“What was that this time?” Maria gripped her head as she sat up on the ground, still dizzy from the sensation earlier that had coarse through their entire body this time. 

“I do not know but it must be the same reason for the other change.” Amber rubbed her butt. Her voice had changed from excitement earlier being happy with her breast growth to concern as it looked like it might not stopped. 

“Holy shit!” Maria gasped. “You are taller!”

Amber looked over her body to see what had happened during their time wiggling on the ground from the tingling experience that they went through for two minutes. She was definitely taller, a lot taller. She was now 7 feet tall with only her panties on as the rest of her clothes ripped off during the growth. This growth and previous growth were clearly visible as Amber stood up to see and touch her new body, her new measurements were 48 26 38. It was also obvious to see another set of tits were starting to form a small mound with their own nipples underneath her already existing tits.

“You are bigger too.” Amber yelled down as she was shaking her new bust.

Maria stood up to observe her new growth as well. Her tan body glowed as she twirled around to see all that was new. She was naked as well except for her panties but stood at 6 foot 6 inches compared to Amber, her measurements were 67 36 46. Maria also had a second set of boobs growing underneath her big existing ones already. Their measurement was 30 B-cup with some nice stiff nipples on them. Maria bounced a whole lot more as she did circles to look at her whole body.

“Do you think someone is doing this to us?” Maria asked Amber worried that someone was manipulating them for their own pleasure. She was leaning forward with her hands in a fist with her elbows squeezing her boobs in and her butt pointed out. 

“I definitely think someone is.” Amber put her hand underneath her chin to ponder what was going on. They were paying no attention to the stream right now as it had grown to 2000 viewers. Amber was now on the same line as thought as Maria was on this sudden growth, concern for who was doing this. “It has to be magic or something.”

“Then what is it?” Maria begged Amber. “Who do we know can do magic or something like that?”

“I believe I--” Amber was cut off as both her and Maria grabbed their mouths as the tingling sensation exploded inside their mouths.

“Let us fix that mouth problem of yours.” Alex clicked on his phone the command.

Mabel twitched and shook her head with her mouth opening and closing slowing to adjust to the changes the nanobots were doing to her mouth. Alex had given her some experiment food that had burned the inside of her mouth that left burn marks on the inside and the tongue. She had lost a lot of the roughness due to that food that she could not properly clean herself because of that lost. Mabel stopped twitching as the nanobots had finally done their work.

“Coming here.” Alex put his hand down for Mabel.

Mabel came and rubbed her head against his hand to show affection and began to lick.

“It worked.” Alex smiled as he felt the roughness of Mabel’s tongue return to it’s old healthy state. Alex was enjoying this happy and affectionate Mabel. He was a cat person.

“Now, what to fix next?” Alex looked over Mabel’s body to see what other thing or injury that he could fix with the nanobots.

“Bwat was fthwat?” Maria said as she was trying to figure out her new tongue.

“Must bwe the thwing I thought it swas.” Amber was better with her new tongue and mouth as she started to look angry as she believed she knew who was the culprit for their changes.

“Who iss it?” Maria was starting to get the hang of her new mouth as well.

 “Alex, he could do something like this to make us tall.” Amber put her hands on her hips. She was now used to her new mouth now. “Must be why he asked for our blood yesterday, he probably has a ray gun or sorts pointed at us right now.”

“That is horrible.” Maria gasped, speaking normally now. She was angry now as well at Amber’s little brother. “He is going to get it.”

“Yes he is.” Amber stomped towards her door and was going to yell his name when something unexpected happened.

“MMMMRRREEEEOOOOOWWWW!”

Amber stopped and turned herself around to Maria as both of them were surprised at Amber’s sudden meowing. Amber walked back to Maria as they were now confused and scared at the same moment.

“What was that?” Maria trembled. She grabbed Amber’s arms. “You just meowed like a cat.”

“I do not know.” Amber was grabbing her throat, trying to examine it. “But you try to meow as well.”

“Mreow” Maria meowed a perfect cat meow.

“I do not think this is Alex anymore.” Amber gripped Maria to try and calm her down. “Alex would never do something like this at all. It goes against his scientist code. I think it is magic. Nya”

“Nya, but who would do this sort of thing.” Maria started to have tears formed.” 

Amber looked up to see that the stream was still going on and everyone was witnessing the changes that were going on in these two girls' bodies. There were about 5000 viewers when it clicked in Amber’s head, this must be the source.

“The stream! NYA!” Amber yelled, she suddenly noticed the little addition she was adding to her speech but that did not matter now. “A viewer must be doing magic on us. Nya!”

“Your right!” Maria turned around and started to run to the computer screen to turn off the stream. “Nya, we have to turn it off!”

