Sarah leads Rachel out to the far end of the back yard, near the flowerbed. "Are you comfy Rachel?"
The palomino paws at the grass in delight. "Oh yes, I feel so alive..." adding "... mistress." in a shy nicker.
Sarah saw the twinkle in her eyes and played along. Sie nickered happily and groomed her back, slowly leading to foreplay.
Soon, Sara rubbed hir huge black cock to Rachel's dark maresex, finally plunging in like a wild stallion. Sarah nipped and stroked like a dominant stud as sie pounded away, using the reins more and more to move Rachel back and forth with hir thrusts. Sarah neighed dirty talk in play, sounding more serious as they went on "Yes my prize, you are mine as you wished, be my little mare!" Rachel squealed in delight, rocking back even harder, "Yes my Mistress!"
Finally, they whinny their climax to the stars above.
As sie slid free, they snuggled up for a while. Finally, Sarah stood and started back to the party. "Shall we go back?"
Rachel got to her hooves, head lowered submissively "Yes Mistress."
Sarah blinked and looked back. the reins were lying on the ground, with Rachel looking expectantly at her as if trained to ground-tying in that manner. "Mistress lead me?"
Sarah automatically reached for the reins, wondering why sie did, but more in power each second sie had them. "Rachel, come!"
She followed Sarah, beat for beat, back to the party. Sarah finally came to hirself when sie announced Rachel was her new mare, her posession, and anyone was free to try her out.
Rachel nickered in pleasure as several partygoers gathered around her; one mounting her back to ride, while others groped and stroked her.
Sarah shivered as the feeling of power faded a little. Should sie remove the halter? Was it too late or something?
Sie had to find Joey!