Alice the Kangaroo watched as the door opened, revealing her kids, Matt and Nick, aged 16. The two boys were taken aback by the sight of a kangaroo standing in front of the elevator, but due to Dues Ex Machina (and writer laziness. Sorry it's the way I write.) they recognized the kangaroo as their mother. "Mom!" They both called out. "What happened to you?" "Well, if memory serves, on our trip to Australia I came across a weird shaman who cursed me because I stopped to soak my sore feet in an apparently scared pool. Honestly, some people. But anyway, ever since that trip I've had weird dreams about being a kangaroo, and today I actually turned into one. Isn't that something?" Alice finished her story and looked at her kids. "Well, that explains why you kept on waking up in the middle of the night" Nick said. "Yep, it sure does. Now let's get on to the mandatory transformations which are probably the only reason some people actually read stories like this. Yay, I love ruining everyone's day by breaking the fourth wall!" Alice shouted happily.
(Enough introduction, on to the TFs)
As Matt and Nick watched their mother, they failed to notice strange changes happening on the inside of their bodies. Matt's skeleton was slowly shifting around, while Nick's skeleton shifted and completly hollowed out, shrinking him a few inches. Matt's olfactory organs also gained a significant boost, and his audiary senses shifted and improved as well. Nick's organs changed around as well, and he even gained several new ones. After the internal changes, Mat felt something poking out of his pants. Carving a hole in his trousers with his new claws that replaced his fingernails, Mat found that he now had a white-furred cat tail. Meanwhile, his brother seemed to be shrinking, and was growing feathers all over his body. Nick's lips hardened into a beak, and he grew claws to replace his feet as his hands turned into wings. As Mat looked at his tail, he found he had suddenly gone deaf. Feeling up at his ears, he found that they were now furry and triangular and had moved to the top of his head. Looking in a mirror, Mat found that his ears were the same color as his tail, and that his eyes were now yellow. With these new eyes, Mat found his vision had improved as well. Elsewhere, Nick's transformation into a penguin was now complete. The two boys now stood in front of their kangaroo mother, examining their new bodies.
(A/N: Sorry about this, I just wanted a story where I could test an idea of mine. People, feel free to ignore this, as it might not cater to your specific interests. Feel free to add to it, but no male sex scenes please. Nudity is fine)