Your friend told you it was fun after the weirdness wore off.

It took the tentacles two hours to rehydrate, but they seemed lively as ever. You stared down into the hot water, running a finger along the surface. Immediately the sensation hit you, the viscous tug in the water as your finger dragged just an ilm below. Withdrawing the finger and giving it a curious stare, you stripped free of your robes and stood next to the tub. Your head felt awash with a lightheaded giddy sensation, and you couldn't help but to hesitate before getting in. Void gestalts weren't mere novelties, after all. They were potentially enormous hivemind collectives, with a possible muscle strength capable of lifting two small cars... And they were infinitely curious about the internal geometry of humans. You took a deep breath to compose yourself before slipping beneath the water. The tendrils squirmed by you with little hassle, seeming content to just wiggle around the tub. As you descended into the water, the current gathered a few of the more stationary tendrils on your lap. With a blush on your face, your mind raced with considerations for the next ten seconds. You let your legs drift apart, the tendril heavily sliding against your parts and deeper into the water, inky black by the sheer number of tentacles you'd filled the tub with. It takes them a bit to notice. Just get comfy and relax... You glanced around the room. No book, no tomestone, no glass of wine. How the fuck were you going to oh whoops As your thoughts descended into idle musing, you felt a slight nudge against the entrance to your vagina. Your heart skipped a beat... Then nothing. An arduous 2 minutes of waiting had passed before you felt something once more. A heavy nudge from a tendril, it's slippery body bouncing off from your lips. It swam back into position, intently nudging it's tip between your lips. As a tiny bulb of it slipped in, the bulb rapidly expanded! It locked itself in place, pulling it's body towards your as... Something happened in the tub. Tendrils surrounded your ankles, gently weighting them down as a rather large mass of them began to swim onto your lap. It feels kinda like a weighted blanket, I guess... You thought to yourself, that crimson tint steadily spreading across your cheeks. You let the thought mull in your head for a moment, before giving an experimental tug with your leg. Two realizations hit you in unison: The tentacles had you in a firm grip, holding you still without applying even an ounce of pressure... And that bulb that had locked you in place had steadily eased itself an ilm deeper inside you. You let out a quick huff, staring down into the hot water at the inky squirming mass of tentacles beneath. Shit, you thought to yourself. You were going to be here a while.

A jolt of pressure coursed through your pelvis as the bulb began to gyrate slightly, easing your walls to acclimate to the size by occasionally expanding the bulb wherever it felt any particularly tense spots. As you began to discern its intentions, the tension in your shoulders began to ease, and you let out a slow exhale. As the weirdness began to dissipate, you sunk a couple ilms deeper in the water; the tentacles, despite their grip on your body, required hardly any effort to shift forward in the tub. As the heat of the water offered an instant respite from the chill in the bathroom, you found yourself pressing your hips toward the bulb. With a hard nip on your bottom lip, you pressed your body toward the bulb with a determined motion!

To say what happened next occurred in the blink of an eye would be an understatement. As you pressed your hips forward, the squishy, slimy bulb pressed tight against your womb, wriggling intently to fill every millimeter of space inside you. In unison with this sudden motion, the tentacles rapidly thrashed about in the water until each clung tight to your lower abdomen and thighs. It felt as though your heart leapt into your chest, and panic rapidly set in! "FUCK!" You yelped, shoving at the tentacles.

Within a moment of your outburst, the tendrils dispersed into the water; It even took you a second to even realize the bulb had been removed.

You blinked, staring at the preternaturally still tentacles under the surface of the water.

"Wait, did you hear me?"

There was a resonant motion throughout the water as the tendrils vibrated in unison.

"You got scared by me yelling? Wait, you can understand me?"

Another resonant vibration, different this time, followed by the same as before.

"Holy shit you are sentient!"

The tendrils vibrated in unison, signaling yes.

"I FUCKING KNEW IT!" You cheered to yourself, triumphantly. With a nod, you spoke again to the tentacles. "If you weren't sentient and able to communicate it would bring up a whole bevy of ethical problems to have you fuck me. You do wanna fuck, right?"

The tendrils signaled yes, in agreement to the ethical conundrum of fucking tentacles that might not know how to communicate. They, however, did. So fuck yeah. The tentacles signaled in affirmation again, slowly pressing themselves against your body as they did before. The tendrils seemed to weigh a lot... Impossibly much for their size.

As you felt that bulb slowly spreading your lips once again, you uttered with a shiver in your voice: "Stop if I say... Mirror." The tentacles vibrated in affirmation, in direct contact with your body. A surge of intense sensation coursed through your muscles, leaving behind a lingering lazy relaxation throughout the muscles subject to the vibrating pulse's onslaught.

