slime time

>Marina took a great amount of pride in her work
>Sure, it's true that her work involved performing unethical experiments on sentient creatures, but that didn't mean she couldn't be proud of it
>As the one among her sisters that specialized in biology, she found herself fascinated with the inner workings of living things
>It may not have been as flashy as Molly's engineering, or as elegant as Medusa's chemistry, but Marina loved it all the same
>Though the scalpels and hacksaws might have seemed barbaric to an outside observer, there was an artistry to what she did that just couldn't be appreciated unless you were intimately familiar with the subject like she was
>Regardless, Marina never minded the apparent crudeness of her profession anyway. If anything, she relished it
>There was a part of her that never quite evolved past the primal, visceral satisfaction of seeing blood and guts spilled by her hand
>To describe the pleasure she got from this as orgasmic would only be slightly exaggeratory
>Of course, when you've lived as long as she and her sisters have (long enough that they've stopped keeping track), even that could get boring
>It's for that reason that Marina took to experimenting on herself

>She started small at first: extra limbs (tentacles in places where there shouldn't be tentacles), altered sensory input (what if everything tasted like chocolate?), and mass redistribution (this one was just an excuse to give herself a ludicrously huge chest, which was fun until she realized that working around it was a pain)
>It was all child's play, really
>But above all else, a scientist had to push the envelope
>So Marina cloistered herself in her lab for a week straight, dedicating her entire being to the project that would be her magnum opus
>Her sisters were impressed, albeit concerned; it was uncharacteristic of her to spend so much time and focus on a single endeavor
>Marina, although brilliant, was capricious at best and erratic any other time
>To throw herself into one thing so completely? It was unheard of! This must've been a big deal

>"I can't wait to see what Marina has been working on!" Molly titters as she and Medusa travel to Marina's lab. "It's so unlike her to spend so much time on an experiment. It must be something truly exciting!"
>"Probably something freakish." Medusa says in her usual deadpan
>"Well it just wouldn't be Marina if it wasn't freakish, would it? Fufufu~"
>After a few more minutes of walking, the two arrive at the entrance to Marina's room. Molly knocks on the door while announcing in a singsongy tone, "Sister, we're here! Is your surprise ready?"
>"Hell yeah it is!" Marina calls out from instead the room. "Get in here already!"
>Molly opens the door, and she and Medusa are met with the sight of...
>Marina standing proudly in the center of the lab, her tentacles on her hips. She looks at her sisters expectantly
>Molly blinks. "Um..."
>"Where's the surprise?" Medusa asks
>Marina grins wider. "You're looking at it!"
>A moment passes
>"I'm afraid I don't understand, sister." Molly admits
>"Oh for the love of-- LOOK!" Marina

>With ferocity akin to a wild animal, Marina pounced upon Molly, pinning her to the floor. The way she straddled her left her turgid length nestled between Molly's bosom, and that pulsating heat against her chest stoked her blazing inner fire even more
>"Goodness, Marina!" Molly said, nearly breathless in her lust-addled state. "I've never seen you so worked up. What's gotten into you?"
>Marina grinned ferally down at her prey. "Nothing compared to what's about to get into you. You said you wanted a closer look, yeah? Well here you go!"
>A quick shift of her position on top of her sister brought Marina's rod from the valley of Molly's cleavage up to lay across her face. With every breath she drew Molly was forced to take deep whiffs of Marina's unfiltered arousal, and the all-encompassing scent was rapidly reducing the scientist's brilliant mind to mush
>"How's the view up close? Enjoying yourself?" Marina said, still grinning beastially as she rubbed her length along Molly's face. The lustful high of dominating her sister so thoroughly was making her giddy, and Molly's complete submissiveness only spurred her on even more

#

>Molly had long since been reduced to little more than a groaning ragdoll, her constant vocalizations wavering and increasing in pitch whenever her sister thrusted forward. What strength was left in her body was being used to clench tightly around Marina and wrap her lower tentacles around her in an approximation of a leglock