The Mad Scientist 3 (Patreon)

When the machine was finished, poor Peter knew something was wrong. His body had gotten bigger and his face felt like he had a pig snout, and if he wasn't mistaken, he felt a tail on his bum. "This isn't what I wanted," he screamed. "Deep inside I am as hot as a porn star. I am a total stud and a total p--" and then he knew the truth. Deep inside he WAS a total pig, and now his outside matched his inside. 

(Silly story, I know, but I love the mad Scientist)