Fervent lust, as from the mind of a man turned to horse finds his being turned an animal as invigorating. A snort and the new beast did mount the black mare, as Red standing close by did help with a loving hand to guide the massive cock to its target.
Equine instincts fostered the rest of the mating actions, and after but five thrusts the sperm spewed forth. The mare and her vulva, her vaginal walls did her best, bettering for both stud and mare the heightened style of being mutually sensual.
"Oh dear," I heard Red exclaim, "If you could think as a man does, and knowing what you just did, you would know that Mother cursed you, and you sealed your fate. She has damned you through your want for feeling sex from a brutal style. Know this, you shall remain a horse, a draft animal, and a stallion worthy for use as a stud, starting now, and likely for the future of twenty years. Know too, that somewhere during your equine sensual life, what remains of your mentality will fade, and beastly ignorance will rule you through your sensual existence!"
As with my huge cock still embedded deep inside the lusty mare, the realization of what I did to my future caused me some worries.