Florence felt her pussy dribble with excitement at the prospect of fucking Leia. Only the most depraved sluts would dream of getting their cunts stretched and ruined for human lovers, and Florence was finally accepting that's exactly what she was. If she could remember the repressed old woman she'd been just a short time ago, she'd have been horrified, but reality had altered too much now.
The nozzles flared to life and a cloud of pheromones enveloped her. Her skin glistened as it absorbed the potent fluid and she ran her hands over her body. Her nipples, already thick and long for a human, extended further, and the emptiness inside her body deepened. Her lower lips parted into a small, natural gape, and new memories of regularly fisting herself implanted themselves into her mind.
The memories bloomed. She'd been preparing herself for this moment. Ever since she'd laid eyes on her first slutmare she'd wanted to feel their enormous cocks inside her. She was obsessed to the point of moulding her body into the perfect cum dumpster for them. Toys and fists had stretched her cunt beyond recognition. Regular milkings and jizzcream had ballooned her tits into obscene jugs. The daily juice-sprays had altered her very scent and amplified her libido beyond the edges of sanity.
Two nubs grew below her tits and swelled. Florence groped the budding breasts and smiled. The juice-sprays had done far more than just make her a nymphomaniac that smelled like a horse in heat. It had turned her into a freak. A nub developed at the base of her spine grew and hairs sprouted along it to form her new tail. She swished it from side to side and continued fondling her lower breasts, that were now half the size of her mammoth original pair. She was a freak, and she loved it.
Much to her delight, and Dorris's dismay, the doctors had said the changes were irreversible. All of the pheromones that had entered her bloodstream across the course of many juice-sprays had altered her biochemistry and triggered a second puberty, activating the dormant parts of the genes humans shared with the equines from before the point of their split in the evolutionary chain. She was not quite an equine, but she was no longer human either.
Florence stepped out of the booth. Her powerful scent washed over Leia and the towering slutmare was reduced to her instincts as her cock surged to life. Three foot of horse cock jutted out towards Florence and the former human licked her lips.
Leia launched herself at Florence. She picked up and hurled the four-titted whore against the wall and rammed her cock inside the gaping snatch. Florence immediately came and went limp like a ragdoll as her mutated love tunnel swallowed every inch of the thick, spongy shaft. Her eyes rolled up into her head and she drooled as the last vestiges of her old life were overwritten with her new purpose.
Florence's eyes fluttered as she regained consciousness. She was still pinned against the wall, bouncing up and down on the mighty cock. Her thoughts turned to the churning balls slapping against her ass and the potent load of spunk they contained. She could practically taste it. She felt an odd sensation within her body and she instinctively knew it meant she was ovulating. Her cunt had mutated to the point of being fertile once more.
'Yes! Yes! Breed me!' she screamed. A dull pain throbbed inside her. She needed to get pregnant so badly it actually hurt. It was her only purpose in life now. She wrapped her arms around Leia and mashed her lips against her in a fierce kiss. Muscles inside her snatch rippled and milked the slutmare's cock. She'd done this to herself, and she loved it!
Leia couldn't hold back any longer. She didn't want to knock up Florence, but it was beyond her control. The new broodmare needed her spunk and was made to milk it from her. She had no choice but to comply. Seed rushed up her shaft and flooded the depths of the ovulating slut.
Florence bashed her head against the wall as she threw it back to scream. An orgasm unlike any other wracked her body and she convulsed in ecstasy. Milk sprayed from all four of her teats, but her snatch remained tightly clamped around Leia's shaft and let nothing out. Leia pulled away and she crumpled to the floor, still shaking and leaking milk, but her cunt sealed tightly shut with just the slightest dribble of escaped baby batter.
When the twitches stopped, Florence's eyes focused on the panting Leia and she licked her lips. She pushed herself to all fours and crawled towards the slutmare, who was leaning against the far wall. Her tits swayed from side to side until she reached her impregnator. She lovingly licked their juices clean off of Leia's shaft.