Maria barely made it to the desk when she gripped the sides of her head and stopped in her tracks.

“Ooh my head.” Maria groaned as she fell to the floor, grabbing her head tightly. Amber was grabbing her head as well but had fallen on her bed.

“There we go, as good as new.” Alex rubbed the head of the ginger cat. The ears on her head were now completely normal as it previously had some nip marks from it’s time on the street. He had not heard Amber’s yelling meow as his room was insulated to keep it quiet so he could concentrate on inventions. 

“Hmm, let us change your hair color as well.” Alex clicked on his phone for the new changes.

Mabel’s orange color suddenly faded away leaving her almost bleached white. She had a fine coat of white fur now. Mabel was looking over her body as she was trying to figure out what was going on as she definitely noticed her new color.

“It looks good on you.” Alex said, complementing the cat. He began to pet Mabel and she purred in response.

“I am glad that you are happy.” Alex smiled. He then looked at her tail that was scruffy and short from an accident that happened in her past.

“Let us see how we can fix that.” Alex looked in his phone to see what he wanted the tail to become.

“Nya.” Amber groaned as she sat up on her bed. She started to rub the top of her head as the pain went away. “That hurt.”

Amber paused as she felt something new on top of her head that wasn’t there before. She could feel two triangular shaped cones like things protruding from her head and those things could feel her fingers back. Amber felt one one of them twitch as she brushed her hand by it, she also could hear sound coming in from up there and instead of from the side of her head as well. Amber brought her hands down to the side of her head to notice that where her ears used to be was skin with some short hair growing there.

“MMMMRRRREEEEEEOOOOOOWWWWWWW!” Amber and Maria screamed a meow as they noticed the changes on their heads. Amber looked down at Maria on the ground next to the computer while Maria looked up at Amber on the bed. They screamed a meow again as they looked at each other. 

“MMMMRRRREEEEEEOOOOOOWWWWWWW!”

Each one could see what had happened to the other and presumed that the same thing had happened to themselves. Their hair had turned to a nearly bleached white with a hint of silverish grey to it. The most surprising thing was the set of cat ears that had appeared on top of their heads.

“This is bad, nya.” Maria stood up. She was rolling a stand of her straight upper back length hair to see her white hair while inspecting her own ears on top of her head.

“This is really bad, nya.” Amber confirmed as she rolled her legs over to face Maria. “We need to stop this before we turn into actual cats. Nya.”

“Do you think we would turn into actual cats?” Maria put her hands on her cheeks as she was terrified at that thought. She took a step back towards the computer screen.

“It is a possibility since we are dealing with magic.” Amber was starting to get scared as she was thinking about it more, the idea of being a cat. She quickly switched her mind to more positive thoughts so that she would not break down. “We just have to make sure some recognize that we were once humans and we have the chance of being human again.”

“I don’t want to turn into a cat.” Maria sat down on the desk with her butt facing towards the camera, tears began to form as she was stuck on that thought. “We are too young to die”

“We are not dying here.” Amber tried to comfort Maria as the fear started to sink in Maria’s heart. “I am sure that this magic will stop soon and we will be back to normal.”

“What if we don’t.” Maria did not buy Amber’s lie to try and comfort her. They were both worried about turning into a cat. “What if we stay being cats.”

Amber did not reply to Maria as they both perked up, something else was happening. The tingling sensation was now at the top at the back of their asses where the butt cheeks meet. They feared what was going to happen.

“It’s coming!” Maria grabbed her butt as the buzzing feeling became stronger. 

“Please, No! Nya!” Amber rolled on her bed, onto her belly, as she grabbed her ass as well. Maria could see what was going on with Amber as Maria sat on the desk.

From the camera’s view, Maria’s big tan ass nearly covered the entire view for all 15000 viewers. A bulge started to appear where the three straps of the underwear met up the back as Maria rubbed her ass to calm the weird experience. A patch of white fur started to spread out from the bulge to stretch the panties to be very tight. It suddenly tilted to the side as it found a way to escape the constraint of the underwear, the white tail popped out for the world to see it grow longer. It flopped, twirled, and twitched as it became longer and longer. Maria was moaning as tail increased its length and stretched her panties. She had enough of the pain of her panties stretching against her skin. Standing up, Maria pulled down her panties as she bent over on livestream, the tail went along with panties as it was caught in one of the holes. Her tail went straight up and flicked about as she stepped out of her panties with her naked ass to the camera. They could see that she did not have a shaved pussy but a hairy one, it had transformed from a tangled mess to become a nicely fur covered pussy. 

The chat of the stream was blowing up as Maria stood up straight again, after taking off the panties to have her regular white 52 cat tail for the everyone to see class with her honey brown skin. It was a sight to see as her tail moved around her fine ass.

