All at once, an overwhelming pain and burst nausea takes over, and you grab your gut with a shout. You hear squeezing and gurgling sounds from inside there. Something inside you feels swollen, and then your nausea starts to dissipate, only to be replaced by a sort of multifaceted hunger. It feels like your stomach is growing and splitting up.
"That... that was weird," you say out loud, not sure you really want to know what just happened inside there. Then another swelling feeling takes over inside your balls. You look down to see that they're lengthening and growing to be enormous, hanging down low between your thighs in a bright pink sack. You pick them up and hold them, startled by their new heft within grasp. They seem almost big enough to be on a farm animal. Oh wait...
"Shit! He's actually doing it!" you exclaim and turn to run, but you slip in cow dung and do an agonizing split in the middle of the field. You take deep breaths and then sit up to take stock of your injuries after your massive fall. Thankfully the shock and pain seems to be wearing off, but you do feel an odd throbbing near your forehead. Reaching up, you detect a couple of hard cones jutting out from the sides, starting to become a tad larger as you rub them. You want to release some choice profanities at the discovery of your new horns, but all that comes out is a bellow. You can't speak anymore? Will you ever be able to speak again?
How could you have known that the genie was going to transform you anyway even if you didn't make a wish? That's so unfair! You feel a funny feeling in your genitals again, this time like your penis is getting swallowed up by something warm. You look down again, and your dick is gone! Or at least, you don't see it anymore, not at first anyway. You can still feel it inside its warm place somewhere, and it seems to be hardening up and stretching wherever it is. You feel something growing long and firm within your abdomen, starting somewhere down near your balls, and you realize your dick is inside you! You can even see the outline of it under your skin as it grows up, up, up along your lower abdomen toward a strange new opening in your belly. Some shaggy hairs grow out around this new opening--the tip of your sheath, it turns out. The pink dick that slips out of it makes you moo again at the sight. You've never seen one of these before, but you suspect it's exactly the right tool for impregnating some of these cattle. If the genie thinks you're actually going to stoop to that level, even with a bull's penis, he's got another thing coming! (Or so you think, so far.)
You try to shove your pink member back down into your sheath to get it out of your sight, but the stimulation just makes it stick out farther. Before long, you're fingering it just for the sheer pleasure of doing so. You begrudgingly admit to yourself that it's much more sensitive than the human penis you arrived with, the one you need to get back somehow. You barely last anytime at all before you're huge balls tighten, your insides lurch, and your first bovine load comes firing down the barrel of your new artillery, splattering on the smelly ground beneath you while your eyes roll back in your head. Another loud bellow spills out of your mouth like a foghorn. Your left out of breath as your dick resheaths itself under your heaving chest while you struggle to catch your breath. Does sex get anymore intense than that? You don't want that to have been the best orgasm of your whole life so far, but you're having trouble thinking of a better one. You see fur growing on your belly and gulp at the implications.
Your ears twitch, and you're surprised to feel how much bigger and rounder they've become. They must look just like the ears on these cows here. They seem to have a propensity for flexing around, too. You can't believe the genie is ruining you this way, making you look less and less human as the seconds and minutes roll by. You could have wished for bigger muscles or something, made your fine human figure better. At least, you could have wished for something small that didn't change your life in any major way, if you were mostly satisfied as you were. But no, you had to scoff at the idea of a transformation genie, and now you're becoming his livestock!
You suddenly feel a weird pressure near your tailbone, then you feel an explosive release of sensation, and then a new length of fuzzy flesh resting on the ground like your legs are. You gasp and look back: behind you is a long, ropy tail with a shaggy tassel far away on the end of it. It takes no significant effort for you to make it lift itself and slap the ground behind you, hammering home the fact that this animal part is truly yours now. You reach for your new tail, grasp it with both hands, and hold it in your lap staring at your new appendage, nervously considering the prospect that you could be stuck swatting away flies like one of these cows for the rest of your life.
Your hands tense up, and you stretch them in front of you to watch them stretch out fuse into two-fingered pillars, whose nails thicken up into sturdy hooves. With few points of reference in a grassy field, you haven't fully noticed how large you're getting. When your legs have strengthened up to take your weight, and your feet have lengthened and grown new hooves on the ends, you lift yourself up on all fours and notice that you're as large as the largest cow here! Unsettlingly, some very embarrassing thoughts are running through your mind as some disturbingly tempting scents reach your growing nostrils. Your face is pushing forward into a broad snout that wants you to do something, something demeaning.