As Dustin continued to walk around the mall, he kept looking for the perfect people to "grow". But no one seemed just right, until...
"There!" Dustin spotted a boy and his younger brother browsing the clothing store. They both looked fairly athletic for their ages. The oldest looked to be about 13, and was fairly tall but on the skinny side. The youngest was similar, at 11 years old he had a slender build that was just slightly higher than average. Dustin noted that the older brother was looking at purchasing athletic gear for baseball, in particular a genital cup. Oh this is gonna be fun, Dustin thought.
Dustin stared at the older brother. Right away, he saw the boy's 4 inch cock began to thicken and elongate. Dustin saw the boy's meager balls begin to swell up as well. "Ohhhh" the boy moaned as his cock kept swelling up. Passing 6 inches, it began to run out of room in the boy's underwear. Dustin could see a bulge was beginning to grow on the front of the boy's athletic shorts. The boy's cock continued to grow longer and thicker, passing 8 inches. The boy now looked like he was stuffing a banana and two tennis balls in his shorts. Dustin finally stopped staring just as the boy reached 10 massive inches. When he turned away, he could see the boy looking slightly dazed and confused, but with a definite outline in his shorts. The boy just turned back around and kept browsing the baseball cups. Dustin chuckled, knowing that he might have trouble finding one that fit.
As Dustin turned away, he stopped, realizing that he forgot about the younger boy! After all, he couldn't just leave one brother blessed and one not! So he turned back and stared at the younger brother.
The younger boy, who was wearing gym shorts, had a smaller cock at just 2.5 inches. This was fair, Dustin supposed. Of course, that was no longer the boy's size, as his cock was steadily increasing in size thanks to Dustin's stare. It had already cleared the older brother's previous 4 inches and was nearing 5. As Dustin continued to stare, it hit 6 inches. The boy's balls also grew as well, from their tiny previous size to large grapes. Dustin finally stopped staring after the younger brother had about 7.5 inches of flaccid cock and balls the size of small eggs.
What Dustin didn't realize was that the growth of the two boys' genitals had another affect on their bodies. Their overgrown balls (particularly in the case of the older boy) were now providing their bodies with a huge surge of testosterone. As such, they began to rapidly mature. The older boy had already gained a couple of inches of height and was almost at Dustin's eye level!
Dustin looked back around to the boys again and was astonished to see that the 13 year old who was previously several inches shorter than Dustin was now almost his height! That meant the boy had to be almost 6 feet tall! Dustin realized that the only thing that he had changed about the boys were their genitals... testosterone! How could he ignore the secondary benefit of growing their genitals! Dustin decided to grow them again.