"I think it was the black one..." Ms. Tomlin said to herself before handing you the strange bottle. "Now drink up, but leave some for the rest of the class."
You drink the strange black liquid. As soon as you do, you start to feel very strange. Looking down at your hands, you see short, golden fur sprouting all over them. Your skin starts to itch, and you feel more fur growing under your clothing. You stagger backwards and grab hold of Ms. Tomlin's desk as your body twitches.
Your body aches, and you clench your teeth as the changes overcome you. You see your fingernails grow out into sharp claws as your body hunches over, your bones popping and reforming. Your neck and face start to itch and a prickling feeling starts from it; feeling it, you discover a large, brown mane forming. As your hands form pads and change into large paws, you lose hold of the desk and fall to the floor, writhing. Your feet change into paws as well, ripping your shoes.
Suddenly, your spine starts to painfully elongate as a large lion's tail grows from your backside. Gaining muscle mass, your clothes feel tighter, then tear open. You groan as the changes move to your face. As your ears reshape and move, your teeth grow longer, changing into fangs. Finally, your jaw elongates into a lion's muzzle. The transformation completed, you roar, now a full-grown male lion.
"Very good!" said Ms. Tomlin, clapping. "Now, please move to the back of the class." You oblige, padding to the back of the room as Ms. Tomlin calls another volunteer.