Kendra sat in class, only half paying attention her teacher's lecture. Math wasn't a very interesting subject, but she also had something else on her mind: her legs itching.
Kendra had a secret: though she looked like a normal human girl she could transform into a mermaid. But she didn't have complete control over the change. Usually for her legs to transform into a mermaid tail she needed to immerse her legs in water. And she could resist the change if she wanted to and focused hard enough. But if she went too long without transforming, her body would rebel. It wanted to transform and if she waited too long her legs would eventually transform into a tail even if she stayed dry.
Today she had gone too long. Kendra usually avoided this problem by soaking in the bathtub every morning before she left for school, satiating her body's need to transform. But today she had overslept and skipped her morning routine.
She knew what the itch meant: she had better transform soon or her legs would transform in the middle of class, exposing her secret to the world.
Finally she could take it no longer. Her hand shot up and she asked to go to the restroom. Her teacher grudgingly allowed her to go.
Once out of class and in class, Kendra needed to think fast what to do next.