Something (the same) but different today: this manip was created by yours truly, with much help from  magus131

Andrew stretched out in the yard of his hotel, basking in the warm sun on Pleasure Island. It was the second day of his trip, and he had spent much of the previous night partying and drinking in the bars. As such, his head was pounding in a hangover. He struck a downward dog pose, pushing his ass up into the air. It was feeling sore, although he wasn't sure why. As he broke the pose, he felt a swishing around his legs but chose to ignore it, instead flopping onto his stomach.
"Haaaaaaaaw," he sighed. rolling over onto his back. It was then he felt a sharp pain like his leg was being squished. He rolled back over and felt for what was hurt, hands making contact with a fleshy, ropy mass connected to the small of his back. Terror struck him immediately as he pulled around an equine tail, seemingly attached to his body. "Whaaaaaaaaat the fuck?" he cried out.
Investigating the rest of his body, he found that his tail wasn't the only thing that had changed. Somehow he hadn't noticed the heavy dusting of fur on his torso, or the fact that he had much more than a five-o-clock shadow, or that his toes had fused together and the nails had calcified into thick hooves, hooves which were now the endings of his feet. Feeling about on his face, he noticed his nose was thicker and coarser, and his nostrils were much larger than they had been. His ears were perked up on the top of his head, furrier and longer than they had been the night before. Something was happening to him, and he needed help.
Running to the reception desk of the hotel as best he could with his new hooves, he noticed he wasn't the only one going through strange changes. All around him, other boys were shifting into donkeys. Before his eyes he watched tails sprout, ears elongate, and fur grow in. When finally he reached reception, the man behind the desk just laughed at him.
"You really think you want to leave, looking like that?" the receptionist said. "Wouldn't you feel much more comfortable with the other donkeys?"
"I'm nAAAAAAWt a donkey! You don't HAAAnderstand!" Andrew pleaded. "My name is HAAAAAAAndrew.... HAAAAAAAAAndrew..."
Andrew was slowly but surely losing his voice to his changes.
"What was that?" the receptionist asked. "Andrew? I don't see any guest under the name Andrew. One of our donkeys, however..."