Chad looked at the label and read, "Jock Spray", he paused as he read the fine print, "Oh, maybe this will help. It says "After applying spraying rotate ring around nozzle from green arrow to red arrow. Aim sprayer at subject and depress button."
He turned the ring around the nozzle, and then he raised his armpit, and pushed the button. There was a strange swooshing noise. Todd blinked. Chad was gone, the can was hanging there in mid-air. It started to fall. Todd's athletic reflexes kicked in. He reached out and caught the falling can. He looked at it. The label had changed. It now sported a glossy blue label with a photo of Chad naked except for a jockstrap, and the label now read, "CHAD: SPRAY ON JOCK."
"Hm?" said Todd as he read the label and the instructions. He started to smile. "Well, let's see if this stuff really works." He aimed the nozzle at his naked crotch, in spite of what he saw happen to Chad, or maybe because of it. The yellow mist floated over his crotch, and then coalesced into a jockstrap covering his junk, and wrapping around his waist and buttocks. He felt warm all over, and watched as his black pubic hairs sticking out over the waistband faded from black to dirty blond, just like Chad's. He strutted over to the mirror and grinned. Chad's face grinned back at him, as he flexed. He was two inches taller. His blotchy acne skin was now clear and tan. Todd was now Chad's twin.