Ty grinned as Dustin shut his door and locked it. Shrugging Ty went back to his room and looked himself over in the mirror. Stripping his clothes off again he looked over his lightly muscled form. "Why stop here?" he asked himself. "I guess I should see how else I can transform people besides making them older or younger."
His head swam with ideas- turning into monsters or animals, creating things from thin air- but one that really stood out to him was changing sex. His underdeveloped state as a boy had made him wonder how he'd look as a girl, since sometimes he felt closer to one than a boy. Now he had a chance to find out!
Ty stared at himself in the mirror, took another deep breath, and said, "I wish I would become an average developed and beautiful 15 year old girl.' Again he gasped, both his fingers and toes clenching involuntarily, and he felt the change take hold. It felt even more intense than growing had, and his eyes widened as he saw himself transform before his eyes.
He shrank back down steadily, turning from 5'8 to 5'2, and his toned muscles vanished, but his proportions didn't return to their former scrawniness. Instead, he saw soft curves emerging- his hips widened, his torso shifted inward and his shoulders narrowed. The wispy hair that had flecked his body sank back into the skin, but without it it didn't look childlike, but pretty. Shivers ran through his face and his eyes squeezed shut; when he opened them again, he saw soft cheeks, a smoother jawline and puffier lips had formed.
Intense tingling sensations filled his chest and crotch, drawing his attention to them. He exhaled in surprise as his nipples enlarged and felt sensitive, and saw warm, soft flesh swell around them until it hung from his chest. New sexual instincts were emerging to accompany them- imagining someone cupping his new breasts and sucking his nipples made Ty deeply aroused.
In response his penis started to recede, his testicles shifted back inside him and his scrotum tucked up to almost become flush with his crotch. Ty expected this part to feel like becoming underdeveloped again, but instead it felt like being redeveloped. Inside Ty a womb formed and started to forge a vaginal tract, and the testicles connected up with it and formed ovaries. Outside Ty the penis shrank away into a tiny, sensitive clitoris and Ty's scrotum separated along its seal to form labia, which the vaginal opening joined up with.
As the changes finished, Ty looked at... herself. It seemed odd to realize she really wasn't a boy now. Her brain had adjusted instantly, thinking of herself as female and going by her. But she really loved how her girl's body looked. She felt so pretty, and she was sure any boys who saw her would agree.
She wondered what to do next...