Ty and Peter waited outside the bathroom, just anticipating Mike's exit. They had returned to their normal size a while ago, along with their clothes. Their changes were finished, but Mike's was not. "I'm not coming out guys. This looks weird." Mike said from behind the wooden door.
"Come on, Mike. With our powers, we already know how you look. It's not weird either." Peter said. Ty agreed. They waited a few moments as the door slowly creaked open. Mike exited it warily, with Peter and Ty urging him on. He stood in the door frame as a far cry from his body just minutes ago.
He was still about 5'11" but his body way drastically different. Instead of a large bulbous gut, he had a hard six pack, and his breasts were now large solid pecs. His shoulders were defined, and his large upper arms were pushed out by his lats. His shorts were filled by a muscled butt and big thighs. He had grown up, to around 20 years old.
"Well Mike. I did the fat thing, now you get to do the muscle thing. Congratulations, it takes most people a lifetime to become a 230 pound muscle man, and you didn't have to lift a thing." Peter said. "And, we got bigger all night with you, so you know what's in store for today."
Mike hung his head for a second with some embarrassed laughter "I guess I'm going to be a really big bodybuilder by the end of the day then." A knock came from the back door, and Mike walked to get it with Ty and Peter in tail. Dustin stood there with the gym bag, and looked up at Mike. He could tell it was him, even in the older body. "He gets muscles? I thought he gets fat."
Peter and Ty laughed "It was part of a deal." Ty cut in. "And it's a shame you didn't come last night. All we did was sit around and get fatter." Dustin rolled his eyes and told them to "come on."
They went to the gym, which was sparsely attended. Only one bodybuilder was there. They looked at the man as he turned to reveal an enormous gut shooting out over his posing trunks. He seemed to be doing every exercise he could in order to get rid of the solid blob. Ty and Dustin knew who it was, and they each had a giggle at the man's expense.
The guys went and got changed into their workout gear, and found the man gone on their return. Only the owner remained at the desk, and he wasn't paying attention. Mike sat at the bench press as Dustin went to the treadmills. Ty simply stood as Peter messed with the free weights.
Ty watched as Mike started to lift the 110 pounds that the machine was set to, and Peter's wish came into play. Mike's arms and chest began to swell. With each push of the bar, Mike beefed up even more. He packed on pound after pound, which he was aware of, but he couldn't seem to stop. He eventually stopped, finding his upper body swelled considerably. He must have put on 30 pounds.
"A bit disproportionate, Mike." Said Ty. "Maybe you should try the other machines. Mike did what he was told, and tried out the other machines. Coming back 30 minutes later, with his clothes almost ripping from his body. "How much did you put on Mike?" Ty said.
"Well, I just checked the scale, and it says that I'm 330." Mike said with a bit of a dazed tone. He tried to pull his shirt down, but instead, it ripped on his massive chest. "You know what, I bet Dustin could use your guys help. I'm pretty big now."