Here's the thing about being a tall bodybuilder that nobody talks about. Even when you've got a couple hundred pounds, they're spread out so you end up looking trim and slim. So while Kyle might be big, he wasn't really BIG. But he was friendly as heck and his new friend Ty really appreciated that. It was obvious to Kyle that Ty was checking him out and interested in his muscle, but Kyle just kept it under control and flexed his biceps a few times--to Ty's delight. So when Ty decided to give him another boost, it was enjoyed by both of the boys.
As the boys chatted, Kyle's muscles started to slowly inflate. His last change was instantaneous, so no one got to really experience the growth. Now it was unfolding right in the middle of the food court. Every bite Kyle would take would leave his biceps imperceptibly bigger. Ty silently wished that people wouldn't notice the 12 year old's growth and accept it once it was finally completed. He also silently made sure all his clothing grew to accommodate the growing mass--but not before he made sure the kid was filling it out to bursting.
The boys chatted about everything from cars to books, music to muscles. It turns out in this AU, Kyle hit puberty early around 8 and started lifting to get out all the energy that pubescent boys seem to have, his school friends couldn't keep up. Ty could tell Kyle was a little sad about this and made a note to see if he couldn't help the boy out later. Kyle ended up winning his first bodybuilding comp around a year later; he'd grown a foot and was competing with guys over 2x his age, a 9 year old but at the same size as a junior bodybuilder!
Kyle leaned in and added in a whisper barely heard above the hum of the mall , "...and I was packing 'down there' than any of 'em!" He blushed at that admission. It was clear he was proud but didn't really talk about it much. Ty's eyes went wide and then shot down, but the view was hidden by the table.
"And that was 3 years ago. I bet I'm the biggest kid out there now. Muscle freak kid" Ty believed him.
"Go ahead, it's ok, no one's paying attention. You wanna feel?"
Ty reached his hand under the table and ran his hand up Kyle's quads. The shorts camouflaged it when he was standing, but here it was, bunched up and with a mound Ty could barely palm.
"Wow," said Ty, obviously impressed. He didn't have the heard to tell Kyle he'd seen (or rather transformed others) bigger. But still, he could tell Kyle was proud of his meat and Ty was nice enough to oblige for the kid just wanting to show off.
By the end of lunch, Kyle was closing in on 375 lbs and he was going to continue growing in the months to come, at a slower rate. Ty wanted this kid to know the strength of being one of the biggest bodybuilders on the planet, before he graduated 8th grade. Kyle and Ty parted ways, but not before Kyle gave him an open invite to hang out after his lifting sessions at the mall gym. Ty didn't realize there was one and got an idea when he realized there were several other bodybuilders around...