“Is this happening for real?”

“It is livestream.”

“Are we getting real catgirls?”

“They look so hot.”

“This must be CGI and special effects.”

“I want to fuck one right now.”

“Catgirls to rule the world.”

“They look like they are in pain.”

“This is real! this channel doesn;t have the budget for special effects.”

“I want my own catgirl.”

Maria wasn’t paying attention to the livestream or the computer as she walked over to Amber who was laying on her bed completely naked like Maria was. Amber had decided to rip off her panties as her bulge started to form into her beautiful white 56 inch cat tail that was the same regular style tail for a cat like Maria.

“I think we are going to become cats, Nya.” Amber sniffed as her tail danced in the air. They did not know how to control it yet so it just moved practically on its own. 

“I think so too. Nya” Maria rolled over Amber as they had tears forming in their eyes. “I just hope someone turns us back.”

“That is all we have.” Amber sat up as Maria sat down next to her. They were facing the computer camera that had 30000 views watching their emotional breakdown. Amber and Maria were completely naked with their two sets of breasts showing, tails wagging, and Maria’s fur patch pussy and Amber’s clean shaven one. They were completely beautiful creatures being born and the chat confirmed it.

“Nya. We have to hope someone sees us as humans or partially human and could love us for whatever we become.” Amber hugged Maria as they initiated sobbing to drown in their sorrows.

“Hey! Stop that.” Alex's voice went up with discomfort as it retreated from Mabel as she hissed. 

Alex had tried to touch Mabel’s new healthy long tail but Mabel did not want that. Mabel was particular about her tail so she rarely let anyone touch it, even during pettings. It was part of her moody nature that the family had come to accept but not Alex, he continued to try to rub it from time to time to only get wacked by soft paw or nipped by her teeth.

“I guess liking me wasn’t enough to fix your attitude or personality.” Alex said as he rubbed his hand where he was rubbing a bite mark. “I guess I just have to change that so you will allow me to pet you.”

Alex went to his phone and began to change the personality of the hosts of the nanobots to be happier, friendlier, and playful. Once he had set that feature up, he executed the command. Alex waited as Mabel’s head tilted slowly before shooting straight back up.

“Now, I will try again.” Alex reached out to pet Mabel again. He had a positive response as Mabel leaned into his petting hand all the way down to her tail. She then moved in closer and rolled on her back to indicate that she wanted to play.

“I like this.” Alex got down to play with Mabel, they both seemed to have a great time after Alex changed the mind of the targets. 

“I guess I can fix the last thing now since I won’t get hurt now.” Alex said to Mabel.

Amber and Maria were crying in each other's arms at the thought of turning into a cat terrified them. 

“I don’t want to be a cat. Nya.” Maria sobbed

“Nya, I don’t think I could take it.” Amber whimpered.

They both stop crying for a moment as they could feel the tingling sensation in their head, inside their head. They thought that the magic was about to finish them off and turn them into cats, they were not completely wrong. They started to tilt their heads to the side as they began to download new pathways, ideas, and behaviors for their new personalities. It was like mixing colors together, the girl's mind was red and the nanobots were introducing the color blue to the mix. The color became purple, it could be considered as shade of red but it was now closer to blue. They were still Amber and Maria, mind wise, but there was a lot different about them now. Their heads went straight up as the download completed inside their heads.

“”What were we crying about?” Amber spoke first as she slowly pulled away from the embrace. she was finding out that her new brain signals were changing her emotions to happiness, away from sorrow they were experiencing earlier.

“Nya, It was about turning into a cat.” Maria confirmed as her sad emotions dissipated as well. She was trying to process stuff as well but new thoughts that she had never thought before kept popping up, her brain had been rewired but not destroyed.

“Oh, yeah, Nya.” Amber said as she remembered what they were doing before. Amber could recall the sad thought and memory that happened a moment ago but she was having a hard time trying to force herself to be sad or mad about it. All she could feel was happiness and playfulness

“What is your thought about, nya, being turned into a cat?” Maria asked Amber. Maria was going through a similar mental readjustment as well as she was becoming accustomed to her brain waves and patterns for her thought process.

Amber only thought over it for two seconds, she knew that her answer should be ‘no’ but her emotions and her reconstructed mind had a different answer.

“I would like to become a cat. Nya.” Amber smiled as her tail waved around behind her and her ears twitched in excitement. “I wanted to be a cat when I was a little girl.”

“Nya, Me too.” Maria smiled as well. Their minds still had access to all of their memories but habits, feelings, and ideas had changed. 

“What would, Nya, a cat do?” Amber asked but she already knew the answer but she wanted to see if Maria had the same answer.

