Dr Jenkins started to tremble in fear as the stallion slowly walked towards him. However, he couldn’t deny that the warm feeling inside him that had grown stronger as his transformation had progressed. Something about the horse's heavy musky smell was strangely intoxicating.
Meanwhile Mark approached the transforming doctor, not wanting to incur any punishment by upsetting his new owner. Having understood Mrs King’s wishes, he dutifully reached under Jenkins’ rounded belly and pressed his muzzle between the doctor’s enormous thighs.
Jenkins was stunned by this intrusive behaviour, but then his eyes shot open when he felt the horse’s wet tongue touch his limp cock and balls. He tried to back away but Mrs King held him in place, making sure that he couldn’t escape his fate.
As Jenkins fought against the attendant, Mark continued to perform his duty as he licked over the doctor’s manhood again and again. To his utter shame, Jenkins soon felt his dick hardening as the stallion’s presence continued to cloud his mind.
After about a minute Jenkins suddenly shuddered as he abruptly climaxed, sending multiple jets of cum shooting onto the floor below. However, the discharge soon turned into more of a stream, almost as if he were pissing. The odd sensations made him feel queasy as his testicles steadily deflated until they were just empty husks of wrinkly skin.
Following this, Jenkins then felt even weirder as his shrunken genitals pulled back between his legs. Mark removed his head from under him and moved around to look at the doctor’s rear. He then pressed forward again, licking the doctor’s shrivelled manhood as it continued to pull up under his tail.
Jenkins remained stunned and trembling uneasily as the strange feelings continued to resonate from between his legs. However, things only got worse when he felt the saggy skin of his scrotum stretch and reshape to form a new mound under his tail. The puffy flesh then split down the middle as a new orifice opened up. The skin around the slit continued to bulge and grow, while his limp dick began to retreat inside. He grimaced as it morphed into a small hyper-sensitive nub that now sat inside a warm wet channel.
Jenkins didn’t have to see it to know what had happened: he now had a mare pussy!
Mrs King smiled as the shock and humiliation appeared on the doctor’s face. “Yes doctor, soon you’ll be a beautiful broodmare; a simple animal to be ridden and bred.”
Jenkins bristled at this, but was too distracted by the sensations coming from his new sex organ. As it happened, Mark had never stopped his licking, meaning that he now had his tongue buried inside the doctor’s freshly-minted vagina.
Jenkins wanted to deny the pleasure, but he, or rather SHE, couldn’t hold back a lustful whinny when Mark’s tongue rubbed her clit for the first time.
“Quite a horny little thing aren’t we? The studs are going to treasure your cunt dearly.” Mrs King smiled as she watched the doctor starting to lose all control. “Hmm… I think such a dirty mare deserves an appropriate name. I think ‘Jen’ will do nicely.”
‘Jen’ heard the woman’s words, but didn’t respond as Mark continued to sample her hot, slick pussy.
“Alright Mark,” King continued, “I think it’s time to make a true broodmare out of Jen here.” She gave a slight pause for dramatic effect. “Go ahead and fuck her!”
Jen neighed sadly as Mark’s tongue pulled back out of her tight snatch. She turned to see that he had stepped back, and was now seemingly sizing her up.
Not wishing to disappoint him, Jen turned her large round ass towards him. She then lifted her tail to reveal her black teardrop vagina as it sat there with the lips looking large and swollen. She then instinctively began winking her new organ, flashing her clit as her vulva opened and closed invitingly. As this happened Jen naturally released a cloud of enticing pheromones that steadily wafted around the room. All of these signals told the stallion that she was ready for him. And predictably, he didn’t hesitate to accept her invitation.
With a grunt, Mark mounted Jen’s firm ass and instantly started searching for her slick tunnel as he poked around with his stiff, fully-erect cock.
Jen’s heartbeat raced with excitement as she felt the stallion’s large meaty cock jabbing between her legs. She couldn’t wait to see what that heavenly penis would feel like ramming into her tight virgin snatch. She let slip a short impatient whinny, begging Mark to hurry up and claim her.
Now feeling the pressure, Mark began stabbing forward faster and more urgently. He missed a dozen more times before, to the relief of both horses, he felt the tip of his penis parting Jen’s slick vaginal walls for the first time.
