Despite his lust-fueled haze, he managed to recognize some things about the creature before him. It was just as tall as he was, and heavily muscled despite its slim appearance. It's smooth, wet skin shone in the little light that the room possessed, and it was definitely quite female in every way save for the cock that was slowly emerging from its wet vagina. He blinked in surprise, but as it completed its emergence, the thought of fleeing never crossed his mind. Instead, he leaned onto his arms and spread his legs, his own cock still dribbling precum despite its stiffness. With deliberate slowness, the creature lay on top of Jerry, its wet manhood sliding into his ass as it gazed with starry eyes into his own.
It felt wonderful to Jerry, as if some kind of lifelong dream was finally in motion. Its girth and depth was neither a surprise nor a shock to his newly-refashioned brain, and soon he was leaning back with soft moans as he ground his hips against his alien lover. He could feel his body continuing to change, but the pleasure was simply too much for anything else to come to mind. With the barest of awareness, he felt his chest slowly but surely swelling, his bosom becoming quite prominent as his manhood's newly inhuman girth caused its tip to barely brush against his newly-fashioned underboob. His gasps of pleasure seemed to synchronize with the waves of warm, humid air brushing against his newly-smoothed scalp.
He could feel his alien lover already at the brink of its first orgasm in his ass, its cock's surface somehow morphing with each thrust to better push his sensitive inner muscles into sensory overdrive. With a final, explosive grunt, it came into him, and all Jerry could do was hold on as spurt after spurt of alien DNA filled his - no, her now - body. She could only groan and cum in response, her cock erupting with one final burst of seed as her refashioned body blasted her brain with pleasure.
With a wet pop, the creature slid free of Jerry and paused, seemingly admiring its handiwork. Jerry was certainly its creature now, and more changes were making themselves slowly, but surely apparent. Her body had finished its initial transformation into physical womanhood, and her cock had begun its withdrawal into her newly-formed vagina as it continued to drip with her seed. Soon, whatever vestiges of humanity Jerry had before this would be gone, replaced only by a drive to hunt and breed.
It began to sniff the air for the scent of fresh prey when it heard a horrified gasp behind it. As if on cue, it exhaled a nearly invisible cloud of pheromones into the room, slowly turning around to see the noise's source. After a few moments, the creature finally settled its gaze on Lana, immobilized with surprise and horror at the sight of her transforming boyfriend. She could only hold on to the railing of the stairs as her brain tried to make sense of the scene before her. But unbeknownst to her mind, her body was already reacting to the alien DNA in the air, and it was only a matter of time before she surrendered to them.
The creature seemed to smile as it bent to leap onto its newest victim...