"Greg" The old man's voice rangs out through the room. "I want you to step into the sealed room. You will be released as long as you obey my instructions.
The teenage Greg stepped foreward and entered the clear testing room. "What could be going on?" He wondered.
"Now Greg my boy, I'm looking over your profile and it seems like you are a relative loner. You have very few friends and don't get out much."
"I think you need to get a little more pleasure from your life, you need a little more...drive..."
Gas started to flood the room. Greg panicked as he searched for the door.
"You said you would release me!" He shouted.
"Oh, and I will. I'll release your inner beast. And don't worry about being lonely. I'm sure you'll have people all over you soon."
As the brown gass started to flood into the room, Greg couldn't help but inhale some of the fumes. He began to feel a tingling sensation as pink fur began to grow out of his skin.
"Don't worry, it will all be over soon. Besides, the mental changes are quite slow for this transformation, so you will be able to see what happens next." The man's voice rang into the chamber.
Greg groaned as his legs began to shift and grow. His face was changing vastly, his body was shifting completely into what was starting to look like a horse.
As the transformatations worked their way toward his head, his hips expanded, tail fully formed. His body was getting noticably curvey, and Greg began to whinney as he released something was missing. Soon, the change worked up into Greg's face.
As his face changed, it grew and molded into a typical horses. His eyes grew, still retaining the appearence of intellegence. His eyelashes long and feminine. His body was almost cartoony curvey and female.
As the gas cleared, all that was left of the once teenage boy, was a blazingly hot pink mare. Her tail flickered as she began to trot around the room seductively.
Greg was is a full state of panick.
"What have I become...a horse, a a female at that!?!?"
"I have to find a way out of here!" her thoughts raced through her head.
"Speaking of drive," The old man said "Your sex drive is about 5x that of a normal mare...so have fun!"
"Please help me!" she yelled, but only the sound of a panicked horse was heard. "Oh no....I can't let this happen" she thought.
"I need to find a way out....or a guy...howabout a stud?" She smiled at the thought, her hips swaying as she moved.
The old man observed the outcome of the transformation, smilling at the beautiful white mare trotting around her enclosure.
"I am sorry, I know this must be hard on you Greg. But you won't have to worry about dealing with this panick anylonger. In a few days your human mind will be replaced by that of typical mare. You will begin to enjoy yourself....because not only are you now a horse, but you will be responsible with starting up a new population...something that you, now being a brood mare, will deeply enjoy. And I need to stop calling you Greg...no...I think Sarah would fit your new features better.
"Also, I have a little gift for you, Sarah....something to take your mind off your troubles."
As the man said this, the door of the chamber opened as a large Stud walked into the room.
"This is Mark....he is rather pleased to meet you....as you are a rather sexy mare if I might say so Sarah."
Mark had begon to brush against Sarah, who was having trouble fighting off thoughts of being a naughty girl.
"Oh no...I...need to get out...I can't have sex...with a male...I am a male....oh...he is big....and strong...and he smells very nice..." Greg's, now Sarah's thoughts became more and more like that of a bimbo mare.
"Oh...I need him so bad...I need him...." Sarah thought as Mark began to mount her. She strutted out her but as Mark began to enter her.
"OHHHHHHHHH..." As massive amounts of pleasure began to wipe away Sarah's previous thoughts. She let out a whinney of delight as the mating continued. "I neeeeed more....Please don't stop!"
"No Greg...omg wtf are you doing! You are a man, you can't enjoy this....." was all that Sarah heard before her eyes simply glazed over with heated lust.
"Wow...I guess it might only be a few more hours until Sarah's mind is that of a sex-starved bimbo mare...this is working much better than expected" The old man said.
Now that those two are takene care of, who will be next?