....A large underground coral, half-filled with donkeys, all milling about aimlessly. You land hooves-first amongst them, catching them all of guard by your sudden appearance. Some of the skittish ones bolt immediately, the braver ones give you curious snuffles before rubbing their muzzles against your face in greeting. Immediately your face itches with the familiar buzz of changing, and soon you're greeted with the sight of your nose stretching for miles into the distance.
"N-heee-haw!!! St-haaaaaw-p!!!" You shout, or rather, bray in horror, your lips and tongue are getting too thick and clumsy to get the prounciations right. You try to push them away but upon contact your fingers start to ache and swell. They clump and stretch into a fine pair of shiny black hooves just as grey fur run down your wrists. "I-hee-haaaw b-heee-haw donk-heeee-haw!"
The donkeys don't quite get what you're trying to convey, but they do back off after seeing your distress - Leaving you to acquaint yourself with a new muzzle and a pair of forelegs. Thankfully, your body and limbs are still human enough to stay upright. Though you suspect that this isn't going to last long.
Your chances of escaping isn't optimistic right now, the only way out of the coral seems to be a pair of solid metal doors. Judging from the group of human-donkeys bashing themselves futilely against it, there's no way you're able to go through there without the jailer's approval. The ventilations and slides are too steep and slippery to find purchase on, not even if you still have hands and feet.