As he lies in bed, Dean starts to imagine himself as a big, strong and handsome black stallion, for a moment he seems to forget that the black mare in the stables is his best friend Jeff. The boy grins when he feels his cock twitch and start to erect, as images of him as a stallion mounting that beautiful black mare, 'mrrrr...,' he thinks to himself, 'I bet it would feel amazing! I got to ask Jeff if he'd be okay with me being the Stallion. I think he will be, I am sure he'd prefer the Stallion breeding “her” to be someone “she” knows rather than some stranger,' with that thought in mind, the teen falls asleep, dreaming dreams of him as a black Arabian Stallion mounting a black Arabian Mare.
Dean gets up early the next morning, “today is the day,” he says, jumping out of bed and getting dressed, “Je... I mean “Sahara” will be going into heat. I gotta get to the stables and explain her my plan, I hope she agrees... if she doesn't, well... I'll do it anyway!”
When Dean arrives at the stables, he hears frustrated whineys come from the box where “Sahara” is in, 'I guess she is already in heat,' he thinks to himself, 'better go check on her.' Dean walks up to the box, he sees the “mare” restlessly pacing back and fourth, shaking her head, nickering and whining. “Good morning, Sahara,” Dean says, this causes the big horse to jump, startled by Dean's sudden appearance.
When Jeff realizes who it is, she lets out a snort and gives Dean a look which resembles a scowl.
“Sorry, girl,” Dean says, “didn't mean to startle you.”
Jeff lets out a snort and stomps her front hoof, 'I am NOT a GIRL! I want to be myself again!'
Dean senses what Jeff/Sahara is “saying”, he lets out a sigh, “sorry,” he says, “I told you, just endure this breeding and you'll be to your old boring human self tomorrow.” Jeff lets out a huff, “listen, I had an idea,” Dean says, Jeff's ears perk up, “I assume you don't want to be bred by a real stallion, even though you can not become pregnant, right?”
Jeff nods her head, 'damn right,' he “says”, 'I don't want to be bred AT ALL,' and stomps her hoof once again.
Dean looks at his former friend, now mare, “just listen to me, you might find my idea interesting,” he says, Jeff tilts her head, “what would you think if the Stallion, who'd mount you, were me?”
Jeff's/Sahara's eyes widen, she backs away and shakes her head, snorting and whining.
Dean sighs, “I guess that is a “no”,” he says, “well... think about it. You only have these two options, either you let “Thunder” mount you or me.” Dean opens the door to the box, “come, I'll take you to the pasture,” he says, “you can have some time to think about this and I'll return in an hour, sounds fair?”
Jeff thinks for a while, she then nods her head, 'I guess.'
So Dean puts a rope around Sahara's neck and leads her out the stables and down to the pasture, Dean slips the rope from the mare's neck and looks up at her, “go on,” he says, “do a few laps, eat some gras and just take your time to think about it, I'll be back in an hour,” with that, Dean closes the gate to the pasture and walks off.
Jeff watches his friend walk off, she shakes her head, 'what else do I have to endure? Being a freaking female is worse enough!'
Meanwhile, Dean walks a few feet, until he is out of Sahara's sight, makes a wide turn and walks back to the pasture. The pasture is pretty large, almost 40 acres, and he was on the other end of the fence, which means Jeff/Sahara will be unable to see him. Being this far from any building and road, Dean does not need to worry about being seen. He takes out his phone and dials the number of "Thunder's" owner, he explaines that he decided against breeding "Sahara" with "Thunder", that his parents had already found the "perfect" Stallion to breed "Sahara", and that Dean himself was not aware of this. The Owner of "Thunder" sounded disapointed but seemed to not be mad at Dean.
After the conversation with "Thunder's" owner, the teenager climbs over the wooden fence and jumps into the pasture, he then strips out of his clothes and hangs them over the fence. Dean shivers from the cold air, “be-better... g-get... this d-done qui-qui-quickly,” he says through chattering teeth. He takes out his phone, opens the App, scans himself then opens his file. He then opens the “Animal Package” and chooses “Equine”, he scrolls down until he finds the “Arabian Horse”, he clicks on it and chooses “Stallion”. Dean then chooses his fur to be pitch black, and the transformation to last for four hours, that should be enough to fuck the “Mare” a few times and head back here before the time runs out. Lastly, Dean sets the transformation to be pleasurable, not wanting to suffer from pain, the boy then hits confirm and simply waits.
After he put his phone back into his jeans, Dean feels his whole body start to tingle, “man, Jeff was right,” he says, “it is a weird feeling, almost as if my whole body has fallen asleep.”
Dean suddenly feels his body starting to become warm, he looks down and grins when he notices his black shiny fur coat start to grow out of his body, a tugging on his tailbone signals him the growing of his tail, Dean's muscles pop as they grow in size, his neck lengthens while his face pushes out into a muzzle. He feels his body growing, he feels his toe and fingers harden as they become black hooves. Dean falls forward and lands on his front legs with a grunt, his cock head grows longer and thicker as his foreskin becomes his sheath. Dean's body is shaking in ecstasy from the pleasure of the transformation, the now black stallion suddenly lets out a loud whiny as he sprays all of his human seed over the grass. Dean's balls then refill with horse sperm, the new stallion takes a few minutes to collect himself, then he takes a few careful steps, which soon turns into a trot and finally into a full on gallop as he runs towards the other end of the pasture, where a certain “mare” is “waiting” for him.