he felt a tingling sensation in his calves. He planted his feet firmly, and his calves began to grow. Slowly but surely, inch by inch. He moaned as thick, defined muscle piled itself onto his lower legs. The muscle now protruded out the back of his legs massively, stretching his tracksuit bottoms to the limit.
The growth moved up his legs to his quadriceps. The already defined muscle began to expand, layers and layers of hard muscle piling on. There was a loud tearing sound as the muscle ripped through his tracksuit, turning them into shorts that rode up above his quads.
He tilted his head back and moaned loudly as the muscle on his firm ass began to balloon out. It kept going and going until it tore through his shorts, making them shred. It revealed a ridiculously stretched pair of boxer shorts. The shorts were stretched out the back, and the front began to fill as well as two massive cords of muscle ran down his stomach in a V, filling the waistband of the shorts to breaking limit.
He felt a tingle in his upper stomach, and moaned as a line appeared down his stomach. The small bit of fat melted away, revealing this line straight down. At the top, just below his chest, two cinder blocks emerged from his stomach. Another row emerged below it, and another, and another. He stared in awe at his brand new 8 pack abs, which were straining so hard that he could see them through his t-shirt. His obliques also pushed out, stretching the fabric to breaking point.
His small pecs began to expand,bigger and bigger.they swelled in every direction,out to his arms and up to his neck. When they filled that space,they began to grow outwards. He laughed as they tore through his shirt, and kept going, big, rock hard mounds of muscle, separated by a deep line. His lats flared out to perfectly frame them.
He heard a creaking noise as his back widened. Large, ripped pockets of muscle swelled across it, tearing through his t-shirt. His traps expanded, and his neck thickened greatly.
His hands started to grow, becoming heavier. The growth moved up his forearms as they swelled into thick,sinewy muscle. He gasped as his biceps and triceps expanded as well, nearing 20". He flexed them both, as his shoulders grew wider and wider apart until they hit the side of the stall.
Finally, his now massive body decided to put the young boy through puberty all at once. His small testicles swelled to the size of soft balls, and began to manufacture massive amounts of testosterone. This caused his penis to elongate so much that it burst through his pants.
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