Jen barely made it another block before she knew she was in trouble. Just around the next corner was the mailman, and Jen knew as soon as she lay eyes on him that if she got any closer that she would end up fucking him just like she did with the dog. She dove down a private lane and ran for a mile before stopping to think again. She looked around herself. All she could see was farm fields, mercifully void of any livestock. She remembered that the school's sports fields backed on to this farm, so she clambered over the fence and started heading in the direction that she thought was right.
Jen got through two fields and once again found herself in trouble. The third field was occupied by a horse, currently on the opposite side from where Jen stood, trotting around the perimeter. Jen considered turning back, but she knew that she was bound to bump into - and fuck - people on the public roads. She considered other options. From this distance she knew she wasn't tempted to fuck the horse because she wasn't transforming into an anthro-horse. With the horse circling the field, she surmised that it might be possible to circle the field opposite the beast and besides, if the plan went wrong, fucking the dog hadn't been so bad. No! She couldn't allow herself to start thinking like that. But the plan was good, so Jen took a deep breath and took the risk.
The plan worked at first. The horse ignored her and Jen didn't show any signs of changing, then the horse, evidently bored with just trotting, slowly started picking up speed. It was too late to turn back so Jen started running for the other side of the field. The horse noticed Jen as it reached a full gallop and veered towards her. Jen ran as fast as she could but she knew that it was hopeless as her clothes started to rip from her changing body. She looked over her shoulder to see how close the horse was and found her eyes drawn to his throbbing erect cock. A rabbit hole caught Jen's foot and brought her crashing to the ground. The horse, now running on only two legs, was on top of her in a heartbeat and Jen got a good look at the rest of his powerful, muscled frame and found herself getting turned on. His musk filled her nostrils and in her temporary body she discovered that she loved the smell. Her pussy was wet, her own cock was hard and any thought of escape was gone from her mind. The stallion was going to fuck her and Jen was more than willing to let it happen.
The stallion whinnied and Jen understood it as an instruction to suck his equine prick. Her mouth salivated at the thought of swallowing that two-foot monster and she made an exaggerated motion of licking from his balls all the way to the tip of his cock as she rose to her hoofed feet. When she reached the tip she wrapped her lips around the flat head and lunged down. Jen found that having a mouth that was a foot long had its advantages in situations like this as she easily engulfed half of the stallion's cock. The flavor, which was a mixture of musk, earth and pre-cum, surprised Jen as being one of the most wonderful flavors she had ever experienced. She quickly discovered a second advantage to her transformed mouth as the taste buds on her long, wide tongue were all stimulated at once. Her eyes rolled up into her head as her tongue practically gave her an orgasm from her new favorite flavor. She sucked on the equine cock like a starving whore and felt her addiction to sex growing with every bob of her head.
After a few minutes of enjoying his first blow job ever, the stallion yanked Jen's mane-like hair and pulled her eager mouth off of his prick. He stared straight into her submissive eyes and whinnied another instruction, and Jen immediately turned around, bent over and presented the blackened lips of her twat to him. The stallion placed his cloven hands on Jen's shoulders as though he was mounting her and plunged his mighty cock into the heated depths of her cunt. Jen could feel the cock pushing all the way up to just behind her tits and she marveled at her new ability to fully transform to suit any sexual situation. Her moans came out as whinnies and she only got loader as the stallion got rougher and rougher with his fucking. Her tits bounced wildly from the jack-hammer pounding, causing milk to fly from the tips of her blackened teats, splattering all over her legs and face. Occasionally one of her huge tits would smack into her own equine prick and she would let out a heightened shrill of pleasure. Jen was enjoying every moment of her humiliating, bestial fucking, but it came to an end all too soon as the stallion pumped gallons of seed into her body. Her own cock erupted in a geyser of cum, and her screaming whinnies echoed off the distant hills.
The stallion withdrew, and for a moment Jen yearned to be stuffed full again before the gaping hole that was her mare-cunt slowly tightened back up again as Jen returned to human form. Her cock withdrew into its sheath, and then the sheath transformed back into foreskin. She watched her nipples lighten from black to brown to bright red and finally back to her normal pink. Her whole body tingled with erotic sensations as the changes washed over her and Jen felt herself getting aroused again. She immediately chastened herself for enjoying the experience but she knew that it wouldn't take many more encounters with animals before she would crave the addictive pleasure of transformation. She hated Kyle for doing this to her. She wanted revenge.