Jen whinnied out in ecstasy as her tight walls were parted by Mark’s mushroom-shaped tip. She shuddered as she felt it pressing deep inside her, followed by the girth of her mate’s shaft as her inner walls clamped down around him. Having steadily walked himself forward, Mark now loomed over Jen, his cock now buried deep inside her.
Not wanting to disappoint his new mate, Mark began slowly working his hips, allowing his dick to move in and out in long forceful strokes. This made Jen whinny in delight as his rigid length rubbed against her sensitive inner walls, spreading her wide open. The sparks of pleasure were particularly concentrated around Jen’s clit, as it too enjoyed being rubbed and stretched by her mate’s enormous member.
Mrs King smiled sadistically as the couple steadily increased their tempo. Both horses were soon whinnying wildly as they fucked passionately in front of her. And as the volume got louder and Mark’s pounding became more furious, she knew it wouldn’t be long before the pair were irreversibly locked into their new forms.
Mrs King was proved correct as the mating reached a fever pitch. Mark was relentlessly pounding his mate’s needy hole, not holding back at all as he rammed his dick inside her again and again. Meanwhile, Jen was fully spaced out of her surroundings as she rocked in time with her mate’s thrusts. Feeling his cock stretching her and ramming into her deepest recesses was indescribably wonderful.
Soon Jen could take it no more. She cried out and threw her head back as her vagina quivered. She then came hard; coating her mate’s penis in warm mare juices.
Feeling this then triggered something in Mark’s mind. He rammed his dick forward as far as it would go, such that his sheath rested against her entrance and his flaring tip pressed against her cervix. Then, with an almighty bellow he too came; flooding his mate with a torrent of viscous stallion cum.
Mrs King giggled to herself as she saw Mark’s balls tense up and Jen shudder in delight. She bent down to look beneath the couple, just in time to see a spurt of cum and pussy juice spraying out of Jen’s parted vaginal lips. This was followed by a steady stream of fluids that seeped out of Jen’s stuffed channel and ended up running down her legs.
Mark rested on top of Jen for a few moments as he finished shooting his load inside her. Then, once the last few dribbles of cum had dripped into her overflowing passage, he finally withdrew. He landed back on all fours with a thud as his dick finally started to soften. Meanwhile, Jen remained motionless, clearly still basking in the bliss of her first female orgasm.
Mrs King smiled as she walked over to Mark. “Excellent work stud! If you approach all of your duties with such enthusiasm you will be well-rewarded!”
“And as for you,” she said as she looked at Jen, “you can look forward to having your first foal. You’d better get used to it because that will be your main purpose in life from now on!”
Jen just snorted dumbly, barely even registering the women’s harsh words.
And with that, Mrs King led her two new horses back out into the main barn of the Stables. Before long Mark was being taken for his first ride by an unfortunate guest, while Jen was busy eating and reflecting on her transformation and mating.
Jen still remembered her old life, but her mind had been completely mixed up by her transformation. She recalled trying to escape the Zoo and get back to her human family, but she was struggling to understand why that mattered any more. Now that she was a horse, and a horny broodmare at that, why should she care about her old human problems? After all, she had a comfy stall, plenty of herd-mates and a wonderful juicy cunt between her legs. What more could she possibly want?
Before long, Jen had reached the logical conclusion that she might as well enjoy her new lifestyle, given that it had been made permanent. And so Jen whinnied happily and swished her tail as she was taken outside and placed in a field with the other broodmares. Before long she was acting naturally; socialising with the other horses, chewing the lush grass beneath her and dreaming about being fucked by stallions and having their foals.
Mrs King chuckled to herself as she watched her new mare grazing in the field. Already she was drawing up a list of studs for Jen to ‘work with.’ She was determined to turn Jen into a star breeder, figuring that this was the most appropriate way that the former doctor could repay the Zoo for her treachery.
Mrs King then looked up when she heard a loud snort nearby. She turned to see Prince looking at her with an eager glint in his eyes. Mrs King smiled as she stroked her colleague-turned-stallion’s nose. Now she knew exactly who Jen’s next partner would be...