Any horror Allison might have once felt about this situation was melting away, replaced by pure curiousity and even a bit of excitement as she watched the changes take shape. Rachel's body was already a fine work of art, but as she moan and groaned beneath the dual assualt of Catherine and Allison's releases, it started to reform. Gradually, she was becoming something that the once-scared clone now fully recognized as majestic, as a masterpiece of flesh that she'd been incredibly fortunate to partake in.
She had expected that Rachel might begin to grow duplicate, enhanced features, just like Cathenine had when first exposed to the transformative effects of her bodily fluids. This would indeed occur - but not in the same from as the two women relentlessly ramming the orgasming young lady. Instead, she would let out muffled screams as another pair of mammaries quite like Allison's extra pair began to form... and another... and another... and yet another, one pair after another, growing down the length of her torso.
Allison was forced to suddenly pull back as the girl's legs and rear entrance sealed up, practically melting into one long, continuious limb, new rack after new rack forming all the way down its length. She twisted her increasingly naga-like body, presenting a moise, quivering slit positioned between two throbbing breasts; Allison wased no time in ramming herself back into the redhead as she writhed to reach the floor and lay on her back. With Allison straddling her tail, Catherine kept herself positioned so that her own rod would stay deep within Rachel's mouth, pumping load after load of fluid inside to push her transformation further.
Time began to blur and lose meaning as Allison immersed herself fully into the fucking, her shaft endlessly spewing more mutation-inducing cream into the poor woman beneath her. By the time she began to feel herself running out of steam, her enhanced body finally exhausted of reproductive material, Rachel's tail-body of mammaries had stretched back and forth across the lab several times, an endless series of writhing coils with massive jugs spewing milk all around the room. With the final orgasm that her body could muster, Allison found herself screaming before slumping off to one side, Catherine quickly following suit.
As Rachel lay there, basking in the endless pleasure of her new body, Allison made her way over to lean against a wall, panting heavily as she lay in a sticky mess. Her mistress followed her over, looking just as worn out yet finding the energy to wrap her arms around the clone and bring her in for a passionate kiss. It was rough, full of the lust she'd always felt for herself... yet just as brimming with affection, with adoration for the mutated doppelganger. Allison was certain she had never felt more loved than she did right in that moment, hands all over a body that was as much her own as it was Zhang's.
"The effects must still be... highly randomized..." she let out a quiet laugh as she glanced over at her assistant. "Hmmmm... but I doubt she minds..."
"Neither do I," the clone admitted, one hand briefly rubbing her own chest. She loved her body as it was, but she had to admit... there was a part of her that felt envious at the endless amounts of breast flesh Rachel now possessed, all of them so sensitive she might never be able to have a waking moment without intense arousal. "What are you going to do with her?"
"She's been a loyal servant, and she will be rewarded." Looking back at Allison, Catherine couldn't resist the urge to kiss her once more. She was madly in love with her own relfection, and the richest woman alive had no reason to hide such a thing. "I will see to it that her life is dedicated to enjoying the perks of her new body. And as for you..." She sighed gently, barely able to speak between pressing her lips into the other blonde's face. "Our genetics are predictable... anything you want, any change... just... tell me..."