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The interior of this section of Maruki’s Palace was all pristine white tiles and bright overhead lamps. A lab through and through, the environment was unsettling. No windows, sparse decorations, and some shelving. Odd, for a place that supposedly is the center of Maruki’s mission to save the world, but you had grown used to it.
You had absolute trust in Maruki.
Laying on your back on a white table, naked with no privacy, most people would at least be nervous. Especially considering what Maruki had planned for you. But you were relaxed. You laid your head on the pillow and relaxed every muscle, the tension leaving your body.
“ Experiment number one,” He announced over the intercom. He wasn't present in the room but you knew he could see you through the numerous cameras surrounding you on the upper wall, moving on the end of prehensile tendrils to get in the proper position. He needed to see you at every angle and document every change.
That, and he'd probably jerk off to the images and videos of you like this later.
“ How do you feel right now, Y/N?” He asked, sounding concerned yet clinical. He cared about you, but he was a dedicated researcher.
“Fine. Calm,” You replied, eyes darting from camera to camera. Which one was he looking through?
“ Excellent. Are you ready to begin? Remember, we can abort the experiment at any point. Your comfort is a priority.”
You took a deep breath. No, you needed this. He needed this. To further his research and save the world, he needed a live, human test subject, and they needed to be someone he trusted. Only you could do this.
“I'm ready.”
It began with a soft sound of flesh scraping against the tile floor. Azathoth's tentacles emerged from unseen holes in the floor, slithering around the table and onto your bare skin. You shuddered as two tentacles latched onto your breasts, placing a sucker-like orifice over each nipple. As you arched your back at the new sensation, another tentacle slid up your leg, wrapping around your left thigh once before slipping between your vaginal lips, the slick surface pushing in without much resistance.
“ Status?”
His words hardly registered in your brain through the haze of arousal, your receptors bombarded by the suckers on your chest and the tentacle sliding in and out of you.
When you finally processed his words, you replied softly, “Good. I feel good.”
“ How so?”
“Relaxed, and… aroused,” You admitted shyly, though you didn't know why you were hesitating. You were naked in a room full of cameras with his persona groping you. What was he thinking at that moment? Was he aroused, too? Or could he stay calm and clinical even with the erotic image of you splayed out on the table being railed by tentacles?
“ Good, good,” He paused, presumably to make notes, “ Then I have your permission to proceed further?”
“Yes.”
The tentacles twitched as though they were delighted. It was a strange thought, but you had no idea if Azathoth got any satisfaction out of this or if he was merely doing as Maruki wished. Either way, you relaxed as a flood of euphoric sensations washed over you, pumped directly into you through the tentacles.
Things were only just beginning.
“ Initiating phase one.”
The tentacles on your breasts swelled thicker, and with it, a flash of rainbow colors crossed your vision; a sign of his power shifting reality drastically. In the blink of an eye, you were wearing a tight black latex bodysuit covering everything except your head, with holes for your breasts and genitals, through which the tentacles kept working, the tight material sometimes squeaking as the tentacles moved against it.
“ Perfect,” He purred, his voice a little breathy. Was he jerking off already? Were cracks already forming in his calm, collected professionalism? “ How does it feel, Y/N? Not too tight, I hope.”
“Fits perfectly,” You answered honestly. It was as though it had been tailored for your body with meticulous attention to detail. You knew better, though. Maruki was growing more powerful, and this test proved it. To create a perfectly fitting garment with little more than a flash of his power without prior knowledge of your measurements had you stunned.
A moan slipped from your lips as the appendage in your vagina changed up its thrusts, pushing right into your G-spot with forceful care.
“M-Maruki,” You cried out. He hummed with what you could tell was arousal—definitely masturbating.
“ Sorry,” He took a deep breath, “ Ready for the next test, then? This one's not going to be as easy as the first.”
“Always,” You breathed. The tentacle undulating within you stopped in preparation for what was to come. The rainbow kaleidoscope pattern flashed over your eyes again.
Three more tentacles emerged from underneath the table, two thin ones taking hold of each arm while a thick, blunt-headed one slipped in a hole in your suit and prodded your ass. Your eyes bulged from their sockets as the thick tendril forced its way in, and by Maruki’s ability to bend reality, it went in without much pain, just a little of an unpleasant sensation and nothing more.
“ Perfect,” He moaned, no longer trying to disguise his lecherous intentions. “ You're taking it so well, Y/N. Such a good girl for me.” He cleared his throat, attempting to sound professional again, “ How does it feel now?”
“Incredible,” You panted, your hips jolting with the synchronized thrusts of the tentacles in your ass and pussy while the two sucking on your tits thrashed, stretching your tight bodysuit further.
“ How much more do you think you can take?” He asked, his heavy breathing crackling on the speaker, “ And don't be afraid to stop. I don't want to break you.”
“I can take it all,” You mewled, “Now please, keep going.”
His breathing stuttered, and a few seconds passed before his response. “ Okay. Initiating phase two. Remember to tell me if it gets to be too much.”
Reality changed yet again. Not only did six more tentacles emerge from beneath the table, but several more cameras appeared. Maruki wanted even more angles of you being debauched by Azathoth's tendrils.
As a second tentacle joined the one already in your pussy, two tendrils with phallic ends slid into your hands, undulating in time with the ones inside you. One more, skinnier than all the others, snaked up your neck and touched your lips softly, as though asking permission. You parted your lips eagerly and moaned as you suckled it.
His soft moan echoed in the intercom. He probably forgot to turn off his mic. Could you blame him for giving in to his urges? The tentacles were all over you, wrapped around every limb, the extras that weren’t using you slithering up and down your body, almost caressing you, in a way, leaving slimy wet trails while the others almost eagerly fucked you. The two fucking your hands wrapped the extra length of the tentacles around your wrists, using it to control your hands as the phallic ends fucked them. The one in your mouth began undulating, secreting a thick, sweet liquid, not unlike honey in its taste.
“Ahh, apologies. I forgot to announce the initiation of phase three. Tastes good, no? It’s an aphrodisiac, among other things.”
You nodded, suckling eagerly. Down low, you were producing enough slickness that the two tentacles in your vagina were making lewd wet noises with each movement. The slick was spattered on your thighs and the cold metal of the table, making them sticky. The ones in your hand squirted a translucent white fluid, splattering it over your bare chest and on your chin, and that was the last straw. Your cunt convulsed around the tentacles as you squealed around the currently gagging your mouth.
“Beautiful. Covered in cum and sweat… You’ve never looked more beautiful than when you’re debauched.”
The rainbows shifted across your vision, and a door appeared across the room that wasn’t there before, made of metal, and opened with a soft whoosh. Maruki entered, dressed in his usual shiny white suit, hair slicked back. Other than a very prominent boner, he looked as collected as ever. He approached with rhythmically timed steps.
“Y/N,” With a wave of his hand, the cameras backed off, some disappearing while others vanished entirely. He was here not just as an observer, but as a participant, now. His hand traced from your breasts, enveloped by the suckers, up your neck and to the bottom of your jaw. Your throat muscles moved as you swallowed a few more drops of the thick fluid before the tentacle retreated from your mouth, freeing you to speak though you didn’t know what to say.
“How does it feel?”
“G-good.” An understatement, but you were too numb to think of another response. Your pussy twitched weakly around the tentacles down low as they quickened their advances.
“I want to make you feel more than good, Y/N,” He replied, eyes noticeably darkening beneath his glasses, “I want you to experience bliss. I want you to want nothing more than to be here, with just myself and Azathoth. No thoughts in your head,” He lowered his voice to a seductive whisper, “Only pleasure.”
He unzipped, whipping out his cock and urging it toward your hand. One of the tentacles retreated and allowed you to take hold, your hand already slick with the tentacle’s slime. Your cunt throbbed with pleasure as you stroked his rock-hard member, watching as precum slipped out of the slit.
