Grabbing two jockstraps you head to the novelty store. There you purchase a pen with "Reappearing Ink". It goes on invisible but appears when exposed to temperatures of 90° or more. You write your name with the special ink and head to school.
ln the locker room, you go to the cage & grab the master keys. You find Brad's locker & swipe his jock leaving him the new one with the invisible writing. Then you prepare the other jockstrap for yourself.
"You're late," scolds the coach. "Now get in the cage. The period is almost over & the boys will need towels."
You comply with a smile. Next period is Wrestling practice. You plan to be watching from the doorway when Brad's body heat triggers his transformation. You'll step into your jock so you can replace him.
The bell rings.