"Well, you're progressing nicely, I'd say its probably only a few days until you go full Zebra," the doctor said as she finished checking Vicky over. She understood that there were a lot of infected like Vicky who wanted to leave their humanity behind for one reason or another. Despite being in stage 3 herself, she wasn't as ready to go full horse, even if she was tempted at times. "How are you feeling? Are you having any problems with your estrus?"
"Pretty good, and no," she said and blushed a little. "I found someone that was willing to help with that."
"Excellent, excellent," the doctor said with a smile as she took out a case that held a syringe. She had heard about what happened to that poor girl when she was exposed to it, but she could see the value in a drug like this that accelerated the changes for people like Vicky. She smiled and turned back to the Zebra woman who was eyeing it curiously.
"What is that?" Vicky asked curiously.
"Well, this was developed kind of by accident, it will accelerate your changes considerably," the Doctor said with a nod. "It might make it harder to acclimate to the new form, but it shouldn't cause any other problems. Its up to you though, do you want to become a full Zebra now?"
"Yes!" Vicky said with no hesitation.
The Doctor smiled and took her arm and injected her with the drug before she stepped back as the transformation began. Vicky got to her hooves and her body began to change rapidly, her chest barreled out as her teats formed and her butt fully pushed out. Her bone structure changed as she fell forward onto her hands as they shrunk and hardened into hooves as her neck finally formed.
She brayed excitedly as she looked at her new body in the mirror. There was nothing left of her human self, just a Zebra mare that stood there.
"Come on, lets get you out of here," the doctor said and lead the new Zebra out of the room.