Despite having a body any man would kill for, Ty still felt like he wanted to change more. So he could change his body's proportions a lot, but there was something else he felt like he'd really like to try changing. He had been wondering for quite a long time about his gender- he had never really felt like he fit in as a boy, but knew his shitty foster family would never accept him if he tried to tell them he wasn't a boy. Now he could just use his wishes to see what life as a girl would be like.
And so, Ty wished to turn into a girl, and that everyone he knew would remember him as one, including him. Another warm tingling swept all over his body, and he pulled off his pajama pants, shirt and underwear, standing naked in front of a mirror as he transformed. His body shrank from the bulky, athletic form he had just given it until he stood at 5'5" again, but this time he felt less undersized and scrawny- this size felt right to him. His larynx shrank down and the pitch of his voice heightened to a feminine one. His figure curved and he soon had wide hips, narrow shoulders and a much more feminine look, his skin smoother, his facial features softer, his muscles and hands and feet more petite.
The tingling grew more intense and pleasurable as it now reached the point of making his most obvious male features female. His breathing quickened as his nipples felt sensitive and swelled up, and flesh slowly filled out around his chest, until he had formed soft breasts. Once these had developed, the sensations moved down between his legs, and a shiver raced through his penis and testicles. He watched his reflection and saw his balls move up inside him to form ovaries, the skin sac they had been inside reshape into vaginal lips, and his penis recede away as its nerve endings bound up tightly into a clitoris.
Once the transformation finished, Ty's mind seemed to adapt almost instantly. She thought of herself as a girl- she remembered being a boy, but there wasn't so much as a hint she had been one a minute ago. She looked in her closet and saw lots of girl's clothing. All her IDs and stuff had changed. Her friends at school seemed to be a bit different. Even her room had changed, a few posters were now for different stuff.
"Wow," she said in her girl's voice. "I'm really a girl now..."