Ty wished Jennifer would turn into a frog then quickly thought better of it and amended his wish to a frog girl. He'd get back at Jennifer for being so self-centered and mean by turning her into a freak.
Just after he did so, Jennifer looked around the room as if checking to make sure it was empty. Ty wondered if he had somehow accidentally revealed his presence, but it seemed unlikely. Having confirmed the room was empty (or so she thought), Jennifer removed her clothes to reveal a green bikini underneath. She stuffed her clothes in her locker and headed for a door out of the locker room with the still invisible Ty following. He enjoyed watching the jiggle of her butt and breasts as she walked. Jennifer exited the locker room and entered the large room with the school's indoor pool. She looked around and seemed happy to find the room empty before diving into the pool.
Ty smiled as Jennifer's decision to go for a swim would make the transformation all the more interesting. He was a bit curious why she seemed to be swimming in secret, but the reason became clear as Jennifer began to swim laps: she was a very poor swimmer. Ty watched and felt a certain amount of pity: this hot and athletic girl (he knew she was an excellent volleyball player) struggling to cross the pool. After one complete lap of the pool, she glanced around nervously again, worried that someone might have entered the room to watch her awkward strokes.
As she continued to swim (and Ty continued to watch), Jennifer's transformation began. Her hands and feet became webbed which soon improved her speed. Her swimming style also changed as her legs reshaped slightly to be more frog-like. Soon Jennifer was swimming at a pace to make the swim team envious. Finally tiring, she reached the end of a lap, put her hands on the edge of the pool, and sprung from the water in an fashion that would have been impossible before her transformation began.
Jennifer immediately realized something strange had happened the moment she made her leap. Her eyes went wide as she looked at her new webbed hands. Her hands and arms had turned a shade of green similiar to her bikini. Jennifer realized she was not standing normally and instead was squatting like a frog. Her legs had turned green like her arms and her webbed feet had stretched out to resemble the hind legs of a frog. Hopping over to the edge of the pool, Jennifer looked at her reflection in the water. Other than green lips, her head seemed normal. Her entire body below her neck had turned green, but other than her webbed hands and feet and frog-like stance her body seemed unchanged in appearance. Turning sideways, a closer looked suggested her breasts and butt were slightly bigger, straining her bikini. Her long black hair still hung down her back. Sticking out her tongue out, Jennifer found it was now much longer, although still relatively human looking. Struggling to stand normally, Jennifer rubbed her hands over her new green body and found her skin felt slimy like a frog.
Any moment now, Ty expected Jennifer to scream, to cry, to run out of the room. Instead, she did something he hadn't expected at all: she smiled. Diving back into the pool, Jennifer swam blissful laps in her new frog form. Ty was really confused. He had to find out what was going on. He waited for Jennifer to finish her remaining laps and hop out of the pool again. When she stood up, Ty made himself visible again.
"Hey! When did you get in here?!" she asked.
"What does it matter?" Ty responded. "You're a frog!"
"Yes, just like I've always dreamed! And I can finally swim like I've always wanted to."
Ty was dumbfounded. "You're happy I wished you into a frog girl?"
"You did this?" Jennifer asked. "How?"
"Uh...it's a long story. Lets just say I have magical powers."
"If I wasn't half-frog I wouldn't believe you. Why did you wish me into a frog?"
"I was mad at how mean you are to everyone."
"Oh...but why a frog specifically?"
Ty thought about it for a moment and realized the silly truth.
"Because I've often thought about how much I'd like to jump you."
"You and half the school! But you're the one who turned me into a frog so I want to reward you."
With that Jennifer grabbed her bikini top and awkwardly (due to her webbed hands) pulled it off, revealing her pert green breasts and darker green aerolas. Then she slipped her webbed hands into her biking bottom and slid it down to the floor. Her crotch, like the rest of her body from the neck down, was now hairless due to her transformation. After giving Ty a good look, Jennifer stepped forward and pressed her slimy body against him and flicked out her new tongue to tease his ear.
"So do you still want to jump me?" she whispered seductively.