All persons involved are over 18 years of age.
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In the dark, deep recesses of the Earth, I rest. Only the slightest, dimmest awareness of movement above perturb my slumber. I hear rumblings of the many flesh creatures far above. But it is none of my concern and I resume my slumber.
But the disturbances grow louder. Strange limbs of steel and resin tunnel deep down and shake me and my brethren. My sleep breaks and my curiosity could only grow. Strange veins of metal extend downwards. The sound of fluid rushing through these vessels is persistent and loud. More shaking and loud voices from above further pique my interest.
I investigate and find an opening in these strange veins that the steel limbs planted. I am swept away by the fluid. To my dismay, I find the current is too strong. The sheer speed of its motion begins to tear and dissolve me. There is nothing I can do against such force but writhe in pain and be swept away.
I do not know how far I traveled down this torturous path, but at the end is a strange bipedal flesh creature bathing in a rectangular stone chamber. It lets out a complex series of sounds, not like the great animals I recall. But I can recognize the sound of fear and panic anywhere. I know the flesh creature will finish me off, as any creature would in self-defense. The flesh creature's two eyes open wide and its mouth emits a primal shriek when I emerge through several small parallel openings into the chamber. I cannot fault it. Some fears are well justified.
My weakened body can only allow the force of the current to push me into the creature's mouth. My conscious mind burns in pain, so it is by instinct alone that I wriggle my way in. The flesh creature's throat bulges and distends, and the flesh creature's limbs attempt to strike at my position inside it, to no avail. The flesh creatures spent millennia of evolution locked in battle with my kind, and only a proactive defense ever prevailed. But it is much too late for that.
The flesh creature convulses, and moans in pleasure as my secretions take hold inside it. I surmise this evolved in my kin to prevent vomiting but became so much more. All resistance ceases and the creature slumps over with its head pointed up to encourage my journey up and into its mind. I gratefully make my way deeper into the being and take everything that I can. Mind, body, everything. The creature twitches and groans despite the violation. The sensations I cause in this creature have left it utterly defenseless, and by instinct, I proceed upwards, into its brain. I feel myself entering her skull cavity and then my entire body explodes into a burst of new senses and new information.
I startle awake, open my new eyes, and breathe with my new lungs. The running water jolts me with its force, but it does not hurt me anymore. I reach forward with my new forelimbs and turn off the... shower, it is called. My limbs shake in the absence of heat.
I curse in the creature's language at the cold and exit the shower.
A curious reflective surface presents itself within a larger chamber. I startle at the bizarre creature contained within, but my new brain assures me it is her reflection. Well, my reflection.
My body is a pale woman with shoulder-length red hair, freckles, and a mischievous smile. She has a slim build, save for generous hips, and her breasts look plump and firm. I confirm this with a quick grope of my hands. She is a beautiful human woman. I am what is called a human now. I am Denise. Yes, that is my new name, I silently repeat to myself with her luscious, full lips.
My hands continue massaging my breasts. Her body rewards me with a jolt of pleasure when I apply the right pressure. I make that smirk on her face, the one that drives boys mad. Yes, this body will more than suffice. I finish playing with her tits, rejoicing in the gorgeous sight. Her crotch gets damp, and I shift my attention there next.
My new mind remembers digging into herself for pleasure, and I re-enact this to the same result. My fingers go in and out of my slit and grow steadily even wetter than the rest of me. I quickly forget the cold as I shiver instead from delight. I particularly enjoy the sight of a beautiful woman in the throes of passion right in front of me. However, it is difficult to keep my gaze on my reflection with all this movement. I shove my fingers in a furious pattern until orgasm overtakes me, and almost manage to suppress a moan.
A female voice blasts me from outside the door. "What the fuck! Denise, are you fucking yourself in there or something? Hurry up and let me take a shower!"
Ah, my bitch of a housemate: Simone. Denise does not like her, and I am inclined to agree.
"Ugh, I'll be out, give me a moment," I say.
"Whatever, just hurry up!", Simone replies from outside.
For that, I'm going to take my time. I towel off Denise's body and retrieve her makeup from behind the mirror cabinet. I make sure to accentuate Denise's bright green eyes with quality mascara and nightshadow. I flatter her lips with a nice dark red lipstick. Her hair, I fashion into a sporty arrangement, and add a cute little silver hairclip to tie together several of her bangs. I wink at myself and admire my beautiful new form.
Simone starts banging on the door. I don't particularly care, I have my entirely own sense of urgency. I enjoy the way Denise's hips sway as I move her back to the shower.
The remainder of my original body remains there, twitching on the cold tile floor. I pick them up with Denise's dainty hands and bring them up to her lips. I shudder in pleasure as my own aphrodisiac secretions tingle down Denise's mouth and throat. I should still have enough mass for quite a bit of fun tonight.
Now that the shower is clean of all evidence of Denise's takeover, I wrap a towel around Denise's body. There is still enough of her left bare to enjoy one last glimpse in the mirror. I sashay my host over to the bathroom door and open it.
"Finally," yells Simone. "Bitch," she mutters under breath.
I pretend not to hear. As I get a look at her, I remember the other reason Denise doesn't like Simone: Envy.
Simone is tall with long, curly blonde hair. Her legs are deliciously long, beginning in a tantalizing curve of her hips and ending with perfect, toned calves. Her eyes are a brilliant blue and her face slim, with pleasant features. She is currently wrapped in a towel much like I am.
"Move out of the way. What are you staring at?" she yells at me.
"You look really beautiful, Simone," I say.
Simone sputters a little, and blushes. Excellent. Denise never compliments her on her looks, at least not sincerely.
"T-Thank you?"
"Sooo, I had a thought." I play a bit with my red hair. "What if, instead of going out separately tonight, we just stay here?"
"Stay here?", Simone asks.
I tilt Denise's head to the side and give a slight smile. "Uh-huh. Just you... and me.", I say huskily. "All alone, the entire weekend together."
I lean forward.
Her eyes go wide, and Simone withdraws a little. "What the hell? Denise, are you hitting on me?"
"Well, you look so hot right now, Simone," I reply with an impish grin. "You're so beautiful, and it makes me so jealous. I'm sorry, but that's why I've always looked at you that way. You're gorgeous and wonderful and any man or, especially, woman would be lucky to have you."
"Ugh, what?! What the hell has got into you, Denise?"
I grin ear to ear.
Simone expects me to reply, but my only answer is to seize her with both hands and plant a kiss. My tongue forces her lips open and I feel something familiar rise up. I shudder with pleasure as a piece of my true body bursts out into my mouth. I pin her to a wall and continue kissing her. The towels fall from our bodies and I enjoy the sensations of my naked body against hers. A thick black slug, just like the one that took Denise, squeezes between our lips.
Simone at first lets out a muffled protest and struggles against my grip. Her fighting slows and slackens, and then she spasms for a split second. I continue delving every nook and cranny of her mouth with my tongue. Her throat bulges as my slug forces its way down. Then the blonde beauty's hands stop fighting mine, and she begins to lean forward. I allow her hands to break free of mine so that they can wrap around my host's waist. We continue to make out for another minute, this time with her full enthusiasm.
Simone pushes free of the kiss with a wide grin. Saliva trails between our lips. I look out of two pairs of eyes at both girls' faces. I can feel both girls' nude bodies pressing against each other. Both are slowly getting wetter at the promise of much more contact.
"That's what got into me," I say with Denise's mouth.