Billy stood up from all fours and started walking towards Matt.
"Please, man, change me ruff ruff woof! Bark! Bark bark bark!" his voice vanished as soon as he stood. Billy froze in alarm, then went back down on all fours. "Woof woof on all fours! Please, just turn me back to a normal guy!"
"Sit," said Matt.
"What? Dude, please don't make me take commands," said Billy, backing up on all fours.
"Bad dog," said Matt. He waved the wand, and suddenly a tail buttplug appeared in Billy's ass.
"Oohhhhh!" Billy moaned. "Come on, take it out!"
"Sit," said Matt.
Billy unhappily sat down on his haunches like a good dog.
"Down," said Matt.
Billy put his arms down and rested his head on the ground, looking pleadingly up at Matt.
"On your back," Matt said.
Billy rolled onto his back. His soft dick flopped between his legs.
"Hmm, I think maybe I can help you enjoy this a little more," said Matt. "Maybe if you were gay."
Billy gasped. "Oh please dude, don't. I have a girlfriend. Don't make me gay. I don't know what I'd do."
But it was too late. Matt was waving the wand. "Not only are you gay," said Matt, "but you're a slutty little exhibitionist."
"Please turn me back," Billy begged.
"Okay boy. Stand up," said Matt. "How do you feel now?"
Billy rolled back over and stood up on all fours. He looked around. "Actually ... I do feel better." He shook his head. "This is ... wow. It feels really different. Fun." He looked back at his naked body. "I look good, don't I?" He waggled his ass, and his tail plug waved back and forth. Billy laughed. "This is actually pretty great!"
"Show me your dick," Matt said.
Billy raised up his arms in a begging-dog pose, showing off his belly. His dick was stiffening.
Matt smiled and grabbed Billy's dick, stroking it. "You like this?" he asked.
"Oh, yeah, dude," said Billy. "I wish you'd done this sooner. I never knew how awesome this feels." He looked up at Matt. "Could you ... could you maybe throw a stick for me? I really wanna fetch stuff for you. I wanna be a good boy."
"You've a very good boy, Billy," said Matt. "Would you like to be my dog slave boy for ever?"
"Yeah!" said Billy eagerly. He licked Matt's face. "It's so amazing, dude. It feels so great. Oh man, I wish you could know what it's like."