"Well, first off I guess I wish I was back home and no one would disturb me," Daniel smiled. Sure enough, the world seemed to shimmer around him, and after a moment he found himself back in his bedroom, the house empty. He felt relieved to see for sure that the wishing stone had worked.
He paced his room, wondering what he might wish for with this power. One idea stood out most to him- Daniel had always wondered what it would be like if he was a girl, so he decided that that would be his first wish. Pulling off all his clothes and standing naked in front of his closet mirror, he breathed in deeply and said, "I wish I would turn into a female version of myself."
A warm, tingling sensation ran through his body, and when his eyes closed for a moment, he saw a vision of a penis ejaculating and a sperm moving inside an egg. The chromosomes of the sperm seemed to pervade the egg, and he realized the wish was altering his body from the moment it began to exist.
The changes rippled through Daniel's body and felt so sensual he could only focus on a bit at a time. He saw and felt his figure suck inwards and his limbs turn more petite; his body hair mostly vanished and his skin turned smoother; his figure altered so he had narrow shoulders and wide hips. His facial features reshaped as his jawline softened, his cheeks rounded and his lips turned puffier, his voice increasing in pitch as his larynx shrank and his neck narrowed.
Things intensified as the change's effect took hold in his genitalia. His nipples grew sensitive and practically doubled in size, the mammaries which he had never developed as a man forming now she was to be a woman. Before his eyes his chest swelled outwards, growing from flatness to pert C-cup breasts. Cupping them curiously, he gasped with pleasure at how nice it felt to touch them.
He looked down to see his shaft had slowly begun to recede, growing more sensitive as it shrank. His testicles moved up inside him and formed into ovaries, and his scrotum became almost flush with his crotch and its seam unfurled into the lips of a vagina. What had been a phallus took root above it and formed into a clitoris.
While the changes to Daniel's sex finalized, they also took root in his mind. Language seemed to shift around to fit this new self- Daniel was now Danielle, he became she, not male but female, a man who had turned into a woman. She felt herself accept castration and embrace femininity.
Once she could focus again, Danielle stared for a moment at her transformed body in the mirror and smiled at how much she preferred it to being male.