Jon shifted in his sleep, dreaming of lazy days on the beach, before school started. As he slept the changes started. His entire body shrank a little, and took on a decidedly feminine shape. His chest expanded into two perfectly formed, reasonably sizable breasts, and he rolled over onto his back to alleviate the discomfort of sleeping on them. Down below, his groin rapidly changed, and in a few seconds he was medically female. Her limbs grew slenderer, and her face softened into that of a teenage girl. Her hair lightened to a honey-blonde and grew very long; if it were hanging straight it would have reached down almost to her waist. She was now indistingushable from any other girl her age.
Then a second change started. Subconsciously, she felt a cramping in her legs and pulled them close together, but not before working her boxers off with one foot. She remained asleep as the flesh on her legs began to grow together, joining and enclosing them in an unbroken covering of skin. Underneath, the bone structure was changing, the leg bones being dissolved and absorbed by her body as her coccyx un-fused, new vertebrae forming all down the length of her new tail. Her pelvis remained the same, leaving her with vestigial hips that provided an anchor point for her tail muscles, but otherwise nothing remained of her human legs. Her feet changed as well, the ankles and heels being dissolved and absorbed by her body, the metatarsals and toe-bones turning into soft rays as what was left of her feet became thinner and thinner, finally flattening into delicate, flexible fins. Finally, iridescent emerald-green scales sprouted all over her lower body, and the change was complete. Jon the mermaid shifted position, trying to get comfortable with her new tail, before drifting back into dreamless sleep.
