Chad noticed how quiet the locker room was. Everyone was at lunch. He found a manila envelope with his name on it waiting for him taped to the wall of the last stall.
He opened the envelope. Inside was a note and key.
"Good bitch, Chad,
If you want your doggie dick to cum again, you best follow these instructions to the letter, bitch.
1) The locker room is too public for me. So go to the basement door, the key inside opens it. Go down two flights to the sub basement, and go to Room SB 14.
2) When you're in the SB14 strip. Put your clothes in the empty orange bucket. Then take the hooded dog muzzle from the red bucket, and put it on. Then get down on all fours. When I blow my dog whistle, you'll hear it and change. If the hood isn't secured over your eyes and the muzzle tight over your snout, you won't be human ever again. Got it, bitch?"
Chad swallowed hard as he read, but he followed the instructions. The key fit in the basement door. He went down two floors, and found SB14 across from the fire-sprinkler controls. He tried to put the key in that lock, but it didn't fit. He tried the door, it was unlocked. There were at least a dozen buckets up on the shelf. Each was a different color. He found the yellow one and the red one, and followed the instructions. The hooded muzzle was a bit loose, but he secured it as best he could. As soon as he was down on all fours, he heard the whistle. His master must've had spycams watching him or perhaps a peep hole? He felt his body changing. The hood soon was fitting tightly around his muzzle and now canine shaped head. He felt his balls drop and his penis erupt from his belly. Damn, it felt good to male again, even if he was a dog. Oh, damn, his pussy was dripping. He was in heat.
He heard the door open, and he sniffed. His master's scent was clearly discernible, but it was less wolf-like than yesterday. It suddenly occurred to Chad that his master was in human form, and was going to fuck Chad, and change while fucking him. He was both excited and terrified, what was wrong with him? Why? How could he want this? But he did with every furry fiber of pussified body, Chad wanted and needed to be owned.
"That's my good little bitch," said a male voice softly. Damn, it sounded familiar but maybe it was his canine hearing that made it hard to place? He sniffed the scent. He would remember him. But he couldn't walk around sniffing every guy's crotch in the school? A hand caressed the fur on his back.