Hearing Jill and Sara panting with hunger for cock planted a wild idea in Joey's head. With his shaft otherwise occupied by Toy's mouth, Joey's newly bisexual brain decided there was no such thing as too many cocks in his new Zoo. In between pants and gasps as Toy licked up and down his member, Joey wished under his breath that Sara and Jill's pussies would transform into cocks.
Jill and Sara, still gasping for breath with their faces next to each other's pussies, were too distracted to hear Joey's wish, but both shivered as they felt the magic wash over them. Jill's clit suddenly felt like it was on fire, and the Zebra girl began grunting and bucking her hips in time with the pulses of pleasure coming from her tiny button. Or at least previously tiny. Sara, with her head next to Jill's dripping snatch, watched as Jill's nub of a clit puffed up, swelling to the size of a large cherry. Sara could actually see it throbbing as it grew, and wrapped her long prehensile tongue to massage Jill's growing organ, stroking it as it grew. Jill moaned loudly as she felt her clit seem to harden in response. Sara felt Jill's clit swell larger still at her tongue's touch, and began bobbing her head up and down, wondering how big she could get it to grow. Each time she bobbed, there was more and more of Jill to swallow, until the organ filled her mouth. Pulling her head back to inspect her handiwork, Sara saw that Jill's clit had grown until it was roughly the size and shape of a soda can. Running her long tongue over the tip of this flesh protrusion, Sara watched as the tip flared, becoming a mushroom shape that Sara recognized well after her time with Toy, and a small hole opened up and began leaking clear fluid.
Realizing what Jill's clit was becoming filled Sara with renewed hunger, and she redoubled her efforts with gusto, relishing the feeling of Jill's cock growing longer and thicker with each throb. Jill meanwhile was in heaven, not yet comprehending the alien feelings coming from her nether regions, but she blissfully enjoyed the novel sensation of her lover's long agile tongue teasing her throbbing button. With each throb, Jill almost imagined she could feel her clit pushing outward, deeper and deeper into Sara's mouth. Eventually she was puzzled to realize that Sara's tongue was somehow tugging on her clit. Looking down, Jill watched as Sara pulled her head back, and her clit appeared. And appeared, and appeared, and appeared. Jill watched in astonishment as a half a foot of thick dark shaft emerged from Sara's mouth, before disappearing again as Sara took the full length back into her mouth again. And again. And Again. And each time Sara pulled back a little further. Jill felt her clit throbbing and stretching, yes stretching in time with Sara's motions. She hadn't been imagining the feeling, her clit really was growing. Even as she watched, it doubled in length to a full foot, thick and solid. In fact it was starting to look a lot like... a cock?
Jill was till trying to process this realization when her attention snagged on something else. Sara's own clit had lengthened, and was not sticking our of its hood, dangling limply. Looking closer, Jill guessed it was about two inches long, with small mushroom head at the tip. Jill felt a twitter of excitement at the sight at Sara's tiny cock-let. Licking her lips in anticipation, Jill took Sara's member into her mouth, running her broad tongue over it's length. Sara moaned, feeling her clit-cock hardening and swelling against Jill's tongue. Sara realized that Jill was not the only one changing, and the thought of growing a cock of her own thrilled her immensely. As this was all the consent the magic needed, Sara felt her push out even longer, once, twice, three times. Jill felt every inch of the growth in her muzzle, until she felt Sara's swollen member tickling the back of her throat. Jill wondered if Sara's cock might be longer than her own. As if spurred on by this unexpected challenge, Jill's cock pulsed. Jill felt a pressure building inside, before the dam broke and she felt her cock stretch longer and longer in one long continuous spurt. Sara felt the head of Jill's member move past her throat, and moaned as Jill's shaft continued to slide further and further down her flexible neck. Jill similarly soon found herself deep throating Sara's lengthening member.
Jill squirmed as she felt things moving inside her abdomen. A hard object suddenly dropped into her birth canal, and Jill instinctively began to grunt and push the offending object out of her body. The object tunneled its way through her, and Jill could feel it pulsing larger and larger. Afraid it might get stuck, Jill pushed harder and harder. Just as it reached the end of her vagina, Jill's labia sealed up. Panicking at the thought of the object being trapped, Jill pushed harder than ever, until with a plop the round object dropped out of her birth canal, stretching her fused labia into a sack that cupped the still growing object. Jill moaned in relief, feeling a tickle in her throat as her voice cracked before settling into a lower register than before. Jill felt a second object, drop and rapidly repeated the process of expelling the mass from her vagina, voice cracking lower still. No sooner did the second object drop into the waiting sack, then Jill felt her vagina seal itself up behind it. Jill realized that her ovaries had just given "birth" to her new testicles. She moaned, enjoying the sound of her deeper, huskier voice, as her testicles churned, producing prodigious amounts of waiting sperm. They swelled from the size of golf balls into two fat oranges, sending waves of testosterone flooding through her body. Jill felt a series of cracks and pops run up and down her spine as she grew several inches taller, followed by a pulling sensation as her shoulder widened slightly. Blood flowed into her muscles as they pumped larger and larger, as her build shifted from curvy to something more athletic.
Sara quickly followed Jill's lead, her ovaries dropping one after another into her newly formed sack before swelling into a pair of plump balls to feed her still new cock. Her grunts and moans deepened, as her voice shifted registers and her secondary changes began. Her growth was even more impressive than Jill's, the already towering giraffe girl stretching another foot, lengthening neck supported by broadening shoulders. Her already toned muscles swelled larger, her frame losing some of its leanness as it strengthened into something not out of place on a champion runner.
Both Jill and Sara continued to suck enthusiastically. Both felt a pressure growing behind the head of their cocks and a tightening in their balls, until with louds moans both cocks erupted, flooding each others throats with what felt like gallons of cum. Jill and Sara felt their minds go blank for a moment, lost in the pleasure of their first male orgasms. Panting, both girls stood slowly, and admired each other hanged bodies, pleased with the muscular, large breasted, well hung shemale forms they'd been given.
"Oh God, and I thought having a cock inside me was good. That was amazing!" Sara groaned.
"Mmmmm, you don't have to tell me. But as delicious as you are, my cocks hungry for something... different." Jill replied, casting a lustful look at Joey and Toy.