When Samson drank from the stream, it looked like he was having a seizure. Abigail had rushed back towards her parents' farm to try to find someone to get help. However, getting back to the farm on foot was a different story from riding on horseback. At one point, she missed a turn and got a bit turned around.
"I shouldn't have rode out this far," said Abby to herself as she walked through the woods. Her shoulder-length blonde hair was starting to become a little matted with all the sticks that keep poking at her and her white shirt already had a few mud stains. At least her jeans and riding boots were more in place for walking through the woods. Abby got more worried the longer she walked. Sam could be in serious trouble and she couldn't even find her way back home. She wasn't even sure if she could find her way back to Sam at this point.
Just then, she thought she heard what sounded like voices up ahead. This didn't look like the area around her farm, but maybe there were other people could help. She started making her way towards the sound of the voices. She couldn't quite make out the words before now it sounded more like grunting. She walked past a few birch trees and froze when she saw what was making the noise. What looked like a black horse man was groaning as what looked like a cat woman was doing something at his groin. Abby could smell something in the air, a musky odor like when Sam was alone with the mares. The musk made Abby's body tingle a little. She was only 14 and in the beginning of puberty, but the nipples on her small breasts were starting to perk up.
She approached the two quietly. Their eyes were closed and they were far too engrossed to notice her approach. Pretty soon, Abby could see just what the cat woman, no, the cougar woman, was doing to the horse man. She had her large breasts pressed together with the horse man's cock sticking in between them. She was sucking the head of it with considerable enthusiasm. Abby could only just stare slack-jawed at this scene, which was admittedly turning her on. Finally, she found her voice and said, "What the heck is this?"
The horse man's eyes shot open and he saw Abby. "Abby!" he said in surprise, suddenly pulling away from the cougar woman who snapped "Hey!" But as the cock pulled free, a shudder went through before a spout of white fluid erupted from it. However, instead of going on the cougar, it ended up going to where the horse man was now pointed to. Abby didn't have time to close her mouth before the white glob hit her in the face, quickly painting it white. Abby choked and gurgled as it dripped further down her neck, getting her shirt soaked. "Oh no, Abby, I'm so sorry! I didn't know you where there! I was trying to find you but I got distracted!" said the horse man earnestly.
Abby reached up and tried to wipe the stuff out of her eyes. That had got to be the most disgusting thing that ever happened to her. She struggled not to throw up as she thought about what Sam just sprayed on her. She wasn't sure how this horse man could be Samson, but his coloring was right and he did know her. But why she was an anthro she didn't know. But the only thing that mattered was the spunk over her face.
Though despite knowing what it was, she actually found this spunk a little tasty, like salty sour cream. She gulped down what was in her mouth before licking her lips. Once the stuff was out of her eyes, she blinked and looked at her hands, covered with white messiness. Feeling compelled to taste more, she brought her fingers to her lips and licked them clean before wiping more of the spunk off.
As she was tasting her horse's seed, changes were starting to affect Abby. Her ears started to perk up, growing longer and pointed before brown hair covered them. Her nostrils flared a bit as they moved further apart. Light brown hair started sprouting across her body as it grew a little in size. Her riding clothes soon began to be a little tight on her. Once she had cleaned up her face, Abby pulled off her shirt and started licking up the semen on it. Her bra was starting to strain as her breasts grew past the A-cup size they were meant to contain. Her jeans creaked as her ass started to grow too large for them. With a few grunts of annoyance, Abby pulled down her jeans and pulled her boots off. Her toes looked a lot shorter than before as her toenails became bigger, thicker, and darker. Her feet also seemed longer than they were before.
Abby looked up at Samson and said, "Sam, glad to see you're in good health."
"You too, Abby," said Sam, looking at his former rider looking older than before, her underwear stretched tight over her bigger body.
Abby looked at Sam's cock which was half-flaccid. She licked her slightly thicker lips and said, "That was a tasty treat you gave me. I wonder if the whole thing tastes as good." She reached out and grasped the cock before Sam could say anything else. She held the head up towards her face and gave it a long lick. It was just as tasty as the stuff it shot out. She opened her mouth impossibly wide, showing bigger molars than before, and stuck the head inside. Sam gave a wicker of surprise as she felt Abby closing around it.
Abby's mouth shouldn't have possibly been able to hold it, but yet it did. She bobbed her head a bit, getting it a little further inside. As she did so, her jaws started to push. As more cock went in, more of Abby's face went out. broadening and shifting in shape. Her body soon started changing as well. The light brown coat of fur got thicker until it covered her whole body, but it was thin enough to easily see the muscles that were building up. Her bra soon became too stretched as it struggled to contain both Abby's widening shoulders and her swelling breasts. Finally, it snapped off, allowing her large breasts to bounce free, her brown nipples stiff. Her panties were also losing the fight to her wider hips and growing ass. They soon snapped as well, revealing a very wet horse's pussy. Not long after that, a fifth limb started extending from her back, quickly growing blonde hair as it formed into a horse's tail. Abby shifted on her feet as they deformed more, the toes shrinking away to nothing as the toenails fused together and spread around the end of her feet. Her feet stretched longer as they adjust to walking on the hooves she now had. Abby's hair got longer as her face fully expanded into a horse's muzzle, easily fitting most of Sam's length inside.
Sam moaned as his former rider changed into a beautiful mare. "Abby, I'm gonna cum again," he groaned.
Abby pulled the cock out of her mouth and licked her lips. "Not so fast," she said with her deeper voice, "I want it to go where it belongs." Abby had gained a considerable amount of height, standing only a few feet shorter than Sam. She was a magnificent mare with a shiny light brown coat and blonde mane and tail. She was also had quite a bit of muscular build now. Clara noticed with envy that Abby was now as built as she was when she first drank from the stream, but firmer and younger. But still, she was interested to see that the changes could be given to humans and sat back to see how this would play out.
Abby pressed her muzzle to Sam's, kissing him deeply while she softly pushed him back. Eventually, Sam backed up to a stump and Abby pushed him into sitting on it. Once he was seated, Abby positioned herself over Sam, his flat head an inch away from her pussy. "Time to go for another ride," she said as she lowered down. The horse cock went deep into her, causing them both to moan as she eventually sat on his lap, his member deep within him. Abby winced as she felt herself being stretched out. When she finally was settled, she started going up and down, in a pattern not unlike when she was riding him as a normal horse. Sam and Abby started groaning as they started moving together. Sam's hands grasped Abby's wide hips before moving them up her muscular form to her large breasts. He fingered the nipples on them before he place his mouth on one and started sucking. Abby moaned louder as she started picking up speed, spurred on by Sam's suckling. Sam soon started to speed up as well, his thrusts making Abby bounce harder in his lap. Soon, it was like the two were galloping towards the finish line, horse and rider panting and grunting with exertion. Sam's hands locked onto Abby's waist as he thrusted harder. Abby moaned louder and louder before she let out a whinny as she felt herself clench. A split second before or after, Sam let out his own whinny as he pumped a fresh batch of semen out into his mare. Clara was more than a little turned on by this display and it made her wonder what else these changes could do.