Fuck Alex's body while the transformation completes

Stacy's cock still throbbed madly, hungry for somewhere to release its seed. Stacy's tongue had already fed, and even now she could feel the faint twitch of a new life forming in her chest. She needed to fuck something right now.

She felt her gaze focus on Alex's prone form, on the flaccid cock resting against one sweat-coated leg and the pussy that still dripped beneath. She could see its alien lips gasping silently in time with Alex's breath, begging to be fed.

Stacy's legs carried her back onto the bed and she felt herself crawling forwards until she was directly over her "boyfriend's" **** body.

The changes had already begun. Broad shoulders were narrowing, masculine facial features lost their rugged edge and the hair across "his" body had turned fine where it did not disappear entirely. Already "he" looked soft and inviting. Stacy's body bent down and breathed deep, the heady cocktail of sex making her mind buzz.

Alex already smelled like a woman.

Whimpering with desire, Stacy's hands guided her cock slowly to Alex's slit. There was no need for care or consideration here: The worm within him could only feel pleasure, its flesh pliable and resilient. Stacy kissed its lips with the head of her cock and thrust.

The sensation of being buried deep within the warmth of another being, of having her dick massaged and sucked by the alien pussy of her former boyfriend drove Stacy mad with pleasure. Her body shook with the effort of moving through the numbing ecstasy, filling the room with a wet slap, slap, slap as she fucked "his" senseless body.

Alex jerked with each thrust, "his" breath coming out in grunts as "his" body was assaulted. Stacy watched through a fog of lust as the wrists in her grasp shrank beneath her fingers, the waist below her thinning while hips swelled outwards. With each lunge, Alex's chest became softer and softer, "his" nipples looping up and down atop a pair of jiggling breasts.

Stacy wanted to cum, desperately wanted her body to pour itself into what was rapidly becoming a beautiful girl before her eyes, but the creatures controlling her simply continued pounding away mindlessly into the unconsciously sucking slit.

Her eyes widened as she - no, her cock - tasted something. A hint of impurity in the juices her dick was drenched in. She felt the knowledge flow into her as her cock's thoughts invaded her mind.

The transformation is not yet complete.

Alex had begun to moan softly, "his" voice plaintive and feminine as it escaped through inviting lips. Stacy leaned down and kissed "him" and felt her tongue taste only the slightest hint of maleness left in "his" body. It wrapped itself around Alex's own, massaging the inside of "his" mouth while Stacy's hands rose to mash the breasts that rose from "his" chest.

A tension began to suffuse the body trapped beneath her, a sense of primal urgency as the last shred of Alex as an ordinary man was consumed, replacing every cell, every shred of "his" being with that of an angel dominated by the monster within.

Stacy tasted the change, tasted the last morsel of Alex's maleness as she opened her eyes, tears running down her face as she awoke in a familiar embrace in an unfamiliar body.

There was the briefest moment of horror in Alex's eyes before she came, the sudden onslaught of her new body's sensations consuming her in an instant, causing her entire body to seize up and spasm in Stacy's arms. Stacy felt her tongue and cock rejoice within the flesh of their creation, and the crashing wave of her own orgasm burst from her loins, her mind going blank as her world was reduced to the sensation of juices flowing - pouring out of her and into the exquisite creature that had once been her boyfriend.

Alex gasped, her voice coming out in choked whispers before she passed out once more, her body exhausted from completing her transformation.

Stacy's arms let the limp form slump onto sheets soaked with sweat and sex, tired but exhilarated as the creatures within her exulted. Her body staggered to the bathroom on shaking legs before collapsing under a cascade of hot water, the slime of two bodies dominated by three parasites gurgling down the drain.

Stacy had lost all sense of time, but the light through a fogged glass window told her that it wasn't even sunset. Had so much really changed in such a short amount of time? Her limp cock twitched faintly when she thought of what she'd done to Alex. She didn't know what she would say when... she awoke, and wasn't sure she wanted to be here when that happened. They'd been a shy couple, but now that this had happened...

An alien certainty of purpose filtered into her thoughts.

Your misgivings are irrelevant.

Stacy slumped, the helplessness of her situation returning once more.

*You will become one with us, and we will become one with others. There is no other consideration."

Stacy raised her hand to her face. She couldn't tell when control had been returned to her, but with no actual target to fuck, it seemed that her body had no reason to dominate her actions. She held her hand up to the bathroom light, felt the falling water striking her flesh and trickling down her arm.

Even now, it felt alien to her. In a way, it was. Stacy had become a spectator in her own body, granted control only when behind the scenes. "Stacy" was someone else entirely.

She washed slowly, deliberating over every inch of her skin, wondering despondently at how the body she had spent her whole life in now felt like a stranger's empty house. She didn't belong to herself anymore.

Stepping out of the shower, she dried herself off and stood naked in front of the mirror. A strange sense of déjà vu struck her, and she remembered looking at herself as a blissfully ignorant but free woman. Now, alien eyes stared back at her as though from another world.

Stacy felt as though something were expected of her, and once again she felt the knowledge flow into her mind from her body's new owners.

"I... I surrender myself to you," she stammered, feeling her hidden cock twitch gleefully at her submission.

"Command me."