He sits back down at your desk, and sets about to work. He starts drawing a large barrel-shaped figure, and colors it in with the grey pencil. You feel your head begin to lift, and a body growing beneath it.
Before you knew it, you found yourself in a standing position. On all fours! You crane your head around on your much longer, more flexible neck. You see a large grey furry body extending far back behind you. You see, and feel, something whip into your vision momentarily attached to your behind. A tail!?
"What? What did you do to me?"
You find yourself almost tall enough to look at your own face, but you're still short enough to have to somewhat look up from your now undignified position.
"You're not even a novice. All you are, is a jackass!" he guffawed.
"Oh! Speaking of which...."
He sat back down, and started drawing again. You feel your genitals as you were about to respond... "Wha-?"
They expand. You feel your balls baloon and become massive and wobbly. Your penis itself grows a good two feet, and you feel the slit open up wide.
He stands back up to admire his work, as all you do is stand there on all fours. Humiliated, you take a peek back again, this time, diverting your gaze downward. Your grey wide body still fills most of your vision, but you now see the four legs attached to four hooves. And back further still, a huge jet-black one-eyed monster attached to your disgusting equine body staring back at you.
"Well, I gotta go! Here's the pencil sitting on this desk, if you are so inclined to fix your situation. Good luck with that! Hahaha!"
It dawned on you that you dont have hands. All you have are big cloppy hooves.
"Wait! What am I supposed to do with these!?" You asked in desparation as you clopped your right hoof on the floor.
"I dont care what you do with them. Stand on them, I suppose."
"You can't just leave me like this!"
"Would you rather just be a head lying on the floor, or actually have a body to be able to move around?"
"I-"
"Oh! I forgot! Donkey's can't talk. Can't have you blowing my cover."
He points at you as you find yourself frozen to the spot while he sat down one last time.
"What are you mmmmppphhhmmmpphhmmm!"
He erases your mouth. You then see your face extending forward. He draws in a bubble: "heee haaww hhee hhaaww." And points it at your redrawn mouth. "Heee hhhaawww!" You continue as you try to keep speaking.
You feel your ears growing, your forehead reshaping, and hair covering over your entire face. Finally, your hearing sharpens as does your sense of smell, but your eyesight dulls and colors wash out.
"Heeee haawww!" You try to speak again.
"Uh oh!" You think. "Now i cant even ask for help!" You clear your throat and try again.
"Heeee hhhaawwww! Heeee haaaww! Heee hhaaww!" You tried speaking several times, but it was useless. You no longer had a voice of your own, but that of a jackass!
"There! That's better! Now you sound like how you look."
"Heee hhhaaww!" you brayed again.
"I'll tell ya what. If you ask really nicely and say 'please, ' I'll turn ya back!"
"Heee hhhaaww hhee haaww hheee hhaaww!"
"Come on now. All you have to say is please. Bray if you want to remain a smelly old donkey jack."
"Heee hhaaww!"
"Very well, then. I'll put you where you belong, if you're going to be so uncivilized."
The being inhabiting your body went back to work. He drew a farm with a barn off in the distance, with other donkeys milling about. He even added green grass stuffed in your mouth.
Your room faded, as you suddenly find yourself outside in a dull, grey world. You find yourself chewing on something. Something kind of sweet and slimy. You try to spit it out, but you swallow instead.
You look around. The sky is a dull, grey flat color. Everything is dull greys with smudges of black. You smell rain in the air. You realize it is raining, and you're grey-furred hide is getting wet. You just stand in this random field, looking around your new surroundings. Is this some sort of farm? You hope not! But looking back at your barrel-shaped donkey body behind you, you realize it must be!
"Oh no, " you think. "Heee hhaaww" you bray plaintively. "I'm a donkey. A fucking donkey!" Heee hhhaaww!