The dictaphone

Lilly looked at the dictaphone, thinking about her next move. Yes... she knew what she needed. Amber had always been running ahead of her? Her stepbrother said she wouldn't ever win a competition? Hell, if the girls went crazy before her with the power of this device, she'd be stupid not to do the same. She didn't want to be good. Or excellent. She wanted to be the best. Ever.

And this device could give it to her. She just needed to know how fast she wanted to be... she smiled as she noticed another reporter now in front of a zoo on TV, listing all the things to do around town today. Lilly pressed the record button.

"I'm Lilly, the girl known to be as fast as a cheetah."

Hell, cheetahs were damn fast, so she bet she was going to explode world records this way. She heard a sparkling sound around her, then her skin tingled. She expected to feel her legs get stronger or to magically become super fast, but instead, she looked at her arms and noticed... a dark spot on her right wrist. Then another one, smaller, appearing under it. And another one farther. She noticed both her arms were covering in dark spots.

"Oh my god, did I just give myself some weird sickness?!" she said to herself in shock, wondering why it worked well for Vanessa and Amber, but not for her. She wanted to press the erase button, but when she tried to move, she lost her balance and fell on the floor, panting. Her whole body was tingling now. "Oh god I..." she then noticed she didn't hear the end of her own sentence. Was she deaf? She patted her ears, and only found hairs there! No more ears! What the hell... "is happening!" she suddenly heard loud and clear. Wait, her ears weren't back, so how could she hear again? She patted the top of her head... and found there two small, fluffy round feline ears there, moving naturally as she touched them. She looked again at her arms, and noticed how her skin was now lighter, with dark spots... exactly like a cheetah.

"I'm turning into..." she started, but this time, she coughed as she felt her lungs growing inside her rib cage. This enlarged her chest to give space, as she felt her heart growing too, and on her enlarged chest, her breasts grew in proportion, giving her a large pair of C cups nicely molded in her running top. At the opposite, her waist was getting thinner, and it seemed almost empty, moving fast with each of her now longer breaths. Her hips enlarged slightly under it, and eventually, she felt muscles growing stronger down there, and even some appearing, growing, her legs not changing much, but she could definitely tell she was now stronger down there. Eventually something pushed in her panties, and threatened to rip the back of her running trousers.She didn't need to ask what it was, as a hole appeared in her back, and a thin tail, with short yellow hairs and dark spots grew behind her. It was around 2 feet long when it stopped growing, and Lilly realized her balance was back. Her tail was moving naturally and helped her move up. The change was over.

With cautious steps, Lilly walked to the big mirror in the patio and looked at herself.

She was still 5'7. At least, if you didn't count the two cute round cheetah ears at the top of her head, circled by her long hairs. Under them was her face. Her skin hadn't changed there, it was just a bit lighter. She only had dark spots on her arms, legs and back. Just like a cheetah. Her 2 feet tail moved slowly behind her, and her ears trembled each time her fingers were too closed to them. She opened her mouth, and noticed her canines were pointier and a bit bigger now. She guessed she like her steak extra rare now.

As she looked lower, she saw her now C cups moving up and down quite a lot as she seemed to have much bigger lungs to push them now, and even her heart felt bigger, beating louder. And the waist had never been so thin. Under it, attached to her slightly larger hips, powerful legs were ready to be used. And last thing : she could see every detail about herself and smell the plastic of the water bottle still in the kitchen. Looks like she had the senses of a cheetah now, too.

"Oookay... this is... surprising to say the least." she said.

She then noticed a pair of goggled hanging near her jacket in the patio. She grabbed them. They looked like high-quality goggles belonging to someone biking or...

Memories then started flooding, adding to her own.

She had always been a cheetah-girl. His father was a biologist and wanted to give her daughter good genes through a bit of manipulations of his own... but he didn't expect his daughter to be born with cheetah traits. The reason why her mother left him.

"Wait no... my dad was just an office worker!" she whispered to herself "Mom left him because of his gambling debts..."

But more memories were flooding. She was called "Lilly" because of "Tiger Lilly". And this led to some people nicknaming her "Tiger Lilly" despite her telling them she had cheetah genes, not tiger. But even if people found her weird... she was able to run so fast it was dangerous to her when she was a child. She wore goggles when she did, because of the speed. In a straight line, she could reach up to 75 mph, and her record was at 77 mph on a good day. Her bedroom was full of all the trophies she got. When she was in a competition, people knew it was over. They fought only for the second place, because when they finished running, Lilly was already sat, drinking while waiting for them. She was 17, but next year, she'd be officially old enough to be in the US Olympic Running team, and the world knew it'd mean the competition would be messed up for years until she retired.

Lilly got out of her thought because of a weird sound. Wait... she was purring?

She laughed it off. This was GREAT!

"Thanks, little device..." she said, walking back to the kitchen to grab it, her tail waving slowly while she walked sexily...