Jayden felt a deep, dull ache in his newly-enlarged sack. The feeling radiated down his meat, reaching a climax towards the fat tip. His comically oversized prong lengthened again, gaining roughly half an inch, and thickened by just as much.
The boy felt a gripping sweep of panic wash over him as he attempted to rationalize what he saw.
"I...there's no way...," he stammered, while feebly attempting to encircle his new monstrous girth with a hand.
Dustin was perplexed by this, as he had deliberately stopped his stare to give the poor boy some relief. Had the growth become self-sustained? Or was this a one time thing? This could have unfortunate consequences.
Jayden finally snapped out of it, remembering where he was, and more importantly, who could see him. "I have to get home," he thought. With that, he did his best to adjust his new situation below his waistband, and began walking out. It suddenly dawned on him, though. How on earth would he hide this from his mother until he could get to his room? He glanced down at his shorts, struggling to contain the absolutely obscene amount of cock coiled up in there.
"Fuck..." he said aloud, "I'm an actual horse down there..."
Every step he took caused his colossal testicles to bang against each other, making him wince slightly. He would need to find a different kind of underwear in the future, but right now it was torturous.
He needed something, anything, to cover himself with. Wait! His mom had given him a little spending money. Surely there was something around he could use to disguise his third leg.
He moved over to the area holding almost exclusively activewear, and found a pair of athletic shorts that had a sort of built-in pound for discretely pressing one's endowment against a thigh. Perfect! And only $14.99, too.
He awkwardly brought them up to the counter, doing his best to hide the massive flesh pole beneath the counter while he did so. After the purchase was complete, he dashed into the changing room, balls slapping the whole way.
In the changing room, Jayden finally got to look at his new member completely in the open. As he removed the underwear that had become all but useless, his long, fat penis uncurled and slapped against his thigh with a soft 'thud'. His eyes practically fell out of his head as he stared at it in the mirror, taking it all in. It wasn't just the biggest cock he'd ever seen, it was the biggest cock he could have imagined. Possibly even bigger. The thick, veiny shaft snaked it's way to his knee, criss-crossed with a large, prominent network of veins that trailed down to an absolutely frighteningly swollen glans.
Jayden almost laughed to himself at the sheer impossibility of what he was seeing. "I could be the first middle schooler porn star..." he mused.
Snapping back to reality, he donned his new shorts, taking great care maneuvering his new endowment into the specially crafted sleeve.
To be honest, if you were paying even the slightest bit of attention, it would be obviously this scrawny 12-year-old boy was packing enough meat to make a draft horse jealous, but it was miles better than before. This would have to do.
Seemingly satisfied, he left the changing room, and went to go find his mother.