The tentacle responsible for the bulb wasted no time in returning to its machinations, once again easing the bulb into and out of your walls, expanding once more whenever it found a place it deemed tense. As it slipped deep again, pressing the slimy bulb against your womb, you felt the tentacles clinging to you squirm and shift. There was a sudden, soft pressure against your ass. Thankfully not a bulb, like the sticky friend who had been acquainting itself with your womb... It was different, an incredibly thin soft point. It seemed to naturally create a slippery coating, and the point of the tendril drew itself down to mere millimeters in width. Despite how tight you considered your opening, the tentacle had slipped past with scarcely any incident... It was actually a pleasantly inoffensive first thrust. Such a respite was not to last, however, as you felt a similar bulb as before slowly expanding inside your ass. You let out a slow exhale, your ears relaxing as you gazed up at the fleeting patterns on the ceiling. Fuck, that was gonna be boring. It'd be nice to have music or something, at least. "H-Hey, you're a bunch of tentacles, right? My tomestone's waterproof, can you send one to go get it. Wait, please don't viiiiiiiii— The sudden shocking surge coursed through your muscles again, cutting through your self restraint and forcing a harsh moan from your lungs. "F-fuck..." You huffed, glancing over at the tentacle that hopped down and slithered off to grab your phone. That's kinda useful... You thought to yourself, your mind suddenly becoming cognizant of the tentacle bulb in your butt pressing intently against your opening. Suddenly, you felt a similar bulb pressing from the other side! A generous slippery coating of the tentacle's goo eased... Or perhaps intensified the stimulation of the bulbs softly squishing against one another. With each press, the tendril joining the two bulbs expanded a miniscule—but noticeable— amount.

"Mfh... Y-You guys are kinda useful, y'know?" There was a tiny vibration, not enough to send the surge through you like before. "If I wanted to keep you all around for an extended period of time, what would I..." Your shockingly long state of commentary-facilitating lucidity from lust was rapidly fading, and you needed to wrap it up quickly before you succumbed to that blissful haze in your mind once more. "W-What do I need to give you to take care of you?" You mumbled, taking a deep breath and letting out a thready whisper. Despite the heat of the water, you felt a sudden harsh chill weigh your body down.

Oh.

That was the catch.

You gently flopped back, smiling to yourself, the bulb still sat pressed against your womb, as the two bulbs in your rear worked diligently to comfortably stretch you. You had a mass of voidsent tentacles in your bathtub—inside you— and they wanted aether. Great. You'll burn that bridge when you come to it, okay?

Your ears perked up, and your hand hovered over the water's surface. You steadily began to channel a stream of energy into the water, and immediately the tendrils took notice. They began to channel a modicum of energy into the stream as well, allowing you to communicate telepathically for a time. In the span of a second, your eyes suddenly went wide at the sheer volume of thoughts the tendrils had in store for you. Just as soon as your concern of pain reached your mind, it was dispelled by the assuaging of the tentacles. It wouldn't hurt.

You nodded.

The stream of energy subsided, and all was still for a moment. Then, as they were wont to do, the tentacles sprung into action at once. Their grip tightened on your body, and the soft bulbs suddenly became firm as stone. "Wh-" You started, wincing as the bulb that pressed against your womb suddenly felt like marble. There was a tiny poke into the entrance of your womb, soft like before. It wriggled slowly, pressing itself thinner until it eased the hair-thin tendril into your uterus. It created a second branch, drawing itself microscopically thin and slipping itself into your womb. There came a third, and a fourth. You stared down at your pelvis, and the squirming muscular mass of tentacles surrounding it, waiting with bated breath.

The hair-like tendrils wasted no time, expanding ever so slightly. You winced, but found one tendril withdrawing instantly before they repeated the motion again. This time, you found the sensation rather unpleasant but bearable. The tendrils began to form another tiny bulb inside your womb, and you let out a yelp at the very unbearable sensation. The tentacle responded in kind by briefly lapsing its form on the bulb. It turned to almost a liquid state, pooling at the bottom of your womb... Yet not a drop could leak out. Instead, you felt the tendrils inside your womb adding to the level of the inky "liquid" in your uterus. The heat was intense, but the pain had subsided and been nearly forgotten, it seemed. From the "liquid," two small tendrils began to take form as they pressed into your fallopian tubes. They eagerly, carefully proceeded inward, taking care not to stretch or disturb the delicate parts within.

