"What the fuck!?" Jamie and Peter turned to see Donnie, a blond kid in their gym class, staring at Peter. His mouth fell open and he approached the still-changing minotaur. "Shit! Is that some sort of weird costume? What is happening?"
Peter grunted as he gained another three inches in height, his whole body swelling with muscle. His nostrils had flared out and turned dark, becoming more bovine. Moving to Donnie with two large strides, he grabbed the stunned boy before he could get away.
Jamie backed away, wondering what Peter was planning. Black fur was spreading over his skin, and there was little to recognize as ever being human. Donnie struggled and kicked, held tight by the massive arms of the minotaur. "Let me go! Please! Let me..."
His mouth was covered by Peter's muzzle, and then his struggles stopped. It took Jamie a moment to realize they were kissing! When they finally pulled apart, Peter's mouth had become a full muzzle - and Donnie's nose and mouth had swollen out as well!
The boy was staring into Peter's blood-red eyes, looking dazed as his ears grew out and dark fur spread across his cheeks. Peter hefted him up nd turned him around so he was facing away, and then started sliding him down his barreled chest. Donnie gasped and then bellowed as the massive minotaur cock pressed against his butt.
Jamie grinned as Donnie's clothing suddenly split apart, revealing not a boy's penis, but the swelling udder of a minotaur cow. The Peter thrust hard, and sent his swollen bull's equipment into Donnie's new cunt. The two grunted and bellowed, now a full minotaur bull and his minotaur cow. When they finally climaxed, there was nothing human left of either boy.
Jamie grinned, amazed by the transformations. Then he realized the minotaurs were looking at him oddly...