Tom watched in horror as the beam from his wand seemed to arch. The pat from Alex had caused his aim to falter. But to Tom's surprise, the beam hit the mirror directly behind Michael, and hit him anyways!
Once more, the gym seemed to slow down in it's activity once more. Alex seemed to stop moving, and so did Michael. Michael, who had just been grown, was once more hit by the beam, and began to grow again.
First came his arms. His biceps, which were in the middle of a curl, both exploded upwards, adding mass on top of mass. Michael's triceps, while unflexed, also gained an obscene amount of mass, looking like two bloated horseshoes attached to the back of his arms.
Michael's pecs came next, which ballooned outwards, blocking around 40% Michael's view if he were to look down. The shirt he was wearing was being stretched to it's limits, and began to show signs of ripping. Tom actually couldn't see Michael's abs because his pecs were creating a shelf that lifted the cloth off of his tight waist. His shoulders, however, burst sideways once more, adding about 5 inches on each side of Michael. This caused this shirt to finally rip down the middle, revealing Michael's developed. 8-pack, which was fighting for room on his stomach. His lats and back also surged in growth, giving Michael an even more pronounced V-shape. He looked even more like a comic book superhero illustration now.
His legs came last. His already developed quads and calves surged outwards, looking like redwood trees trunks. Individual sinews and cords of muscle covered his legs, which made him look titanic! His shorts also began to tear, and with Michael's glutes pushing backwards, the poor piece of cloth finally gave in. They exploded off of his lower body, revealing a pair of white underwear underneath. Like magic, however, Tom blinked, and watched as the underwear morphed and became a pair of posing trunks, covering up Michael's professional bodybuilder level glutes. Not to mention it also covered up the other bulge developing in front of him.
Michael was now like a kid Mr. Olympia! He was the height of 4'9", but with 280 lbs of muscle, which made him look huge! The gym began to reanimate, and Alex and Michael both began to move again.
"Hahaha! What're you doin, Mikey?" asked Alex.
"I dunno! I thought it would be funny to try these little things! Kinda reminds me when I started training with you a few years ago!" responded Michael.
"Get that out of your hand you goofball! Take this one!" Alex, grabbed the weight and put it back on the rack. He then grabbed a 70 lb weight and put it in Michael's hand. "There ya go. Much better, right?"
Woah. Deja vu.
Tom looked around and saw some posters with Michael on them! Lots of them in fact. There was one where he was on the beach, advertising a product called, "Muscl-Gro". And there was another where it looked like Michael had just won a competition, with a thick gold medal around his neck, and a trophy in his hand!
Alex walked up to Tom once more. "I'll tell ya, when I grew like this, I thought I'd be the only one in the family, along with you of course. But when Michael picked up weights for the first time, he took to it like a fish to water! He gets all the girls at school, as you know. Glad to see that hasn't got to his head though, he's still a goofball."
Tom was glad to hear that Michael was still the same internally, for the most part. However, his new body had opened up doors for him never thought possible for a seven year old! He watched as Michael stopped curling and set the weight back on the rack. He walked up to Alex and Tom.
"Alright guys, I think I'm done training for today. I'm gonna go with- oh look!" Michael lifted his mammoth arm and pointed near the entrance to the gym. It was a girl, looking about high school age. "Hi Molly!" Michael said. Tom was surprised to hear the same, sweet voice come out of Michael's huge body. Michael walked over to Molly, and while she was much taller than he was, Michael easily lifted her in his arms. "Alright, we're gonna go back to the house! You wanna come with?"
"Naw, I wanna keep training. But, we'll see you back at the house!" he waved goodbye to Michael as he walked out of the gym, carrying his girlfriend in his arms, wearing nothing but his red posing trunks. "Welp, that leaves the both of us." said Alex. "You gonna head out too?"