Geoff kept at this job for months, eventually losing count of the transformed travelers who passed though. He milked the cows (one was an old man he had once dragged sleeping from his room into the stables), slopped the pigs (two sows and a boar were the remains of a traveling party that drunkenly broke up the tavern one night) and kept selling horses.
After a particularly long and painful day of work, Jeff laid down on the straw in one of the stalls, only for a second, to rest his weary legs. It took only seconds for him to fall asleep.
What he hadn't figured out was that the magic wasn't from something the innkeeper gave his guests, that was little more than a short acting sleeping potion. What the magic worked on was any sleeping form.
So while he slept, Geoff transformed into a...