After a few moments to consider, Dexter decided he couldn't pass up such a fascinating opportunity. Wasn't challenging roles the whole reason he decided to take up acting? And after all, it'd only be on set he had to be a girl. "OK, I'll do it," he said.
"Brilliant, thank you so much Dexter," Mary smiled. "Or I suppose it'll be Delilah?" She gestured to Larry, and he handed her a box of pills with the GGC logo on it. "These are the Gender Switch pills. If you want, you can try 'em out before we start rehearsals to get a feel for things. Only if you want, of course!"
"Sounds good," Dexter replied a little nervously, and took the box of pills.
After driving home to his apartment, he wondered for a little while whether to try the pills. He felt like trying them would be something he had to do tonight- both for the convenience of the studio if he realized he couldn't deal with the Gender Switch, and to get it done with to put his own mind at ease.
Eventually he convinced himself to bite the bullet- or the tablet, as the case may be. He went to his bathroom with a glass of water and the box of pills, stripped off so the transformation wouldn't ruin his clothes (and so he could get a good view of what his body looked like- the curiosity was just too strong), and swallowed one pill with water.
Dexter started to feel its effects quite rapidly. An odd tingling sensation overcame him, which he could tell was the pill affecting his hormones. It must be converting them from male to female, replacing testosterone with estrogen. It would explain why he felt so weird- aroused, even.
It almost felt like a drug high, and while the comparison felt silly to Dexter for a moment, that feeling of silliness evaporated a moment later as he noticed his body physically start to change shape before his eyes. Everything seemed to shrink inwards- he became physically more small, which was especially noticeable with his hands and feet. A tingling all over his skin made him notice almost all its hair had vanished and it felt smooth, while the hair on his head had lengthened partway down his back. His face looked like another person all of a sudden, his jawline had turned softer, his neck had narrowed and his larynx shrunken, his cheeks had softened and his lips puffed out. He looked downwards to see his figure had shifted from masculine to feminine, as his wide shoulders, firm straight figure and narrow hips had reshaped into narrow shoulders, a soft curvy figure and wide hips.
By now all but the most intrinsic parts of his body had changed gender, and as his eyes were drawn to them the transformation seemed to enrapture his mind. It rationalised the instinct of his birth sex and made him realize: he did not have to be male. And as he slowly accepted that, he became fully she. His nipples perked up, the development his manhood had prevented coming to fruition as supple teats formed, and heavy breathing accompanied her soft sensitive breasts forming. Once they had formed, his penis slowly began to shrink away, only growing more sensitive as its nerve endings bound up tighter and tighter. His balls moved up inside the body and rapidly converted into ovaries, and his scrotum receded into a more subtle mound, the centre of which split open into a vagina.
She felt a deep sense of emasculation and castration as her male parts were turned female, but to her surprise it felt pleasant. Her body felt so different, and more sensitive to pleasure, like this. He'd expected it to feel gross and weird to be her, and instead it felt... nice. Especially with all these unfamiliar hormones racing around inside her. Female instinctive fantasies were filling her head- having her breasts cupped and played with, her nipples rubbed and pinched and sucked, her pussy licked and eaten and fucked. Her feminized nipples and tiny clitoris turned erect, and she felt her female juices leak as she thought of those things, and she wondered whether to just explore herself right here.