You notice a half human half goat kid leaning against a tree. He looks at you and shakes his head.
"What haven't you seen two centaurs make love before?"
"Oh, I have and that's why I'm shaking my head, sir or should I say madam?" he answered with a sigh, "Obviously, you haven't or you'd know that wasn't a real male centaur. Just a magical glamour concealing the real creature that mounted you."
"What? I saw him? I felt him!" you shout.
"Ah, you felt the male portion of an equine mount you that's for sure, but did you feel hands or did you just think you felt hands? Sad day for you indeed, but sadder and more painful will be the birth of the creature it set in your womb."
"What!" you shout in anger and fear.
"Ah, well, you used to be a male human, so you probably saw the movie Alien," the faun said slowly.
"Yes. So?"
"Well, remember the scene with alien bursting out of the man's chest? Well, not imagine it with a foot long twisted ivory horn on its head and great brass-like hooves. The mockingbird like monster just deposited an unicorn embryo in your uterus. The reason there are so few unicorns is that each newborn colt performs its own c-section leaving its mother to die unless a male unicorn transfers it from its mother to an adequate host. A normal horse won't do. So it's a centaur or minotaur, and they get scarcer every year too."
"Well, maybe I can lose it?" you say nervously.
"Uh, I'd look at your swollen belly. I don't think you've got that much time," the goat boy points out forlornly.
You bend now to examine your swollen body, and you notice that your teats are swollen too and already lactating.