“They would clean each other with their tongues, play together with a little rough housing, Nya, and lounge around a house.” Maria replied. “Nya, just like this.”

Maria leaned forward in their embrace and went to where Amber’s human ear used to be and licked. Maria’s cat tongue was combing Amber’s hair.

“That tickles.” Amber giggled at Maria’s tongue. “Some of you hairs are out of place over here.”

Amber licked Maria straight white hair in the back of Maria’s head with Amber’s cat tongue.

“Hey stop. Nya.” Maria laughed. ‘That really tickles.”

“Make me. Nya” Amber chuckled as she continued to lick the back of Maria’s hair.

“You asked for it.” Maria smiled. Maria brought her head to Amber’s armpit and nuzzled inside it. Once inside, Maria began to lick to tease Amber.

“MREOW!” Amber jolted straight up, her tail did as well with it fuzzing up at the tickling. Amber could do nothing as Maria’s onslaught of her tongue mercilessly scraped every inch of skin underneath Amber’s arm to tickle her. Amber was left a convulsing mess for thirty seconds as Maria tickled Amber with her tongue on livestream.

“Had enough? Nya.” Maria asked to a panting Amber. She was proud and happy with what she did to her friend.

“Not quite enough.Nya.” Amber smiled.

Amber lurched forward as she grabbed Maria by the shoulders to push her down. Maria landed on her back on the bed as Amber adjusted her hips to land on top of Maria waist, pinning Maria underneath Amber. Amber’s tail whipped back and forth in excitement as she was about to get revenge for what Maria did to her. The 60000 viewers had a side view of two catgirls with one on top of the other.

“I think it is my turn.” Amber started to purr with excitement.

“Nya. Do your worse.” Maria purred in response with her tail flickering underneath. 

Amber sat straight up on knees on top of Maria and looked at her hands, as did Maria as they lifted them in front of their faces. They looked at the tip of the fingers and the palm of their hands as pads started to form there. They stopped paying attention to them and turned to their feet as they felt a bigger change there. Maria lifted her legs up in the air to see what was going on while Amber looked side to side to look at her feet. Their feet and toes were getting longer as a second ankle appeared to be forming on the lower calf. Pads started to form on the underside tips of the elongated toes and soles as the nails darken, became conical and retracted into the toes. Amber and Maria looked back at their hands as the black nails sunk into their fingers. The pads were now more pronounced and obvious at white hairs started to grow on the hands, finger and arms until it became lush white fur on them. The same thing happened on the feet as the silk soft fur covered every portion of skin, except the pads, all the way up to right before the elbows and knees.

“This is interesting. Nya!” Amber brought her cat like hand to mouth and started to lick her wrist. 

“I like this. Nya!” Maria replied. She started to lick her cat like wrist as well. 

“Let us not forget what we were about to do.” Amber put her paws next Maria’s head. Amber extracted her claws and dug into her bed as she pulled herself closer to Maria’s head, not caring for the rips and holes she put in her bed.

“I still have to torment you for your teasing earlier. Nya!” Amber purred.

“I am ready.” Maria purred in excitement for this play time.

Amber began her onslaught of licking Maria underneath her as Maria’s cat legs and tail flailed underneath her. Gone was the sad concern of them turning into cats earlier, it was now time to enjoy their new bodies to the fullest as they behaved like playful cats would if they were tall human girls. They were completely happy with whatever came their way to transform them. They wanted to show the world, before this, that they were pretty girls that could outshine the genius that was Amber’s brother, Alex, and they were doing that in a way they had not expected. They had become beautiful creatures that the world was observing through their camera as they played together, laughing. The viewers was now way past 100,000. 

“Your claws are back and your paws are healed.” Alex said as he reclawed and fixed Mabel’s paws from injuries she acquired from living on the streets. Mabel began to stretch her new claws that had been taken away from her.

“You should be okay if I picked you up.” Alex picked up Mabel.

Mabel purred as Alex lifted her up in his arms and rubbed her white fur. Alex was very happy as Mabel had finally accepted to Alex even if he had to use technology to literally change her mind.

“I wonder what Amber would think about this.” Alex opened the door to leave his room and started to walk to Amber’s room.

He was about to knock when heard giggling inside Amber’s room. They must still be doing the stream right now and he promised not to interrupt them unless it was an emergency. This was not an emergency even though it was exciting that he had changed their cat with his nanobot techonology.

“You go have fun entertaining the world while I try to change it.” Alex smirked as he went downstairs to the living area. “I have a few more things I can do with Mabel.”

At that moment, Alex didn’t realize how much he was having a hand in changing and entertaining the world but Amber and Maria couldn’t register that they were physically entertaining and changing the world.