Peter and Joce laughed outside of the club, laughing at the events that just happened. This mutual growth was proving to be a lot of fun.
As Peter gasped to regain his breath, an idea hit Joce.
Now, each time Peter breathed in, his chest expanded, but instead of returning to normal when it exhaled, it remained slightly expanded. Slowly, Peter chest pushed out on all sides.
Eventually, the expansion began to spread to the rest of his body. It was like watching Peter inflate like a balloon, but still keeping the muscles definition in strange parody of when he had been that muscle god.
Joce kept Peter unaware of his changing shape, even as his shirt buttons began to pop, and the lower half began to ride up against his distended abdominal muscles. Each breath Peter took was even larger than the last.
Now his arms and legs were quickly catching up with his massive chest and gut as the "air" came in higher quantities. His arms were resting at a forty five degree angle at his sides, and his gait was almost a waddle to keep his thighs from getting in the way of each other. His jeans were beginning to make a strange straining noise as the seams gave.
Joce grinned. Peter was a muscle monster, growing larger by the second. Who knows what would happen next?