As soon as the sentence is finished, you notice that your girlfriend begins to change shape: as she grows taller, outperforming you, her muscle mass increases.
On her now decidedly muscular legs, a light hair appears at first, which gradually intensifies. The same transformation takes place on her arms, now bigger than yours and hairier of course. Her breasts gradually withdraw into the expanding chest, which is covered in thick dark, curly hair. A large swelling appears in the pubic area, a sign of the gender transition. Finally, while the feminine features are still recognizable, they still become more pronounced, with thicker and unregulated eyebrows, a prominent jaw and a larger nose.
A thick bristly hair appears on her face, rapidly evolving into a beard of a couple of days, while a healthy mustache grows on her upper lip. The only thing that remains unchanged are her pouty lips, her puppy green eyes and her brown hair, which she kept gathered in a ponytail.
Then your GF spoke again, this time in a deep masculine voice, to say: