The mare ushered Emily over to you. "Slave girl, you are honored, for you shall be the first of his victims." Emily looked stunned, "...but you said that... I brought him to you...I-I..." The mare turned its gaze to her, glaring, and she dropped to the floor with a yelp, obviously in pain. "Imputent girl! You are my slave, and you shall do as you are told." Emily stumbled back to her feet, and with a look of bewilderment and fear, she approached you.
"There, there, girl. Don't be shy, step between his legs. I'd promise that he won't bite, but well..." The mare let out a half neigh-half laugh. Emily stepped up close enough to you that her waist was between your knees. The horse nudged her in the back, "Go on, you know what to do." Emily gripped your cock with both of her hands and stared at it for a moment. Then, reluctantly, she lowered her mouth toward its base. Just as she went to open her mouth, just as she was about to slide your member into the soft embrace of her throat, the tip of your cock lurched open entirely of its own free will and lunged forward, engulfing her head with amazing elasticity.
You stared on in disbelief, "What the fuck!?!?" Emily began to flail her arms, blindly trying to grip the base of your cock below the bulge that was her head, but she fumbled for too long. Your cock tensed, and with what could only be described as a gulping motion, it swallowed Emily up past her shoulders, pulling her up onto her tippy-toes.
The mare watched on in satisfaction, "yes..it's working wonderfully..." Your eyes widened in partial amazement and terror as your cock made another gulping motion, pulling Emily in down to her waist, and fully lifting her up off of the ground, hanging her now barely twitching legs out of the end of your cock.
You glanced at the mare, now standing off to the side, and for a moment, you could have sworn that a tear fell from her eye. "The birth of a beautiful abomination, a creation in abstractness the gods themselves would admire. You, boy, are the sole possessor of a gift so powerful that those species who obtained it had to be hunted to extinction. I was given a blessing from my father, Thaltos, God of the Horses, so that I may begin the cycle again. The Reign of the Vorphallus has begun again. It will not be long now, I must go. I do wish that I could stay to witness this most magnificent process, but I would place myself in danger. Tomorrow, when you have rested, travel east around the island's shore, using the Sun to guide you. After about a mile, you will find a crested plateau extending into the sea. There, I will wait for you, along with the answers you will inevitably pursue." The mare turned to leave and paused for a moment. "My name...is Peleirose, and as of this moment, I no longer consider you my slave." With that she sped away across the shining sand, her mane flaring behind her as her muscular body propelled out of your line of sight.
Perplexed, you looked back to the situation brewing between your legs. You thought to yourself, 'A gift...I...I can control it? Then....maybe I could...Emily! I must save Emily! I don't care what came over her, I love her!' And with that conclusive decision set in your mind, you, with the last of your energy, gave an effort of gargantuan proportions...