As the process of his body's development progressed, Ty realised something felt strange. The sensations and instincts running through him felt different somehow. Almost instantly, he realised what had changed. He, him, his... those terms felt weird now, just like how remembering his life as a modern-day teenager did. Ty's gender was just another part of him that was being subsumed by his transformation into a pharaoh.
The second X chromosome the pharaoh's seed had given his egg was making its mark- the stage at which the signals that tell a foetus to develop into a male came and went, and Ty realised his body's development was about to invert itself.
Ty's vision of his body returned, and he saw it undergo a dramatic transformation. His facial features reshaped, his cheeks softened up and became unable to grow much hair (as did much of the rest of his skin), his lips puffed out subtly. He felt his larynx shrink into nothingness and his voice's pitch increase. His figure altered, shoulders slanting in and hips flaring out while his muscles turned lither and more petite.
Now came the changes that made Ty go from male to obviously female. His chest felt sensitive and his nipples pricked up and swelled, soft flesh forming and mammaries developing under them until large soft breasts hung from his chest. The desire to have them played with welled up in his mind. Further down, the changes were even more pronounced- his penis slowly shrank down into a clitoris while his testicles moved up inside him to form ovaries, his scrotum tucking inwards and forming a slit down its centre as it turned into a vagina.
In Ty's head, the change in gender had gradually taken hold while his body transformed, and now it was irrepressible. She was a woman now- royal blood had made her one, and she felt comfortable in a female body. She would be a pharaoh as great as any man.