Private John, a well-built soldier, was going through his usual training routine. His dedication towards fitness was unmatched in the entire base.

Meanwhile, at the city police station, Officer Ethan, although lanky, was brimming with energy and determination to serve and protect.

One day, John and Ethan's paths crossed at an old building. They felt an unusual energy, suddenly, they found themselves muscular beyond belief.

They realized they could steal the muscularity of any male, turning them lanky. This discovery filled them with a sense of power and a dash of fear.

At a comic convention, they noticed cosplayers of Captain America and Iron Man. Unable to resist, they decided to test their newfound power.

They approached the muscular Captain America and Iron Man cosplayers. A quick touch and the muscularity transferred, leaving the cosplayers lanky and confused.

John and Ethan walked around, enjoying their new muscular bodies. The attention they received was thrilling, but they also felt a pang of guilt.

The cosplayers, now lanky, were disappointed at losing their muscularity. John and Ethan, seeing their disappointment, realized the consequences of their actions.

They returned to the old building, filled with remorse. They decided to return the muscularity they had stolen. It was the right thing to do.

They found the cosplayers and apologized for their actions. As they touched them, their muscularity returned, and the cosplayers were overjoyed.

John and Ethan returned to their original selves. They felt a sense of relief wash over them. They had learned a valuable lesson about power and responsibility.

From that day forward, they vowed to use their powers judiciously, understanding the importance of consent and respect. Their adventure had transformed them, not physically, but morally.