Forced to Birth the Centaur's Foal

I’m Dylena, human slave girl of the centaur king. He treats me well, until I become a woman. Now, he wants my untouched body for himself. As his property, I have no say in the matter. Only, he wants more from me than just sex. He also wants me to do the unthinkable and bear his first foal.
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He locks me in his room so he can have his way with me and impregnate me. My belly grows fast, and soon, I’m fully pregnant and ready to give birth. When the contractions start, I have no idea what to expect with this inhuman delivery. Will I be able to handle birthing his foal? And will he make me a simple slave again when he is through or will he keep me as his breeding captive forever?

Warning: This book is a rapid pregnancy, monster erotica short story.