The next moment the zebra and soon to be ex-human stared in anticipation... and weren't disappointed.
With a fwoomp Joey's feet suddenly stretched out and expanded into two large furry paws. Complete with soft black heel pads and short little claws. "What... the?" Joey stared, just as his ears sprang up. He looked up in alarm and Jill laughed at his cute shocked expression while one of his long light brown ears flopped over.
"I-I'm a rabbit?" Joey looked on, confused, as a tail began to grow behind him. A long thick tail covered in the same fur.
"Nooooo, honey." Jill pulled the changing boy closer and grinned lustfully. "You're a sexy handsome kangaroo." With that, Jill leaned forward, grabbed Joey by the collar, and planted a long and sinful kiss on his lips, just as his face grew furry and began to press out into a kangaroo's muzzle. From there it was all downhill. As Joey continued to change and turn anthro, the kissing turned to petting. Soon the soon animals had their clothes off.
Now Joey was growing buff, muscular, and his abs were tightening into a six pack and his pecs were hardening to say nothing of his arms and legs puffing up as the zebra girl grabbed his long tapering red cock in her hand and guided it between her legs as she sat on top of him.
Soon Jill was riding the kanga's rocket wildly, bouncing herself on top of him in beastial arousal, and Joey was returning the favor with passionate fucking. The two bucked and ground into each other, even as Joey grew a little bigger, a little taller, and got even stronger. Soon he was an athletic kangaroo morph with big strong legs.
The two picked up their intercourse and the zebra found herself gasping for breath, trying to keep up, as the virile roo hammered her harder and harder. "J-Joey!" Jill gasped. "I-I'm gonna... gonna... HNNNNNNNNGH!" With that, the zebra began to convulse on top of him.
Sweat drenching through his fur, Joey marveled at his new body and how good it felt, as the sensations became overwhelmingly wonderful. Just as he felt orgasm about to release from within him, the elevator light lit up.
"O-Oh!" Joey stared, and as the doors swung open he blew his load into the zebra right in front of Sara and Toy!