Jim felt a bit of uncertainty. Cody was his friend but Cody was now a huge muscle freak! Maybe it hadn't been such a good idea to grow him quite so big.
Cody was feeling up his muscles. He took a slight step and his shorts shredded to pieces. He was completely naked now, his slightly larger than average package was now dwarfed on his 5 foot eight inch tall supermassive muscle bod.
"What are you thinking?" asked Cody.
"Just showing you that maybe it's not the best thing to be the biggest man in the room!" blustered Jim. He decided to just bull it through. Maybe it was his giant junk making him more agressive, but he lifted the balloon to his lips and said, "grow Cody proportionally!"
Jim blew into the balloon and Cody swelled taller, wider, more muscular, staying exactly the same proportions but with his size increasing taller and wider and more massive! This was a very fast accumulation of weight and Cody grunted as he swelled past 5 foot 10 inches tall. Jim blew into the balloon again and once more Cody swelled humongously with rapidly increasing height. Cody grew taller than 6 foot in height.
"See how you like it!" said Jim. He blew again into the balloon. Cody grew bigger and bigger, moaning and swelling and throbbing. Now he was 6 foot 3 inches in height, insanely massive. "want some more?" Jim taunted Cody, and blew into the balloon again two more times. "release!" said Jim and let the air hiss out of the balloon. Cody stood up, getting his balance. Now he was taller than Jim, over 6 foot 7 inches in height, wider than the door and insanely muscled.
"Happy now?" asked Jim. "You're now as big with muscle as I am with cock and balls!"
"Yeassss! rumbled Cody's voice from the behemoth chest. Cody was monstrous, as monstrously muscled as Jim was monstrously huge hung.