The magic allows you to fit in with the girls, and perform as part of the routines, which is handy. Being one of the more curvy girls you are frequently the central character in the display.
Unfortunately, you feel uncomfortable as you perform the splits and other routines. Getting the girls frustrated with you. You also find that the attention of the boys distracts you too, making you more self-conscious.
"Come on Jane, concentrate!" you just wish you had the stone, and then you could perform the routine effortlessly.
Hah, forget the routine. You could have the football team drill you until you screamed out in pleasure you love of being a girl.
You realise what you were thinking, and flee back to the changing rooms. This female body is giving you female thought. You should be thinking of taking a harem of women, not thinking of tight male asses, and bulging crotches.
You slide to a stop on the floor, where you dropped the stone scratching your hands badly, as you scrabble for it. The voice of the teacher shouting behind you.
You feel it in your hand, as the teacher pushes the door open, it bounces noisily off the wall.
Jon now Jane makes her wish.