As they neared the Eastern Hills, the region in which Wind's Grove was located, Gelvin's small herd crossed paths with a much bigger herd. A wild herd. The members of the wild herd seemed interested in them, which made sense. All eight now smelled of pregnancy, indicating they were fertile. Wild herds also liked to collect Witch's Ponies, as they improved the herd's breeding stock. Gelvin had seen multiple Witch's Ponies join wild herds, only to take over quickly due to their superior intelligence and high pedigree.
Surely Gelvin could do the same, right? If a regular, dumb horse could take charge, surely she, truly a human, could do so as well. It would be better to travel with a larger herd for safety, after all. They'd had a number of close calls getting to the Eastern Hills. And if she could bring the Copperstones multiple wild horses to join their breeding program (as she spotted a couple nice-looking Witch's Ponies in the herd), it might soften the blow of everything she had done.
Unfortunately for Gelvin, the moment she approached the wild herd's leader, a massive blue roan stallion, the wild horse took over. He went around her back to sniff her, which she expected and tolerated to improve her chances of taking charge of the situation. Just as she realized he had stopped sniffing her but was still behind her, she felt his hooves on her back. Panicking, Gelvin tried to get the stallion off, but he was too large and heavy. He thrust his massive cock into her pussy on his first try. Gelvin whinnied in ecstasy as she experienced sex as a mare for the first time. No wonder the other mares had followed her after she did this to them!
The stallion pounded away at her, while Gelvin's vaginal muscles clenched hungrily upon him, starving for sex. A load of semen was shot into her. Then another. And another. Gelvin's eyes rolled to the back of her head with pleasure. After what felt like hours, the stallion dismounted. He nuzzled Gelvin. Gelvin nuzzled him back. He had not only dominated her, he had claimed her as his mate. Once she gave birth, he would put another foal or two in her immediately.
And she was looking forward to it.