Tyler had to pee pretty bad. He had just sat through a two hour sociology class, with the later half being a quiz that he couldn't leave early from, even to use the bathroom. It was a pretty boring class and he had had a coffee beforehand to make sure he stayed awake. He needed to get a good grade in it to keep his scholarship and the coffee was supposed to help him pay attention.
As he made his way to the men's bathroom and opened it, he was hit with a powerful scent. He paused in front of the door and tried to identify it. This was different than the usual man-smell he was used to from bathrooms. It was pungent and hung heavy in the room. He could definitely recognize the scent of pussy, he thought. Maybe some guy had pulled his girlfriend in there and had some hot and sweaty sex in one of the stalls. But there was a difference between this smell and any vagina had encountered. This was musk laden and almost reminded him of a barnyard for some reason. With each inhale he could feel his cock growing in his pants as he forgot about his previously emergency need to pee.
With his eyes closed and his concentration on his sense of smell he didn't notice the figure approaching from behind him. A wet hand came up in front of his face and quickly placed itself over his mouth
"Mmph!" He tried to say, his eyes flying opening with shock as another hand started massaging his crotch. He was thinking about resisting, but that smell was so good, so inviting, like it made him want to fuck something, anything, and the lubricated hand in front of his mouth was covered in it.
""How do you like that, stud?" Whispered Rachel in his ear, her hand still grasping his penis through his pants.
"Mmm I'd say it's not bad. I definitely want to meet its source." He opened his mouth and licked her hand, getting some of her salty musk laden juices on his tongue. This only served to further his lust as his penis throbbed in his pants. He swirled the taste around in his mouth and reached down to place a reassuring hand on Rachel's hand.
"I'd say that can be arranged. What say you help me out with something first though?"
"I'd say that can be arranged too."
"Perfect! Then open wide stud!" With one quick motion Rachel released her hand from his mouth and scooped up some of the liquid that her slavering pussy was producing. She then tilted his head back with her other hand while the fluid filled hand poured its contents into his open mouth.
"Ooohhh mmmm!" He moaned as the pussy juice ran into his mouth. The scent of it was bombarding his nostrils and the taste was driving him crazy. Tyler's lust skyrocketed. He greedily drank the liquid like it was the fabled ambrosia. His thick cocked swelled even bigger, creating an obvious tent in his pants. He could not stand it any longer and spun around, pushing Rachel to the floor and throwing her legs wide. He dove into her pussy and began hungrily eating her out. In his haste he did not notice the obviously anatomically wrong color and shape of her equine genitals, but if he had it would not have stopped him. He was far past caring what she look like down there as long as he could get more of her musky fuck sauce.
"Ohhh yesss! Lick me faster, harder, come on get in there!" Cried Rachel, throwing her head back. She had not anticipated this part happening in her planning, but was not displeased. This would actually help further her goals. She had thought this through and figured that if her transformation had been induced by cum, then maybe her sexual fluids would have the same effect on someone else. Even if a normal man would be no match for he now enlarged matte-black pussy, she could make him a perfect match for her. She was not therefore surprised when Tyler started snorting and making slight whickering noises between her legs.
Tyler was proficient with his tongue. He darting it in and out of her hot fuck tunnel then dragged it up her lips to draw circles around her clit with it. He was getting more and more of her hot juices and loved every second of it. He couldn't really pay attention to much else than pleasuring the woman in front of him but would have noticed his dick growing increasingly too big for his pants if he had. His mouth, covered with her slime, started to melt into his nostrils as they grew wider and his face pushed out into a short muzzle. Tyler pulled his head back from her sex and curled his upper lip up, drinking in her scent. He suddenly realized he could smell her and the potent musk she was producing much more completely, like he could smell all of her lust and arousal and that she wanted him more than anything in the world right now and would do anything he said. He flared his nostrils and snorted, then stood up, removing his now-too-tight jeans as he did so.
"Turn around slut." Tyler said in a commanding voice. A nub grew above his darkening asshole. His massive cock was standing upright and dripped pre-cum from the tip. It was eleven inches long now and had dark patches contrasting with the bright pink It was. The head was flared wide and a thick median ring adorn the middle of his shaft.
"Mmmm anything you say" Winked Rachel and she turned around, presenting herself to Tyler. Her vulva winked open and closed, demonstrating her intense arousal. Tyler stared mesmerized by the sight. He noticed the butt plug then and was immediately irritated by it. "This will only get in the way" he said and firmly grabbed it, slowly pulling it out to Rachel's disappointment. Her asshole had changed completely from its time before being penetrated by the butt plug to now. It was a perfectly round and extremely puffed out, looking like it belong on the hindquarters of a horse. A small tail had also grown in above her hole and was waving back and forth in the air. Tyler grabbed it firmly at the base and leaning in close to her ass to drink in her pure scent. He placed his nostrils at the base of her tail and inhaled deeply. A larger than normal tongue reach past his now blocky teeth and lapped first up her pussy then continued up to her asshole, getting a good taste of her musky asshole. Rachel moaned and threw her head back, letting out a soft whinny herself.
She suddenly felt the urge to pee. "This'll really drive him wild" she thought and let loose a stream of steaming yellow liquid. The sight and smell of it hit Tyler full force. Some of it hit him right on the muzzle and the strong pungent smell of her pheromone laced urine stunned him. He could not take it any longer and whinnied loudly. Grabbing his meaty rod that was now thirteen inches long, he pulled it up and down across her lips to get it wet then slowly pushed it in. His feet had cracked through his shoes and were now solid black hooves. The tail above his butt had now grown and was laying flat across his ass. His ears had moved to the top of his head and were now pointed and dusted with fuzz. The same changes were happening to Rachel and she was loving every second of it.
"NEEEIIIGHHHH!!!" She screamed as inch after inch disappeared into her. Her cunt sucked it up like the hungry tool it was and she pushed back in time to Tyler's thrusting. "Ohhhh yes fuck me! Fuck me make me your good little slut horse! Make me your mare!" Her tail was fanned to the side and Tyler took the opportunity to place his thumb on her puckered asshole, pushing it in and dominating her even more. His other hand gripped the side of her ass as he rode her hard. His hair had grown into a long black mane that traveled down his back. He grunted and snorted, feeling the semen churning in his testicles that were now the size of softballs. The black scrotum that contained them hung low and smacked Rachel in her clit in time with his thrusts, furthering her pleasure.
"Yesssss fill me! Give me your seed! Give it all to me!" Screamed Rachel. She could not wait anymore for him to come and let out a loud "NEEEIIGGHH!" pushing back hard on his horse cock, burying as much as she could of it in herself. Tyler could not take anymore and erupted his load, ounce after ounce pulsing into Rachel's insides. He whinnied too and pulled her in tight to him with his left hand while he buried his thumb up to his palm in her ass with his other hand.
He stayed in her as they both panted for a moment. Their explosive sex session had left them both momentarily exhausted. Tyler's hard horse shaft slowly softened and as it did he straightened up and pulled his hops back from her waist. It flopped out and drooled a little bit of cum onto the floor. Rachel turned around to face him. She did not have the same muzzle as he did but her ears sat on top of her head. She had discarded her sweatshirt some time ago and her large breasts rested heavily on her chest. The nipples that adorned them were black as night and hard as a rock. Her perfect figure was accentuated by her luxurious tail that hung behind her and her entirely black sexual organ. Hard hooves adorned her feet.
"Mmm you made me into such a hot little slut. Why don't you come back to my place? I know someone that would love to meet you!"