...your body stiffens.
It starts in your hands. They suddenly tighten up. You slow down and hold them up to see them turning white, white like the hands of statues. Your feet feel stiff as well, and you find it harder and harder to even walk as your legs grow stiffer as well.
"No!" you scream in a decidedly female voice. "Help me! Somebody help me."
The stiffness spreads leaving your legs and arms solid and numb and heavy, like stone. By that point, you can barely move you look down to see a line of cleavage below turn white, and then it spreads up your neck, cutting off your air and leaving you stuck staring at your sizable female breasts as your head is overtaken by the stone wrapping around it to you eyes last. In that last moment of natural sight, you think, well at least I have a nice view as I go.
***
In the window of the mansion, the witch appraises her new artwork. Staring at the former man's shapely ass and the shapely side boob visible from her vantage, she feels satisfied. It was a slapdash affair, true, but at least it worked out well. Her new neighbor had made for a nice addition to her garden.
"Well, back to my other work," she says as she shuts the window and disappears into the mansion.