To Gelvin's horror, later that day she saw the leader mounting Nightingale, as the other mares had followed her and joined the wild herd as well. Nightingale's sweet voice as she was mated with made the leader so excited he mated with her again. Gelvin fumed. She had to do something, or the leader would lose interest in her in favor of Nightingale. The only consolation she had to being dominated was knowing that her mate was the leader of the herd, thus placing her and her foals in a high position as well.
Gelvin knew what to do to ensure the leader's loyalty to her. Nightingale was also being mounted by the largest stallion in the herd, an enormous buckskin Witch's Pony. If Gelvin became pregnant with the leader's foal, the leader would stay by her side, allowing Nightingale to be impregnated by the buckskin after she birthed her own offspring, emptying her womb. Once Nightingale carried a different stallion's foal, the leader would lose all interest in her.
Two days after joining the herd, when they stopped for the night, Gelvin waited until all the other members of the herd were asleep. Then she cast a pregnancy acceleration spell upon herself. Her stomach swelled as her foals grew within her. Then she felt her first contraction. Thankfully, giving birth as a horse was simple and painless. Her colt and filly slid out of her within minutes. Gelvin licked her foals clean and helped them stand. The foals happily nudged her belly for her udder, and upon finding it, suckled hungrily. Gelvin smiled to herself. Now all she had to do was wait.
Gelvin was woken in the morning by the sensation of a cock within her. She whinnied happily. The stallion's hooves were heavy on her back, his equine manhood enormous and throbbing. Her pussy clenched down hungrily, desperate for him to fill her with his seed, populate her newly empty womb. The stallion shot his seed into her, making her neigh in ecstasy. Over and over, he filled her with semen. When he finally pulled out of her, she could feel it dripping down her legs. And, thanks to a quick fertility spell, knew she was pregnant with the stallion's foal.
The stallion came around to nuzzle Gelvin. As he did so, she discovered the stallion that had impregnated her was...