Vicky went to Jessica first and fitted a bridle on the mare's snout. Jessica struggled for a moment, but she turned passive and allowed it to slip over her. Vicky smiled as she patted Jessica on the snout for a moment. "Good girl, we'll make a good broodmare out of you yet."
Jessica lowered her head a little as Vicky turned her attention towards you. She moved forward and placed her hands on your muzzle with a smile and then took out another bridle. She was about to slip it over your muzzle when, more on instinct than anything else, you lashed out and bit her hard on the arm. She cried out and grabbed the bite spot, glaring at you.
"You bastard, why did you do that?" She shouted as she raised her hand to strike you. "I'm going to..."
"Vicky, stop," one of the other attendants said, catching her arm. "We need to get you back to the Stables in time to administer the antidote."
"Right," Vicky said, ripping cloth off her shirt and wrapping them around her arm wound. "We'll need to move fast, this close to a transformation lock and it'll be ficker..."
What she was trying to say turned into a nicker. She covered her mouth as you and Jessica exchanged a look as you saw fur starting to grow on the attendant's arm. She looked scared as they all started to walk together towards the stables. You and Jessica hadn't realized how far you had traveled the day before as her transformation continued.
"This is neighing too long..." Vicky said with a groan as she felt her fingers turning stiff. She was already having a hard time staying on two feet as her body fur was growing faster. She was slowly starting to lose her ability to talk. Her clothes were straining against her growing body as you could smell her body becoming more horse-like. The scent was driving you wild as you watched her pants tear, revealing her bare ass which was now taking on a more equine shape with a tail growing out of it.
"Well, she's coming along nicely, isn't she?" One of the attendants whispered in your ear. "She's a vile woman, she'd make a better broodmare than she ever would an attendant. We're going to make sure she doesn't get back to the stable in time, you just need to do your part."
You couldn't resist it, the smell of Vicky's heat hit your nose as your shaft slid out of its sheathe. She now had her tail raised and had fallen onto all fours, her hands and feet having fused together as they became hooves. This was your chance.