I move the wand across the air, casually thinking how could be to have a brother instead a sister.. and something magical happened.
A bolt hitted my sister Jennifer, and she started to change before my eyes!
First, her breast deflated but the entire chest expanded.. a male chest?! The dark hair growing over makes that unmistakably true, as the fact that her arms and legs are thickening and covering as the same way with hairs.
Then, her face. Her hair shortened, leaving her beautiful and long blond hair in a crew cut. Her jawline becoming more angular, her eyebrows thicker and bushier, and her chin and cheek covering with a stubble, and on growing beard, indeed.
And last, a big bulge pushed in her crotch area, while her shorts and her t-shirt adapted to her new frame.
Her step-sister Jennifer's gone, now here is Jim, her step-brother!