<"hmm I have a sister?....." Yukiko says looking at Katie.>
"...or a brother? Yes... a brother, I wish to have a brother instead of a sister!"
In front of her, Katie looks confused, while the change begun.
Her blond hair receded, shortening to a crew cut. Here face gained male features, her eyebrows thickened, her cheeks and lips covered by a light beard and mustache.
Her tits flattened and her chest bulked up into muscular pecs. Her arms and legs hardened and thickened, becoming quickly more muscular. She felt a tingle, while her entire body covered by curly hairs. Then, her transformation finished. Katie felt strange, then spoke again:
"What I'm saying? Oh, hi sis!" Yelled Katie (now Kevin) in his new masculine voice.