As the tendrils set to work inside you, the firmness of the bulbs began to subside. Once more, the squishy tentacle pad pressed itself tight against your cervix. You winced as you felt the bulbs on either side of your anus pressing you open more intently, steadily feeling a wiggle back and forth between them... And then a sudden stretch! The bulbs had merged into one orb almost 2 ilms across, and were keeping you mercilessly stretched. You let out a sharp mewl, your hips squirming as it expanded another half an ilm for ten seconds... And then receded to the prior 2 ilms. That sudden unpleasant increase in size was enough to make 2 ilms perfectly comfortable, at least.

She told you they can be kind of addictive.

The tendrils within your fallopian tubes continued their progress inside, diligently seeking something as they ventured ever inward toward your core. Soon, they—and their twin set in the other side of your body—found the tiny gap into your abdominal cavity... And your ovaries. Two sets of tendrils swiftly set to work, deftly expanding slightly and hovering mere microns over your ovaries. The other six occupied themselves with venturing deeper inside you, seeking to explore everything they could about you. They paused momentarily, two ilms from the fallopian boundary... And each began to expand at their base up to an ilm. They then managed to disconnect themselves, spreading that one ilm bulb into a total of twelve thin long tendrils that wriggled deeper inside your abdomen to explore. The tentacles that were so intently focused on your ovaries seemed to halt. One began to expand, flattening out as it pressed itself against your ovary. It continued to expand, steadily enveloping your ovary in its sticky black ooze. The still tendril expanded at its tip, splitting into a myriad of hair-fine tendrils. It pressed itself against the sticky envelope around your ovary, and began to deftly wriggle within the gooey surface. The hairs sought small nodes on the surface of the ovary, pressing gently but consistently on them until they pierced through into each ovarian follicle. The tiny hair tendrils wriggled inside, seeking the ovum within each follicle. Before long, each had pierced into their respective follicle's ova, replacing your genetic material with the tentacle's spores. Another tendril was intently pressing itself into the ovary itself. It expanded a few microns, splitting off from the main branch and wriggling to the primordial follicles. It quickly wrapped itself around the section containing the undeveloped eggs, and did a brief twirl to excise it with nanosurgical precision. Its movements didn't make cuts, they parted cells from one another with no pain. The tip of the tendril darted forth from the surface of your ovary, making another small set of incisions. It swiftly pressed the primordial follicles into the surface coating your ovary, before pulling the cells back together to form an instant bond. With your most dormant of eggs gone, it expanded into a small bead and began to merge into the absent section. Within seconds, it had already saturated its slimy coating with spores and absorbed the aether from the doomed ova.

In one fell swoop, it rendered you infertile... Yet, remarkably fertile. Gone were the days of worrying about raising someone's demon spawn for eighteen years. Your partner's cum would supply the spores with the nutrients they needed to grow, and you would give birth to a clutch of beautiful ink-black tentacles a few days later... And you knew the whole time.

It told you, it asked if it could, and you permitted it.

The slime coating your ovaries began to slowly take hold, binding itself to the surface and forming a few slimy strands. It steadily guided the strands to your abdominal walls, your uterus, intestines, and kidneys... And began to coat them in that similar ooze wherever it could do so. As the slick coating covered your insides, two of the tendrils from either respective fallopian tube began to braid into one another. The merging tendrils began to expand, slowly forming into a rather large tentacle node that clung firmly to your uterus. It slowly spread two tendrils outward, down to your ovaries, and slipped them into the gooey membrane surrounding your ovaries. Without breaching a single cell wall, it could influence the hormones your ovaries produced. The nodule tentacle set to work in an instant changing your blood chemistry ever so slightly. It could increase your lust, augment your adrenal capabilities, increase your lust, or increase your lust... And it did so rather readily. A hot haze swirled into your head as the tendrils began to merge themselves into one inside you, distributing themselves evenly throughout your core to avoid disturbing you. The smaller tendrils, busy with exploring your body, were elated to encounter the thin slippery coating throughout your abdomen. They could move with impunity, neither harming nor distracting you while they satisfied their myriad curiosities. As the squishy bulb pressed against your womb retracted, it drew the tendril linking it and the clutch within your core taut... And snipped it. The bulb expanded slightly, giving a sudden jostling tug of the nodule down against your G-spot.

You let out a sudden mewl as you felt the intense pressure surge into pleasure, frantically grabbing your phone to find some kind of music to listen to. You set it to your favorite music for this setting, and winced as you felt the "fluid" tentacle within your womb wriggling frantically... It was starting to tickle, gods damn it. Within your womb, the fluid had begun to coalesce into a clutch of twenty or so tiny tendrils. They wriggled and squirmed, eagerly seeking an exit they weren't strong enough to take yet. Damn it... They probably need cum, don't they...

