Jake was mesmerized with the appearance of hair over the new lumps of abdominal muscle, so he was taken by surprise when his pants fell down off of his ass, leaving only the tight pair of briefs to cover his shame. His shame began to feel more like pride as he felt himself through the briefs, disappointed that he could not get his hands in because they were so tight. His penis had filled the pouch of the briefs completely, and as it responded to Jake’s touch, it began to expand and push against the cotton and elastic of the underwear. Jake knew that this was bigger than he had ever been, and James and Nick could see every detail because of the tightness. The jock filled with more meat as his cock expanded; pulling the waistband as far as the elastic would let it go. 6 inches; the cock grew thicker and longer. 7 inches; the fabric was pushing tight against Jake's flaring cockhead. 8 inches; Jake could finally reach in through the leg to feel the shaft. Nine inches; the underwear began to rip open - the briefs literally exploded and fell in shreds to the floor. Finally, after Nick and James had each fired their first loads of the afternoon all over their naked, sweaty chests, Jake let go of his fully grown cock and let all ten inches spring up with a twack on his top set of abs. His glorious dick was now at attention; bobbing slightly from the impact on his stomach, and then slightly throbbing as he maintained erection. The bulbous head pointed straight up, above his navel, to the faint indentation in his chest created by his new manly pecs. The thick shaft curved nicely into a man-handle, growing out of a tuft of dark pubic hair that had sprouted at the base of his cock. Below the impressive piece hung a set of nuts, the size of golf balls, in a nutt sack that dangled like a young bull's.
Jake calmly took his left hand and ran it across his muscled chest and abs, and soon took his right hand and roamed over his dick and balls to see if it they were real. He then wrapped his hand firmly around the base of the shaft, barely making a fist around the tube. Jake moved his hand lightly upward, then down, its length. He tilted his head back, moaning and licking his lips. A little bit of precum began to leak out of his cock so he grabbed it and used it for some lubrication. As he continued to jack off, he couldn't help but start to think about how much fun life would be from now on.