You down the potion in one gulp.
"Fitting", you think, "that the changes start in the mouth," as your mouth and nose start to feel tingly. It isn't too long after that your nose and mouth start to bulge out, melding together into a cute little beak. Your hands, and lower arms are next, becoming scaly and clawed, though still with human-like hand structure.
Just a moment after that, you feel something snaking down from your tailbone. It's your tail. You glance behind yourself to see a long, cute ocelot tail, with black markings on golden brown fur, wagging behind you. Closer to the base of your tailbone, you can see the similarly brownish tail-feathers of your kestrel side.
You then feel something wierd in your groin, as your reproductive organs change to an egg laying system.
Your feet are next, toes melting together, nails becoming claws, and paw-pads growing. A soft layer of golden-brown and white fur grows over your hind paws, and your legs as well, as they change to a digitigrade stance. The fur continues to travel upwards until about your sternum, where it abruptly stops, and spreads. White fur on your belly, groin, and haunches, as well as the insides of your legs and bottom of your paws, and Golden-Brown fur everywhere else below your sternum. Then, spotted markings of black pop up at random around the fur, mostly splotchy in the golden-brown patches, and spotty in the white ones.
Above your sternum, and a bit below, feathers start to grow in. White ones on your chest and face, with a yellow collar along your collarbone, and brown on your back, sides, and back of your neck. As the feathers grow, your breasts shrink, until you are entirely flat chested with no nipples. Black feathers start to grow on your forehead, and mixed in with your hair, which is turning a brown shade.
Your ears reform themselves, pointing slightly and moving to the top of your head, where they are covered with brown fur. You feel like you can hear a billion times more than you could before! Your eyes change as well, widening, with sharper vision and blue irises. You can easily see the length of two football fields now.
Your changes seem complete. You are a gryphon now, and you are loving it!
But the most important part hasn't happened yet...
Suddenly, massive wings, with a span easily double that of your arms, yet easily able to fold up onto your back, burst from your shoulder blades. The wings are black, speckled all over with grey dots.
You can't believe that you forgot about your wings! They are, after all, practically the most important aspect of gryphon physiology.
Folding your wings, you run over to your friend Sam, who is now a peregrine falcon/cheetah mix.
"This is awesome!" he exclaimed.
"I know, right?" you reply, bouncing from one foot to another with more energy than you have had in years.
Looking over the rest of the class, you notice that about three of the girls have started laying eggs, though the urge to do so does not strike you.
At the front of the grove, Mr. G speaks, "Ah, you are all finished. I was going to end class now, but it seems that an allergic reaction to some of the regents has provided us with a minor learning opportunity." He gestures to the girls laying eggs. "Observe, class, as the female gryphon lays an egg that will develop into her young! Though, these eggs are infertile."
"OK. Class is over!" a voice behind you yells. You turn around to see a centaur-lady, in a school nurse's coat and hat, standing there. "Frank! Why did you do the transformation without me present!. You knew about the possible side effects, as seen here, and yet you still did it! Now I have to clean up your mess."
"Calm down Lyssa, it's just a small allergic reaction," Mr. G says, trying to convince the nurse.
"Small allergic reaction, HA! And I told you to stop calling me that!" she replies, walking over to the trio of girls.
"Hello dears. My name is Mrs. Danube. I'm the resident nurse of this school. Here, can you stand?" Mrs. Danube says to the girls.
They nod.
"Ok. Let's go." she says, taking the girls out of the courtyard.
"Class dismissed. You are free to go." Mr. G. says.