Ty noticed a popular clothes shop that sold lots of nice women's clothes, and realised something. If he wanted, he could use this power to find out what being a girl was like. He'd wondered about that for a long time, so getting to find out was a very enticing possibility to him. Plus, it'd be a nice opportunity to test his power.
First off, he wished no one there would think it was weird that a teenage boy was picking out the clothes Ty picked. With that, he wandered inside and picked out some cute clothes- a strappy top with a floral design, a cute yellow skirt, a matching bra and panties with a black and white spot pattern, some knee-high socks and a pair of sneakers. He didn't want to start off too extravagant, so he figured this would do for now.
Next, he slipped into a changing cubicle, locked the door and undressed. Instead of just taking off one or two things, he took everything he was wearing off, and put his boy's clothes in a neat pile in the corner. His heart raced as he saw his naked reflection, not just because of how taboo this was but from his anticipation of the next wish and how it would change his body.
He took a deep breath, and wished he'd turn into a girl version of himself and that the clothes would fit her. Before his eyes, his body rapidly reshaped itself from male to female. His figure shifted inwards and shrank in some points, particularly the shoulders, torso and height, and pushed outward in others, particularly the hips. His face became totally different, the contours shifting from masculine to feminine, the lips puffing out and the jawline softening, the neck narrowing and the bulge of the Adam's apple vanishing, his hair rapidly lengthening down his back. The texture of his skin transformed too, much of its hair receding away while it smoothed out. He noticed his nipples felt sensitive and turned erect as this happened, and soon they grew larger and puffier as flesh built up on his chest. Finally his penis shrank away while his balls pulled up inside him, until only a subtle mound with a vaginal slit nestled at its centre remained.
Ty looked at herself in amazement as she realised not only did she look like a girl now, she felt like she was too. Including feeling ashamed about her body being naked. She hastily dressed, pulling on the panties and doing up the bra without needing to work out how to do so. She pulled on the top and skirt, then pulled up her socks and did up her sneakers. She wished she wouldn't have to pay for these clothes and all the price tags would be gone, and thankfully they did.
With that, she left the clothes shop as if she'd been wearing this stuff when she entered, and no one even batted an eyelid. She felt ecstatic about this- she was really getting to be a girl!