Your mind reeled, your human side had lost out. Though deep down you knew that it didn't matter, with Vicky here this was going to end with you a horse either way. at least this way you would stay as your birth gender. As you nodded your head slightly, Vicky smiled and leaned in close to your ear.
"I thought so, Prince," she said with a smile. She nodded to Jessica who had apparently given up too. She had lifted her tail and looked back at you expectantly, her folds winking at you as she gave you a nod. "Look at her, she wants that big stallion cock in her. If not yours, it'll be some other stud's, so take her... make her all yours."
You required no further prompting as you moved forward, you could feel your erection throbbing in anticipation of mounting your girlfriend... no your mare. She would never be anything more than that to you again. Your first mare, but you knew that she was going to be far from the last one to bear your foals.
You reared up on your hind legs and brought yourself down on Jessica's back. She let out a whinny as you did a few testing thrusts, the flared tip of your cock rubbing against her flanks because of your lack of experience with this body. Finally after a few thrusts you found yourself pressed against her entrance. Finally you thrusted forward into Jessica, she let out a whinny of surprise as you thrust around half of your cock deep into her.
Your mind was now consumed by animalistic pleasure, the Horse part of you had now completely overwhelmed your human side, and even the human side was enjoying it. You started to thrust in and out of Jessica, your shaft stretching her vagina as you did. It felt so good, no worries, no troubles, just pure animalistic lust. You hilted her as your massive balls slapped against her as she whinnied in pleasure, the two of you completely lost in your newfound pleasure.
Meanwhile you were only vaguely aware of the fact that you were being watched closely by Vicky and the other attendants. They were examining the mating horses with great interest. Vicky in particular grinned, this new stud was far more eager than she had expected, there would be other broodmares, but a good stud would be worth even more. Especially if he was as eager to breed in the future as he was now.
You let out a neigh as you hilted the mare beneath you once more and bit lightly on her neck, claiming her as your own. She was now yours and she would always be yours. You no longer cared about the human she once was, or the one you were. As far as you were concerned now, this was your life from now on as your human mind slipped away completely. You thrust into her one last time and your balls churned as you threw your head back, ropes of your cum spurted into her womb as she clamped down on you, drawing out as much of your cum as she could.
The attendants cheered as you pulled out of Jessica and fell onto your forelegs again and began to graze. You had resigned yourself to your new life, now you were Prince, the stallion stud. This was your fate, and you no longer cared. All you could think about was all the mares you'd be breeding, and all the women you'd be transforming.
The human you once were was gone forever.