“Beginning phase four.”
“Well, let's just wait and see how this round goes, eh?” Charlie said irritably, as he waited impatiently for his turn. If he had taken the time to assess himself, he would have realized that he hadn't changed at all in the previous round, although he had grown slightly hairier.
Charlie certainly didn't take for granted the fact that he was once again growing, but he was also growing suspicious. For one thing, he could gauge his relative size by inspecting the length of his dick. It had clearly reached the bottom of his pecs after his growth last round, but it was failing to do so now. Since he didn't have his clothes anymore and he couldn't really compare himself to Lee, this was the only thing he had to go on.
He felt himself inflate all the way up, and finally he felt the telltale slap of his penis against his pecs. At this moment, the machine stopped. Charlie was filled with rage. This was all he would get. That twerp would pay.
He looked at Lee with red hot anger, and uttered, "You lied to me." Lee nervously looked side to side as Charlie marched forward. Charlie tried to ignore his rock hard dick pressing up against his hairy chest, begging for release. He had only one thing in mind: pound the shit out of Lee until the game ended.
"Hang on now," Lee squealed, backing away, "let's not do anything hasty."
Both boys heard the machine click, reversing the direction of the flow. Charlie knew he had to act fast.
"No, I think now is a good time," he snarled as he charged. He wasn't particularly athletic, but he had spent a lot of time using his body in the gym. With the added mass at his disposal, he knew he could do significant damage, using his body as his weapon.
Running was not as easy as Charlie had thought it would be. At this point, he was 300 solid pounds of muscle, but humans were not meant to carry that kind of mass around, and Charlie certainly wasn't used to an extra 50% of him. Though he propelled himself quickly, he was clumsy, his muscles almost getting in the way of each other, and his obscene genetalia protesting the whole time. He charged straight at Lee, who was able to leap out of the side using his lean, reasonably-sized muscles. Charlie only managed to clip him before body-checking the wall.
Of course, Lee was growing this whole time, and Charlie turned around to see Lee's shirt bursting in all directions. Charlie reckoned that Lee was about the same size that Charlie started at, and while Charlie enjoyed seeing what was essentially a clone of his beautiful (former) form, this enraged him further. Charlie leapt at Lee, tackling him to the floor and pinning him there.
Charlie had a serious size advantage, and he used this time to rough Lee up. However, Lee was growing at an astonishing rate, and of course Charlie was losing the same. Charlie saw Lee's neck grow wider and wider and he gasped as he felt Lee's body rising up from the floor. Charlie glanced down toward their lower body and he saw that this was because Lee's legs were still growing more massive. It also wasn't lost on him that Lee's chest, still exposed and bleeding, was growing hair at a prodigious rate, and by now had probably surpassed his own forest. Charlie barely had time to register this before he was flipped by Lee, surprising them both.
Lee, who was by now heavier than Charlie, spun them around to pin Charlie to the ground, as he had been moments before. As Charlie contemplated his fate, he heard the elastic waistband on Lee's pants and boxers snap, as they molted off his legs. Charlie was no longer bigger than Lee.
Lee smiled menacingly as he said, “What're you going to do to me now, huh?” At that moment, the pump clicked off and a familiar voice entered the room.