Your dripping, nearly flaccid penis goes through a massive growth spurt above and beyond anything puberty ever had to offer. Your dick is jet black, dangling near the ground with a flattened cockhead. You reach down and pick up a section of it with your hands, watching the farthest parts jiggle around in the are as you do so.
"Oh, yeah, ain't no penis enlargement better than this. Brad Jenkins can suck it!" you think, remembering a certain high school bully from years ago who was still bragging about the size of his dick at your recent reunion. Sure, he's got a kid now who'll probably become a college football king just like he did, and you'll be a lucky stud if you can sire a few foals that don't end up in a lion's belly before they grow up, but who cares? You'll get to show off your new body anytime anywhere. Brad still feels the need to make up stories about his after twenty years.
Some skin from your belly grows out and wraps around the base of your new equipment, which feels odd. You let go, and your cock's fleshy wrapper keeps the base sticking straight up while the length arcs forward to point at the ground. A feeling in your bladder seemingly dares you to give your new arrangement a test drive, so you flush some liquid down your fleshy firehouse. Your distant glans reports a tingle of pleasure as the yellow splatter spills out onto the dusty dirt. As you stand there taking the first of many outdoor pisses through your zebra dong, you feel a tightness near the bottom of your spine. For some reason, the act of peeing had triggered you to tense some muscles back there. Turning around to look behind you as the trickle tapers off, you see a striped, hairy tail arched up behind you!
You reach out to grab your tail, but you grabbed to hard and had to let go because that hurts. Still, after your done peeing, you watch your tail for a few moments, swish it around a bit and noticing for the first time just how unsatisfactory it felt must have felt in hindsight not to have a property extremity back there to bring completion to your spine. Brad will never know what he's missing, but you will!
You realize your cock feels warm and safe now, seemingly encased by your own body heat rather than exposed to the summer heat, so you look down and see that it's shrunk back up inside its fleshy wrapper. "Huh," you think, "that's cool." You could get used to having a handy built-in pouch to keep your stallion-hood cozy in when not in use. It's easy enough to bring it back out whenever you need it, too: a simple desire to see it brings the black, wrinkly member tumbling out into the summer air.
The realization that you can hear the doctor and nurse inside cussing about what a pervert you are makes you wonder how you hearing got better. Hoping it's your zebra ears having grown in, you reach up and feel them. They're even longer, wider and rounder than you expect them to be! Sweet. They're flicking around, too, trying to hear shit. Humans really got the short end of the stick! While you're messing with your new ears, you even notice your new mane sticking up between them. You start to moan and stumble over, though, we a sudden surge of growth overtakes your whole body. Your belly bloats up into a zebra gut-sack (basically a lion's pinata) while parts of your skin lighten and darken. Black and white fur grows out of your new striped skin-tone, and you don't know that you're going to be able to stand up much longer.
Fortunately, your arms are getting ready to take on part of your massive weight for you. You have to admit that you're probably going to miss having hands, but the round clogs of keratin your cuticles are fashioning are going to be a necessity in your new life. You flop forward, going up on tiptoes in the back as your feet shift. The last change to really grab your notice is your face growing out until you can't even tell your nose and upper lips apart without some effort. Your nostrils are flared out to the side, jet black, and your eyes are pushed toward the sides of your head as your snout inches forward with cracks and creaks. Some of the color and much of the clarity gradually drains from your vision in the meanwhile, until your looking out at a fuzzy but much for expansive field of vision. You barely even have to turn your head to see your tail flopping around. Your depth perception is off, but it might be a fair trade if you can scan almost your entire surroundings with your widely spaced eyes and movable ears. Your sense of smell isn't anything to be sneezed at, either, your realize, picking up a symphony of rather unique odors from within the dirt you soaked.
Anyway, it feels kind of good to your changes finally dragging to a close. It was getting a bit tiring to be constantly in suspense about the next thing. Now you can hopefully try to settle into life as a zebra, at least when they get you where you're supposed to go. It must be about time to find you if they're going to breed you, send you into the wild, or put you in a zoo. "As long as there's something to eat, I don't care," you think, hearing your rumbling equine belly through your new ears.