Eric couldn't keep a smile from his face as his cock expanded, his balls matching the growth of his shaft. It was about ten inches long now, and his balls were the size of large eggs.
"This is awesome, Jay!" Eric exclaimed.
"How can you call this cool?" Jayden asked incredulously. "I mean look at me! I have no clue how I'm going to function as a human being with something like this attached to me! Plus, whatever happened to me is clearly contagious or something, since you're growing now too! How is this cool?!"
Before he could answer, Eric's cock and balls suddenly jumped up a couple inches in length, his dick crossing into footlong territory in a split second, and still going. His balls grew to the size of baseballs.
"Woah..." Eric said with still-unbridled excitement. He grabbed one of his swollen, cum-filled testicles and winced at how sensitive it was.
Just then, his length jumped forward again, this time about four inches. With over sixteen inches of thick cock attached to an eight-year-old boy, Eric was quite the sight to behold. Suddenly his growth slowed, and then stopped altogether.
"This is the most amazing day ever!" Eric cried in joy. "Let's compare how big we are!"
But then Eric's length jumped up again. It was slight compared to the last two times, but enough to be noticed. This restarted his gradual growth, and he started growing again.
"Eric..." Jayden said, "I don't think you're finished."
Sure enough, Eric was not done, gaining yet more inches of mouth-watering dick meat. After a minute or so, Eric stopped putting on crotch weight for good. Now, he was even bigger than Eric, at 27 inches compared to his brother's 22.