Cory always enjoyed spending time with his older brother. Even though there was an 18 year age difference, Cory’s older brother still treated him like a big kid and Cory liked that. One of Cory’s favorite things to do with his older brother was work out with him. Cory was only 8 year old, so his body wasn’t going to gain big muscle like his brother’s but he still liked being around all the big boys and watch them lift the big weights. One day, Cory and his brother went to a new gym. “Hey! What’s this place?” Cory asked as they pulled up to the new gym. “It’s uhhh, it’s a better gym than the one we usually go to. You’ll be able to do more big kid stuff here.” Cory’s older brother said with a smile. As they got out of the car and entered the doors, Cory immediately started to feel warm. “Is it warm in here?” Cory asked his brother as he fanned himself with his small hand. Cory’s brother laughed and replied, “you’re fine little bro. Look, I think I see a treadmill open. Why don’t you run for a bit and I’ll meet up with you later after I change into my work out gear.” Cory responded with, “okay bro, I’ll catch you in a bit.”
Cory walked over to the big treadmill. Cory looked at all the buttons on it and was instantly confused. “Ummm, how do I work this?” Cory didn’t want to look confused in front of all the big boys so he just pressed the up arrow until it read the number “24” in big red glowing numbers. Just then, the machine started to move. It was going pretty fast but Cory was keeping a steady pace. Cory started to feel warm again but ignored the feeling so that he didn’t look weak. “Uuuh!” Cory felt a jolt of energy surging throughout his body now. Cory tried to stop running but he couldn’t, it was like his legs were being controlled by something else. “He-Hey, What’s happening?” He was confused as his legs continued to run. Just then Cory being to spurt up in height. “Ugh! Wha?” He looked down noticing his clothes were tighter than before. He felt his shoes get really tight and his shirt barely covered his torso now. Cory looked around to see if anyone noticed his sudden growth spurt but everyone was preoccupied with their work out. “Uuugh! Not again!” Just then Cory felt the surge get stronger. He listened as his shoes began to burst open. “Ow!” His toes were now exposed and then suddenly his feet bursted through his small shoes. Two large size 13 feet replaced his size 7 shoes. He felt the surge crawl up his legs which caused his legs to grow larger and more muscular. Cory then started to run faster due to all the muscle weight he just put on. The surge of energy climbed into his torso. Suddenly he noticed that his chest was popping out and shredding the front of his shirt almost instantly. “Ugh!!” Cory was sweating as his body began to grow more muscular and taller. Cory’s shirt fell clean off of his torso exposing a mature and large chest and stomach. His arms were so big now. His body looked to be that of a young football player’s.
“Ooooh!” Cory’s dick began to throb in his tight gym shorts. He felt his balls drop suddenly causing his voice to deepen. His face kept his young boyish charm but resembled a much older man’s face. His shorts busted open as his butt grew larger. Cory continued running as his thick muscles and pecs jumped in place. His large bare feet hit the treadmill with every step. He couldn’t stop running, but he didn’t want to. All that was left of his work out clothes were a tight pair of underwear now. Cory felt so horny but he just couldn’t stop running.
Just then Cory’s brother came out. “Whoa! Hey little bro! Looks like the gym had no problem claiming you as one of its own already.” His brother said as he examined his once small little brother’s body. “Now don’t think this means you’re going to get bigger than me now.” He laughed as he patted his now large littler brother’s sweaty back. “You keep working hard bro, I’m going to head over to the weights.” Cory watched as his brother walked away slowly starting to realize that this gym was a not so ordinary gym and his older brother knew it.