Max stared open-mouthed at the fairly large bubble in the front of his shorts, then down at the equally impressive bubble in his brother's pants. Part of him thought this was incredibly unhealthy, he was a freak, how would he get through life with a third leg? The other part of him thought he looked so freaking sexy with a cock over a foot long that stretched his underwear to the absolute limit.
Testing things experimentally, Max reached into his underwear and felt his cock. Nope it was definitely real. The thick organ responded to his touch, jerking a little bit. Max actually saw his bulge move just a bit as it happened. Gingerly reaching around, he positioned his cock down one of the leg holes of his shorts. Thankfully his shorts were just barely long enough to cover the end of his cock, though the thickness of it meant that any people who looked could easily see Max's endowment.
"Can I see? Can I see?" Max looked up at Craig, who crossed his arms. "I showed you mine, it's only fair!". Max thought about it, he did actually want to see it himself. Since no one else was in the restroom, he gingerly pulled his basketball shorts over his cock. Although it wasn't a huge difference, Max's cock was clearly longer and a little thicker than Craig's. "Woahhhh" Craig gasped.
Suddenly, Max felt a tingling in his cock! Both Craig's and his mouth fell open as his cock began to grow AGAIN! It almost seemed to reel out of his underwear, growing past Max's knee before finally stopping at a massive 24 inches - two feet long! Then Max's balls began to inflate again, quickly inflating from tennis-ball size to softballs before finally stopping at the size of melons. If Max's cock had been big before, it was positively monstrous now.
"WOAHHHHHH", Craig half-shouted, half-exclaimed, "your penis is huge!". Max just stood openmouthed as his cock swung between his legs like a pendulum. Almost as if in a daze, Max bent down and picked up his cockhead. It was about the size of a tennis ball. Not knowing what else to do, Max tried to pull his cock back into his underwear, but it physically wouldn't fit. All of the space was already taken by his large balls. Max pulled his basketball shorts over his bulge and crammed his cock behind the shorts. At least they held, but the bulge extended so far in front of Max that he was pretty sure the material would be permanently stretched out. He just stared dumbfounded, then started waddling out. Craig followed excitedly...