A small tube, looking almost like a jelly-like test-tube, descends from the machine, and nestles itself right over the girl's clitoris. A small, little needle suddenly darts out, causing a sharp squeal of pain from the restrained female. The tubes begin to fill up with a thick, white goo; something akin to animal cum, and it ends up slowly being pumped right into all of those orifices.
She gags, trying to fight off the pungent taste of animal semen, but can't stop the flow of that goo into her mouth. It flows into her belly, and up her colon; hell, it even begins to inflate her breasts, albeit at a slow rate. As her smallish breasts being to gain volume, and weight, her clitoris is undergoing a near-exact process. IT begins to elongate, and stretch; throbbing with her panicking heart rate. As for her labia, it starts to stretch, and distend, gaining volume and mass. The cum, mixed with a cocktail of forcibly-changing chemicals, is violently absorbed by the restrained woman.
As her belly distends from not only her womb, but her intestines filling up, the changes on her form become more, and more visible. Her ears begin to slowly lengthen, and the skin between her thighs takes on a nice, dark, almost black-rubbery hue. The poor girl is filled with the emotions of a bestial stallion, and she can't decide between letting go, or totally resisting...