Laylee, the purple-furred bat, loved what was happening to her. She felt both of her wings bulging and growing, gaining weight and size and mass. She felt her arms mutating and transforming, and she loved every second of it. Laylee felt new nerves forming in her changing limbs and how they ached with pleasure. The pleasure flooded her brain and made her giggle and cum.
Both of Laylee's wings transformed. From her elbows up, her arms were no longer wings, but instead copies of her own torso. These new torso-arms had big breasts like she did, they both had plump bellies like she did, and they both had hard, throbbing cocks and fat balls like she did. Each of her torso-arms had a purple-furred head with large eyes and a big red nose just like she did. When her torso-arms looked at her, she looked back and orgasmed in bliss. 
Laylee's torso-arms were a beautiful and perfect mirror of her own. It was like looking at two other Laylees.
The sensation of cumming made her head swim. It was a pleasure unlike any other. Sperm flung from her cock and the cocks of her two torso-arms. All of her bellies fattened and grew, big and pregnant. Laylee had never been so happy in her life. Her heart was pounding, her blood pumping, her brain on fire.
"Y-You're a beautiful sight," Laylee gasped, and the two Laylees nodded.
"So are you," the two of them said.
The three Laylees continued to watch each other, their bellies and cocks pulsing and swelling as they came and came and came. Their bellies grew heavy and full and taut with a lifetime's worth of cum, and they didn't care. It was the happiest moment of their lives.
Then the three of them heard something behind them, and their heads turned. It was Judy Hopps. The bunny had stumbled across Laylee and saw her.... and Judy's arms were already beginning to transform.
Judy screamed. She couldn't help it. She had watched as Laylee's arms had turned into new versions of herself, and now she was watching as her own arms began to mutate.
"What's happening?!" Judy wailed. "Make it stop! I don't want this!"
"B-But this is... this is the best feeling in the world!" Laylee told her.
Judy didn't listen. She ran off and didn't stop until she was safely back home, her arms still mutating and morphing and changing.
It was only after the transformation had finished that Judy realized her arms were no longer her arms, but instead two smaller versions of her. They were smaller Judys. But they had bigger breasts and bellies. Her own clothes were feeling tight as her arms were making her grow.
"Oh my god," she gasped, "What is this?"
"This is amazing!" the little Judy said.
"I've wanted to be born again!" the other Judy said.
And they both giggled and began to make out with each other, their bodies growing and fattening with the same pregnant look that the Laylee had. Their bellies were huge and swollen and round, and their breasts were big and bouncy.
"W-We're not done, yet," the real Judy said, her heart racing.
"Not at all," her two little clones said.
They were all standing by now, and their bodies were all bloated and plump, but they all had huge, throbbing cocks and big, cum-bloated bellies. They were all pregnant.
"We have to do one more thing," Judy said, and then she began to jerk off.
Her two clones followed her example and soon they were all cumming together. And as their bellies and chests swelled and expanded, their bodies became larger and fatter and more powerful. They grew bigger and stronger and their cocks got thicker and longer. 
"We have to infect Nick..." Judy said.
"Oh yeah..."
"That sounds like a good idea."
"Come on..."
"Let's go, let's go."
"Let's hurry."
And they ran out of the house, their fat bellies wobbling, their heavy tits jiggling, and their huge cocks throbbing as they made their way back to the fox that had started this all.
Nick and his family were sitting down for dinner when they heard a knock on the door. He answered it. Judy and her two clone-arms were there.
"Oh, hello Judy, how are you—"
Judy shoved him out of the way, her arms grabbing at his clothing, her two clone-arms pushing his parents out of the way. She grabbed his shirt and tore it open, revealing his furry chest. He was already growing beautiful breasts.
"Wh-What are you—"
"We have to give birth," Judy said, "And we have to start with you."
Nick's parents watched in horror as their son was dragged out the front door by his arms, his pants yanked off, and he was thrown into the front lawn. Then they watched as his body began to morph and change, his bones shifting, his fur rippling, his body growing bigger.
"N-No... Judy, no..." Nick said.
Judy climbed atop his belly and straddled his body. She put her arms on his chest and began to rock back and forth, rubbing her fat ass against his belly.
"O-Oh..." he moaned.
"I'm going to give birth," Judy whispered.
Nick's body began to morph and change. His hips shifted, his belly shrunk, his legs began to transform. His whole body was being reconfigured into something new and exciting and wonderful.
"Ahh... Judy..." Nick gasped.
"Oh Nick..." Judy moaned, rubbing his soft, furry belly, "I'm going to give you so many babies."
Nick's cock swelled, his balls tightened. He could feel his body growing and changing. His bones were shifting, his muscles were rearranging, his whole body was changing into something different. Something amazing.
"I can't stop this," Nick gasped.
"Don't stop it," Judy purred.
Nick's belly swelled and grew, his hips widened, his chest filled. He was getting bigger, heavier, fatter. His fur was growing, his bones were getting thicker, his muscles were bulging.
"It's happening," Nick gasped.
"Yes," Judy moaned, rubbing her ass against his belly, "You're giving birth."
Nick's body was changing. He could feel his body growing and stretching, his fur spreading, his muscles expanding. He was getting bigger and heavier, his fur thicker, his muscles larger.
"I'm gonna cum," Nick moaned.
"Mmm... Cum, my love," Judy said, grinding her ass against his belly, "Cum."