As you drink the water, you feel a strange shift in your balance. Regaining your footing, you shrug off the strange feeling and walk back to your house. After an afternoon of fun and excitement, you head upstairs to your bed. As you get into your bed, you feel a strange heat run through your body. Ignoring it, you drift off to sleep.
Waking up bright and early, you immediately notice something is wrong. What little body hair you have seems to have increased. Brushing this new development off as your imagination, you eat some breakfast, grab your bag, and head off to school.
As you walk down the street toward your school, you are suddenly overcome with a series of painful cramps. As you fall to the ground (landing painfully on your back) you notice several things happening to you at once.
The first noticeable change comes when your feet grow to an enormous size, effectively destroying your shoes. As you stare at your huge feet in shock, your legs gain a huge amount of muscle, shredding your pants and underwear and leaving you naked from the waist down.
Then, your entire body is covered by soft, silky, chocolate brown fur, with your hair being replaced by similar fur (only longer). As you run your hands down your furry body, you feel the bones in them shifting around. Looking at your hands, you see them turn into paws before your eyes, with tiny black claws replacing your fingernails. Your huge feet turn into paws as well. As you stare in shock, the muscles in your chest thicken, ripping your shirt so that the only things that you are actually wearing are your collar, your waistband from your jeans, and a few shreds of fabric that once were your sleeves. You have no time to blush however, as more changes are happening.
First, you feel an incredible pain at the base of your spine. Looking back, you see an enormous furry tail sprout out of your spine. Your ears lengthen and move to the top of your head, giving you a better sense of hearing. Your nose and mouth then form into a muzzle, with your sense of smell seemingly getting a boost.
Finally, several other changes happen. The first comes to your great chagrin, two modest sized breasts sprout out of your chest. As you rub your paws over these furry orbs to make sure they're real, you see a raised flap of skin sprout out on your lower chest. Looking at it, you realize that it's a pouch. Suddenly, you feel the heat again, as your male privates shrink down into nothing to be replaced by female organs.
As you get up, you notice that while you were noticing the bigger changes, you must not have noticed the smaller ones. Your body is now slightly hunched over, a result of your huge tail. You find that your enormous legs aren't great for walking, but you can hop incredibly far.
Finally, you realize what just happened. You are now a female kangaroo, wearing nothing but a few shreds of clothing over your marsupial body. "Well, this sucks." You say to yourself, and then clap your paws over your muzzle, surprised to find that you can still talk. Turning back to your house, you start hopping, hoping that your parents will be able to help you, and hoping they'll actually recognize you.