Despite this minutiae of detail on the machinations of the tendrils in your vagina, the others never ceased their diligent work. The two bulbs that had only a minute ago spread your ass to two ilms in diameter began to slowly work their way inside your butt. As they formed into one, they began to gently expand inside you. You bit your lip, stifling a little chirp of stimulation as the bulb pressed into the depths of your ass, maintaining its thickness as it pressed deeper. Despite the strange twitching sensations in your abdomen, the thick tentacle that was steadily writhing deeper into you was firmly at the forefront of stimulation. You could feel the tentacle change inside you, the head of it turning into a nodule with a hundred tiny soft feeler tentacles. With that extra bit of sensory reception, it paused for a second... And then very efficiently squirmed deeper into your butt. It had no qualms about coating the insides of your intestines with its ink-tinted slime, and demonstrated that quite readily as it continued upward inside you; it rounded the corner inside you, which sowed the seeds of a thought that filled you with a bit of dread... You were quite at its mercy now; a submissive for a sentient gestalt of tentacles.

You wanted more.

A brief flash of information surged into your mind, ideas and options it afforded you. One seemed like it could be fun. You permitted it. Within seconds, the squirming mass of tendrils had parted its ways of the front of your body, leaving your neatly trimmed mound, clit, and urethra exposed to the water for the first time in hours. Such a reveal was short-lived, however, as a group of tentacles slithered their way into covering those adorable exposed spots. Your fingers dipped into the water, running along the shaft of one of the tentacles. You brought that selfsame finger to your lips, giving the tentacles' slime an experimental taste. So that's what she meant by addictive...

"S-So, if you do this, my pee will taste like this?" There was an affirmative vibration in the water.

Your cheeks flushed a shade redder, and you nodded. This set of tentacles seemed easygoing and lazy, and slowly drifted their tendrils along your pubic mound. Occasionally, the tendrils would stop and brush through your soft downy pubic feathers, studiously noting their presence... And maybe giving you a little bit of scritches. One tendril in particular finally found its object of interest: The tiny hole half an ilm or so under your clit. It prodded at the hole, a tiny tendril only a quarter ilm across curiously delving into your urethra. You took a deep breath, leaning back in the tub. This was at least a familiar sensation, and didn't hurt a bit. You felt your hips lift slightly as the tendril squirmed deeper into you, the slime lubricating it well but not enough that it could thrust into you without lifting your body a bit. Finally, the tip of the tendril poked into your bladder. It slipped an ilm deeper, the tip splitting open. As comfortably as it could, it carefully lined up all ten of its eggs and began to slowly but steadily work them inside. As they slowly protruded from the tendril's tip into the clear liquid inside your bladder, they slowly maintained their neutral buoyancy. The eggs began to expand as they came into contact with the fluid, rather uncomfortably so. With all ten eggs inside your bladder, they had expanded to a rather agonizingly large state: It felt as though you desperately wished to pee, but could not do so. You squirmed and writhed in the tentacles' tight grip, but the sensation of your body making way for the tentacles as you moved instead of the opposite holding true stopped you instantly. The eggs were steadily changing, seeming to grow into their coiled up tendril form in seconds as the water was absorbed into the eggs. Finally, the clutch of tendril eggs in your bladder hatched. The happy little tentacles wriggled around inside you, tickling the walls of your bladder... But more than anything, it seemed the sensation of the liquid inside it had changed. You could feel a viscosity you were unfamiliar with, and a small turbulence to it. The tendril that implanted the eggs in you pressed deeper inside you, one at a time. You winced, biting hard on your tongue as a wave of intense discomfort struck you. The tendril had implanted two small tendrils into the ducts to your kidneys. Those two could use the excess nutrients your kidneys removed, and create the slimy liquid the tentacles were well known for. As the tentacle in your urethra retreated, you couldn't help give in and allow your bladder free. A deep crimson shade spread across your cheeks as you felt the nectar flow free from your body. It feels identical to precum... You thought, staring at the wispy inky pattern formed in the water as you felt that relaxation sink into your body... Right until you felt those tendrils squirming in your now empty bladder.

To call the sensation unique was an understatement. It tickled, you found it stimulating, you found it terrifying, and you found it... Right? Fun, was a better word. The sensation inside you was curious, perhaps. As you sat there, staring in vain at flesh you couldn't see through, you couldn't help but smirk, winking at the next reader of this story... And savoring the fact that they have to wait with bated breath to read the rest~ ♥