“Oh baby,” He moaned, “You were born for this. You’re good at this… Perfect for my experiment.” He slid his cock from your hand and made a waving gesture to the tentacles. They shifted your body so that you were laying sideways on the table, your wet pussy spread wide with the two tentacles pressed deep inside it. Maruki lined his cock up with you, and rather than pull out, the two tentacles wrapped themselves in twin spirals around his cock. “Take me. Take us .” He pressed his cock inside you.
You mewled and threw your head back in pleasure as his thick cock and the tentacles penetrated you, stretching you nearly to your limit, but Maruki would never let anything in his reality hurt you. Your body stretched without pain to accommodate his cock and the thick, pulsing tendrils surrounding it, gripping him to give extra pleasure.
“Oh yes, Maruki.”
“Hush,” He put a finger to his lips, and on cue, a tendril slid inside your mouth, its honey-like slick relaxing you and causing your arousal to flare up deep in your loins. You felt like you were on the edge of an orgasm yet again from hardly anything. “You’re mine, Y/N.”
Rainbows shifted across your vision yet again, and with it, a dozen more tentacles emerged from the floor. They slipped into your latex dress, shredding it as they slid all around your body. The one gagging you slid deep into your throat, and you choked on it while the others bound you completely, leaving you just a small margin to move, but you were helpless to do anything but be used and fucked by Maruki and Azathoth’s tentacles.
“You’re mine,” He growled, increasing his thrusts as a tentacle caressed his thigh, “All mine.”
You hummed in agreement, drinking more of the aphrodisiac substance while the two phallic tentacles fucked your hands and another slid up between your breasts, which were still attached to the suction cup-tipped tentacles.
In a much more aggressive, possessive tone than usual, Maruki growled, “How does it feel to be reduced to this, Y/N? To have every part of your body used?”
You could only moan in assent with the tentacle still gagging your mouth, but he voiced his pleasure with your response loudly with a long groan. His hands seized your wrists, more as a symbol of his control over you than to restrain you. Azathoth had every other part of your body restrained.
“All…mine…” He closed his eyes in ecstasy. His hair was a mess, sticking up in places, while his perfect white suit was wrinkled from the vigorous exercise. “I’m going to… get you pregnant, Y/N. You’re the only one I want to have my babies. The only one fit to be used like this…”
His words drove you over the edge once again. The Earth seemed to freeze on its axis as everything stopped at the peak of your pleasure, the powerful orgasm sending a ripple through your body down to your very soul. Your cunt squeezed tightly around Maruki and the tentacles, at last pushing him over the edge as well, shooting a wealth of his seed deep inside of you.
“Yes! Yes… Y/N…” He buried himself to the deepest point and pressed his body against yours as his balls throbbed and he emptied the last of his spend inside. “Perfect… You’re perfect… Get pregnant.”
You relaxed. Slowly, Azathoth’s tentacles shrank and slithered away to wherever they had come from, leaving your body naked and covered in slime, sweat, and arousal. While you relaxed, exhausted and nearly falling asleep, Maruki lifted you in his arms. He had been a mess a moment ago but was now perfectly dressed and groomed again.
“Would you say this experiment’s been a success?” He asked half-jokingly.
“I hope so,” You replied, voice hoarse and throat dry from the vigorous fucking of your throat, “I wanna have your babies. I want to serve you in any way I can. You’re saving the world, after all.”
He hummed in agreement as he carried you to the elevator. The Phantom Thieves would be a problem in his future soon; he could already sense them prowling around the lower reaches of his Palace. Ah, but that would be a problem for another day. Right now, he had you to take care of, and he was happy to do so as you fell asleep in his arms on the elevator ride.
Your help in testing the prehensile and shape-changing abilities of Azathoth’s tentacles had done wonders, even if you didn’t realize it. The lewd alternate purpose of the experiment was for your pleasure and his, but this was, overall, an experiment, and he would come to call it a success.