From the moment you started dating Amy, you had fell in love at first sight. Not only was she beautiful, but she was the kindest person you ever met. Not to mention that adorable laugh she had.
Now....now she, or rather....he, was a stallion. If you ever wanted to see Amy as Amy again, you would...have to become a mare and let him....breed you. It was crazy, insane, and downright disgusting. But, despite that, despite what you felt about that process....if it brought your Amy back...
You sigh. "Fine. I'll...I'll do it. How does this work anyways?"
"Just put it on," the man explains. "The transformation should start immediately. After it's finished, I'll lead you to the stable."
"Alright...." you stare at the halter before sliding it on. "Here we go..."
Once the straps were on, suddenly you felt yourself forced onto all fours. You cried out in pain as your joints shifted themselves to a more quadrupedal stance. While it hurt like hell, that was the most painful part of the experience out of the way....comparatively.
Your hands and feet bunched up and hardened until they became 2 sets of hardened light gray hooves, as white fur began to grow all over your body. A body, which, was growing and lengthening, gaining a lot more pounds. Your neck grew taller, and you were able to see as you opened your eyes for a second, your mouth and nose melting together and pushing outwards into a white muzzle.
Speaking of your eyes, they too changed, moving more to the sides and the whites becoming less noticeable. Your ears moved as well, becoming more triangular as they moved to the top of your head. Simultaneously, your short black hair turned into a yellowish-white mane that fell down your neck, whilst a matching color tail flowed out from your new flanks.
Then....the part you were regretting most. You reactively neighed as your human male equipment was violently sucked into you, reforming into the many parts of a mare's reproductive organs, and leaving a slit in their place on the outside. Lastly, two mounds that were your new teats bulged out above the new hole.
The transformation was finished, and you stood there, exhausted. Staring back at you in a puddle was a white-coated mare. You could take a moment to catch your breath, or....