The Chronivac whirred and flashed a warning, as soon as the subject formerly known as Tim moved 1 mile outside of the Chronivac scanning range. "Subjects outside of 3 mile range will be under default set parameters, and will commence resumption of their default form as soon as out of Chronivac range." Of course, Chris wasn't there to read this message. He was wearing his new jockstrap on his five mile run to the gym.
Tim was being a good jockstrap: being supportive, cradling Chris' nuts and cock, absorbing sweat, and generally being content. It wasn't until shortly after Chris passed the 3 mile point on the way to gym that Tim realized something was wrong. He was disoriented. His arms and legs wouldn't move. Right, he wasn't human, he was a jockstrap? The Chronivac! It all came back to him now. He started to feel really warm and taut.
"Ow!" shouted Chris as he stopped running and clutched his groin.