Jasper couldn't stop the stallion from shoving his enormous cock into her pussy. She whinnied furiously as the stallion thrust vigorously into her, grunting and neighing loudly. The stallion was insatiable, mating with Jasper for what felt like hours. All the while, Jasper stomped her hooves and tried to buck him off. But he had a firm grip on her, and her attempts to get him off only brought him deeper within her.
Finally, the stallion came with a deafening whinny, shooting a massive load into Jasper. He dismounted. Jasper's fury over what had just happened overrode her animal instincts, and instead of following him off into the woods, she neighed angrily and galloped back to the corral.
She had just slowed to a trot when she felt a rein and bridle, along with a saddle, magically appear on her. She stopped, confused. A hand gripped her reins.
"There you are, Jasper," Anya's voice said. Jasper looked over. She whinnied happily. "I am sorry you were turned to a mare instead of merely a different human form. But the transformation was always going to be random." Anya stroked Jasper sweetly. "I think it best if you stay in this form until we arrive at my hometown, where it is safe." Jasper nodded reluctantly. "In the meantime, I will call you Sassy. Jasper is not an appropriate name for a mare."
Jasper, now Sassy, stood still as Anya mounted her. Anya gently dug her heels into Sassy's sides and clicked her tongue. Sassy set off. Hopefully, they wouldn't run into anyone until they got to the next town to rest for the night.