"The flute." Carrie decided on. Suddenly her body became flushed. Her friends momentarily stopped their self-pleasure to watch their friend transforming.
Carrie's legs grew longer, and long brown hairs started to appear. Her thighs were very round, while her calves started to appear very skinny. Her feet balled up, and the nails became black. They spread over the flesh until Carrie's feet became enveloped in the keratin. She had shiny hooves, fetlocks, the whole nine yards. She was turning into a satyr.
She tried to stand, but found she couldn't keep her balance like before. Carrie watched as more and more fur spread across her body. There was a distinct happy trail from her crotch to her naval. Her forearms grew wispy hairs, and her hands started to change. Carrie's fingers melded until she was left with two thick digits, and one enlarged thumb. The nails did the same thing they did on her feet, spreading until she was left with hoof-hands.
Two blunt horns grew from her forehead, and her face pushed forward to a slight muzzle. Carrie's ears tugged to the sides, becoming long and covered in fur. But her most unexpected transformation came when her groin started to quiver. Carrie's clit shot out from her body, and then became trapped inside a furry sheath. Two long testicles dropped into an equally furry sack.
But that's what was unexpected. Carrie found she still had her vagina, though it was now covered in hair and much larger. Not like Jill's horse pussy, but it wasn't too far off. Her breasts gained mass, doubling in size to DD cups. And around her naval, two new goat udders appeared. They were only C cup, but the nipples were long and black, just like the ones on her original breasts were slowly becoming. Milk dribbled out and ran down Carrie's torso.
When the transformation had finished, a new herm-satyr was standing before the other three girls. Who each felt more aroused than ever in Carrie's presence. Because, after all, satyrs are known for being creatures of lust...