Kylie moaned as she guzzled Jen's hot cream. She just couldn't get enough of it; it was too good! Jen could feel Kylie's muzzle lengthening out over her cock, and she tilted her head back as her pleasure was amplified. Suddenly plump lips sprouted out from the end of Kylie's maw. A long dexterous tongue slipped out and wrapped around Jen's massive member. "Aah- what's even happening down there? Woah!", her eyes rolled around the room, lost in pleasure.
Jen shrieked as she felt herself being lifted into the air. Kylie was holding Jen up by her legs, sucking her off while standing up. From her view, Jen could see that Kylie's hair was growing rapidly, fluffing up as it covered her eyes. Two equine ears sprouted out the top of her head. She was looking horsier by the second! Had something changed in the virus to make it more vigorous? Her train of thought was lost as she was bounced up by Kylie's arms, probably to readjust weight. Jen noticed that the horse woman sucking her dry was getting more muscular, making the edges of her body look rougher and more defined, but that quickly changed as dark fur sprouted out across her features, softening her look.
Before she knew it, Kylie was finished sucking, and Jen was on the ground with a thud. She winced as pain tingled through her rump. From here she could see that Kylie's feet had morphed into cloven hooves, they were large and quite shiny. Kylie licked her juicy lips clean and then smiled as she looked down at Jen. She had had her fill and her transformation was complete- for now at least. Jen was helped to her feet by the big breasted horse amazon, although she had a little trouble standing up after the recent events. Jen noticed that Kylie was more than twice her size, her face in line with Kylie's cock, which seemed to have changed too, becoming a mutated version of its former self. Clear fluid constantly dripped from the tip, and every so often the hole would clamp tightly and shoot out a fine mist of the intoxicating cream across Jen's face. The scent was so strong, so filthy, and yet it was so good. Kylie's firm rod was covered in rings of nubs, which would twitch and shake of their own accord. The massive thing was shoved inside Jen's mouth without a moments notice.
It had slipped inside of her so easily, and once there, the nubs on the tip of Kylie's mutant member became engorged with blood, stiffening them and making them swell in size. The nubs twitched around a bit, ensuring a proper seal had been formed. Then, Jen felt Kylie's hands being placed on her head. They were huge, almost too big to rest there comfortably. With them on top of her head, Jen noticed that they were perfectly symmetrical, with a thumb on either side, and she had eight fingers instead of ten. With a riotous shudder, gallons of cum began to be pumped, literally, into Jen's mouth. It was physically impossible to not swallow as the sheer pressure forced the tainted spooge deep into her body. She moved her hands up to Kylie's wide hips for stability, they were like tree trunks covered in dark fuzz.
An ear piercing whinny drove through Jen's skull as she felt the new virus taking hold over her body. She swelled in size, and the same changes that happened to Kylie came over her too. She could feel her balls swelling to the size of basketballs. Rather than being used to produce sperm, they were repurposed to create and store copious quantities of the horse flu, and to synthesize powerful aphrodisiacs as well. As Jen grew, she quickly became too big to stand and suck, so she dropped to her knees on instinctual command. Jen's mind was becoming warped, her intense desire to fuck and to be fucked was being twisted to be a method of spreading the influenza as much as possible. She found herself wanting to spray her hot seed into as many different people as she could. There was just so much inside her and she felt so full. While she had already been overtaken by lust, a deep need to spread the disease was rooted into her soul as well.
An audible pop made Jen's new, more sensitive ears twitch; her transformation was complete. She was helped to her feet, hooves now, once more by Kylie, but this time she stood as tall as her mate. The two smiled at each other, the same thoughts running through both of their heads. Both took a moment to play with and tease the other's bodies before they set out to fulfil their new desires.