He clicked the 'Save' button and awaited his change. It was not long in coming.
Immediately he felt a rush of a feeling of well-being. He felt better and stronger than he ever had before in his life. "This is great!" he thought to himself, and decided that if he got no more than this out of it, it would be worth it.
But, of course, there was more. He felt himself growing more muscular, and he began to strip off all of his clothing. He watched, fascinated, in the full length mirror on his closet door as his body grew in mass and became more chiseled and muscular.
"Wow!" he said out loud, and his voice seemed lower and more powerful, and he smiled.
The smile turned to a grimace in an instant. John was hit by a blinding headache. "Ow!" he said, and put his hands to his head. He could feel hard nubs on either side of his head, which quickly grew to become small, but rapidly growing horns on his head. As a result, he was less surprised when he felt a burning sensation at the top of his buttocks which gave him a twitching tail behind him, and he was positively pleased as his genitals gained in size, although it was disconcerting to watch them darken and alter into a nonhuman configuration.
"I've got to get photos of this!" he thought, but movement had become difficult; his legs were changing their shape and he felt himself forced upward, as if onto his toes, as his feet became hooves and his ankles thinned and his thighs thickened. He wobbled and threw out his arms for support, only to find that his hands and arms were undergoing a similar change. 'This can't be right,' he thought to himself; weren't minotaurs supposed to have a human upper torso? But as the changes progressed, so did his extremities - ALL his extremities - continue their changes, and he felt his pelvis changing in shape to force him forward onto all fours.
Finally, the changes were complete, and he saw to his distress that he had achieved his goal. He had the strength and power - and body - of a bull, with the brains - and head - of a human being, and was glad that an automatic change back was only 59 minutes away.