go. They likewise muscled up. Derrick wasn't some body builder or anything, but he was starting to look like quite the good looking young man. Derrick saw himself grow even taller as he stopped a few inches below Tanner's height. His torso was responsible for this as his pecs formed two hard slabs of meat. A prominent six pack of abs formed on his stomach. Derrick lightly tapped them in fascination. "This is so strange. My BoDY is HarD LIke a ROCK! Ah! My voice!" Derrick held his throat as he felt a prominent Adam's Apple. Tanner saw his face morph into that of the 16 year old he was becoming. It looked like he was taking more after their mother than their father
Tanner looked down as Derrick followed his lead. All that was left to change looked strange on Derrick's frame. His three inch penis looked even smaller on his huge body, but that was about to change. First, his balls expanded, filling out his sac quite nicely. They were the size of golf balls and hair sprouted all over them hiding his tiny penis. "Ah... Ah..." Derrick started to feel funny and was making erotic noises. "My... My pee-pee! It feels so hot!" They watched in awe as Derrick's new dick found its way out of the hairy jungle. From 4 inches... to 5... to 8... to 12. Derrick's new penis was growing to an amazing length and it was even erect. "Holy shit, dude! You're dick must be like 14 inches!" "Ah...dick? Is that...ah... what a big pee-pee is called?" "I guess you could say its like that... So how does it feel?" "I feel funny... Ah,ah... Like its filling up with warm liquid. Ah,ah,ah..." "So you need to cum, huh? I guess this is what instant puberty must do to ya." "Cum? Puberty? Ah,ah,ah. Tanner! What's... ah,ah,ah... happening to me?!" "Okay calm down. You see when you get a certain age, your, um, pee-pee will feel a certain way and..." "Ah,ah,ah... Never mind that! How do I make it stop?!" "Right! So get down on the ground. Here, I'll show you how its done!" Tanner laid down on the floor and started to make himself erect. Derrick followed his lead. Tanner finished setting up his cock and whipped it out. "Wow! You're... Ah,ah... um... dick? is big too." "Comes with the territory... Anyway, this is simple. Just move your hand up and down like this." Tanner started jerking off. "This is called masturbating! It's... ah,ah... what your do when your dick is hard? See... ah,ah,ah... Simple!" "Oh-Okay! Let's me try..." Derrick carefully grabbed his penis in his hands and began shaking it up down. "Ah,ah,ah,ah,ah,ah,ah,ah,ah!" "How's it... ah,ah,ah... feel!" "Ah,ah,ah,ah,ah... I don't know! Ah,ah,ah,ah,ah! It feels funny, but also kindah,ah,ah,ah,ah,ah... Kinda nice!" "That's how it's... ah,ah,ah... supposed to feel... Ah,ah,ah... Oh man! This is the stuff!" Tanner was getting quite into it himself. "Ah,ah,ah,ah,ah! Oh-Oh man! This is... ah,ah,ah,ah,ah... the, um, stuff?!" "You, um, don't have to say that to make it work, but... Ah!" "What's wrong?" "So... ah... Okay, do you feel something surging in the base of your cock. That's another name for a dick by the way." "Ah,ah,ah,ah,ah,ah! Um, now that you mention it... Ah... I do! Ah!" "Great! Ah,ah,ah! Now don't fight that feeling or anything! Just let whatever is happening flow out... Ah,ah,ah! Cause I'm at my limit... ah,ah,ah! Too!" "Um... Okay?! Ah,ah,ah,ah,ah,ah,ah,ah,ah! I'm... I'm feeling something!" "Yeah, we're gonna cum! We're gonna cummmmmmmmmmmmmmmm!" "Ahhhhhhhhhhhhhhhhhhhhhhh!" Derrick and Tanner both ejaculated at the same time. Tanner cummed his normal amount. It got on his clothes, but he didn't mind. Derrick though was cumming buckets. No doubt due to his heightened puberty. "Ha,ha! Holy fucking shit! Dude!" "Ah,ah,ah... What's is this stuff? Ah,ah,ah... This isn't pee?!" "Nope! That's cum dude. And you are being a fucking monster!" "Ah,ah,ah,ah! Wow! This is amazing!" Derrick's dick throbbed constantly letting out volumes of ejaculate. Eventually, his dick was starting to calm down and eventually stopped. "Ah,ah,ah,ah... THAT... WAS... AWESOME!" "Welcome to the adult world!" Tanner exclaimed as he picked his cum stained little brother up