Jake winced when he saw what was in the shopkeeper's hands. It was a pair of hair clips, exactly like the kind his little sister would have worn. He tried protesting. "I'm not going to put those on!"
He sounded just like a little kid. He could hardly blame the shopkeeper for grinning mockingly. "Oh yes you are. I'll just put them on you right here..."
Jake tried swatting him away, but was surprised to find that Derek had pinned his arms to his sides. Jake's scrawny new arms, covered in blotchy freckles and with just wisps of black hair, were no match for his now-father's grasp. He winced as he felt the new accessories clip into place and tried to twist awkwardly away from the mirror so he wouldn't have to watch these new developments.
But Derek was too strong. Jake found himself staring directly at his own reflection as the first of the changes kicked in. His already softer features were beginning to soften further. His nose was already shorter, his chin less prominent, his cheeks swelling slightly under widening eyes. The part in his mousy brown hair was shifting toward the center of his scalp, and every strand was gradually lengthening even as he watched. It covered the bottom of his ears and crept slowly towards his shoulders, but other changes had already arrested his attention. Derek was begin to tower over him even more as he shrank down in height. He couldn't have been more than five-three or so. He groaned as he felt his hips push out and his thighs swell slightly. They touched each other and rubbed awkwardly against his penis, which he felt less and less with each passing second. His butt swelled, and he looked down to see his pant legs inching upwards and beginning to fuse together. They looked for all the world like a khaki skirt, now, and stopped just above his knees, now hairless along with the rest of his legs. His shoes and socks had changed without him noticing. He was now wearing tiny black pumps with decorative buckles, and the lace of white anklets poked out over their rim. His shirt, too, had disappeared. He was wearing a light blue sweater that suddenly grew a turtleneck.
Just when he thought all was finished, he felt the two most crucial changes. His penis, already tiny, was abruptly gone, and he knew exactly what had replaced it, even without feeling. Out of nowhere, too, the front of his sweater began to swell as two mounds appeared on his tiny new chest. They were supported, he felt, by a bra that was invisible right now but would surely be there when he took this sweater off. His brown hair reached just down past his shoulders and stopped above his new breasts, almost as though drawing attention to them.
He looked in the mirror, and a high school girl looked back at him. She was cute, but very plain. She -- Jake -- still had his new freckles and dull brown hair and eyes. She had a weak chin and a chubby face and body. Jake couldn't imagine walking around like this, never mind his new parts and clothes.
Derek couldn't have been more pleased. "A daughter! Perfect." He turned to the shopkeeper. "I would think, though, that little Cara here should be in school at this time of day. Do you have any place I might send her?"