Neil lifted himself up, still groggy. It took him a second to realize what was going on. He was nearly naked on the floor of the bathroom. A gigantic, hulking Rob was standing over him. As he remembered what happened with the lightning, it occurred to him that he definitely had clothes on when the blast hit. The were laying a few feet away from him which meant that Rob must have undressed him. "What are you doing?!" screamed Neil.
Rob was so startled that he didn't have time to think. He couldn't come up with any reason why he was doing what he was doing.
Neil stood up, standing several inches taller than Rob, when he felt something weird. "These aren't my underwear," he said looking down at the red waistband. What the hell is going on?"
Rob didn't have an answer
"You know, if I thought for one second I could take you in a fight, I would kick your ass."
Rob needed to leave, but Neil was blocking the door. Rob began to move forward. He could easily push passed Neil and leave. Rob was so much stronger. He could barely touch Neil and he would fall.
Rob moved to push Neil out of the way, "I wish I could kick your ass," Neil sighed, "If only I had biceps like yours."
"NO!" cried Rob, but it was too late. Rob felt his shirt get looser as his beautiful biceps disappeared. Neil's eyes widened as he watched the muscle dwindle. Suddenly Neil's own arms felt a little funny. He looked down and noticed that his shirt, which was usually pretty loose, was riding up above his stomach. The neck and shoulders of his shirt were beginning to strain. Neil looked in the mirror and saw his new biceps. Confused, he flexed, admiring how much the muscle jumped up when he did.
There was no way Rob could leave now. Neil was stronger and he new about the power the underwear gave him.
Neil was very confused as to what had just happened. He looked back an Rob who looked a little weird now. His pecs and abs were still rock hard and massive, but with Neil's spaghetti arms on his body, he looked funny.
Still unsure of his new power, Neil hesitantly said, "I wish I had abs like yours." The same thing happened. Rob's abs disappeared, leaving behind a pale, flat stomach. Neil watched in the mirror as a perfectly cut 6-pack melted over his stomach. His shirt was riding up even farther now.
"I want your pecs," Neil said it much more forcefully this time. Once again, Rob's thick juicy pecs faded away. He fell to the floor, tears in his eyes. A few minutes ago, Rob could barely fit into his shirt, now the shirt hung off of his thin body. Neil's shirt on the other had exploded as his new pecs appeared.
Neil looked in the mirror. He saw a muscular version of himself wearing nothing but a pair of Supreme underwear. He wasn't really sure what had just happened, but he didn't care. All that mattered was that he was insanely hot now. He flexed and bounced his pecs a few times before noticing that his legs didn't match the god-like physique of his upper body. He turned back to skinny Rob but realized that he would have to take new legs from somebody else as Rob's legs weren't that muscular at all. He did notice something else though. Rob wasn't wearing any underwear and Neil could see the outline of an 11 inch monster.
"Give me your dick," Neil was much more confident and powerful now. He watched the outline on Rob's pants disappear. Neil's underwear bulged out suddenly. They were much to tight for his new dick. He reached down and grabbed a handful of his own cock, surprised at how big and sensitive it was. He didn't notice the underwear growing just slightly to accommodate his new equipment.
Neil put his jeans back on, which now had an obscene tent in them. He grabbed his massive shoes and put them back on too. His shirt was ripped to shreds though. Rob's shirt on the other hand was perfect. Neil wrestled it off of Rob's crumpled body and put it on himself. The shirt fit perfectly on his much taller body. All the contours of his abs, chest, and biceps were visible, but the shirt was only just tight enough so nobody would think it was odd.
He took one last look in the mirror at his new body, the tent in his jeans growing as he got hard. We'll deal with that later he thought to himself. He needed to find legs to match his body. Neil walked out of the bathroom and left a skinny, frail Rob laying on the floor sobbing.