Rachel laid there, lightly squeezing her breasts as she recovered from the powerful orgasms the dildo had forced out of her. Her pussy and asshole throbbed gently, lightly tugging on the buttplug and dildo, pulling them tight against her. Waves of warmth flowed through her from her filled womb as her body absorbed more of the magical cum.
"cumslut..." she moaned again and again as she felt the warmth inside her grow, "cum...."
Her mind was now singularly focused on cum, reveling in the pleasure of being filled so completely while her malleable mind and body started to reform.
Her hips were first; tingling with a strange sensation that made Rachel sway them back and forth shaking her ass gently in the air. Each movement provided a sensation of relief as her rear swelled slightly—first tensing with taut new muscle before rippling out with soft fat. She smiled as she realized she was growing a nice plump ass, excited to grow closer towards the new identity the dildo kept imprinting into her mind. Her hips continued moving in smooth motions as she willed it to keep growing before a tingling in her thighs compelled her to stop and stretch her legs out. The strange warmth then spread throughout them, and with a rhymthmic tensing and relaxing of her legs they grew and grew until her already athletic legs swelled out to curvy feminine perfection. After one final cycle of tensing and relaxation she smiled, satisfied with the newfound strength of heft of her hindquarters—perfect for riding cock.
As she felt the warmth begin to flow into her chest a stray thought briefly flew through her mind—why she hadn't pulled out the buttplug and stopped all this earlier? She could have stopped this... she could have prevented... whatever was happening to her... but she simply smiled as her overwhelmed mind assured her that she had always wanted this—that she had always wanted to be a useable fucktoy—freeing her to liesurely keep playing with her breasts, awaiting their impending change.
She squeezed, massaged, and pulled at her breasts as she began to feel them fill her hands more fully, until they became more than her hands could hold. "Huuuge..." she moaned to herself as she realized they were big enough for a titfuck. With the image of hard cock stuffed in her cleavage pushing up toward her face in her imagination, she squeezed her swollen nipples firmly, burning the image into her mind with pleasure. This triggered one last growth spurt in her already voluptuous chest, which pushed her over the edge again and forced yet another orgasm out.
An ecstatic "OOOOHHhhh yyyeeessss..." escaped her lips before she collapsed down onto her side, giving her massive tits some room to relax, while simultaneously twisting her hips to account for their newly gained width. Completely exhausted, she just basked in the afterglow of transformation and multiple orgasms, breathing deeply and slowly until she drifted off to sleep with a content smile on her face.