Chapter 4 of Vault 62: New Discoveries

Chapter 4 of Vault 62: New Discoveries

Chapter 4 is here!

This chapter includes: femdom on female, huge penis, absurd body proportions, tons of cum, cum inflation, and pregnancy/extreme pregnancy. You'll also find Fallout and Bethesda references and more.

Tags are for the entire story.

Feel free to leave comments and suggestions!

Enjoy your reading :)

Another week went by.

Imogene nervously stood in a room designed for artificial insemination. The bright lights above her illuminated the cold, sterile surroundings. There weren't many decorations since the room had been repurposed to accommodate a different type of experiment. At the center of the room stood a long examination table, the walls lined with gray steel countertops and wooden cabinets, a few medical posters scattered about. Most of the actual medical equipment had been moved to storage, no longer needed for this new purpose.

After hours of sexual fun and a shower for both, Imogene and Bridget had discussed what needed to happen. They met again in the Overseer's office, where Imogene's semen-covered belongings had been replaced and the evidence of their raunchy activities had been more or less removed. Bridget took a pregnancy test--the vault boasting thousands of them--and confirmed that she was, in fact, pregnant. They'd succeeded.

Their conversation about how to move forward was brief but urgent. Bridget informed Imogene that she couldn't impregnate every woman in Vault 62 right away: one more obstacle needed to be overcome first. Their conversation focused on her namesake, 'Mei Nakamura', the vault's Head of Security. Imogene had to convince Mei to join their team.

Bridget also explained that Mei wouldn't allow the lewd activities to continue without experiencing it herself. The Overseer already had a plan: Imogene would tell Mei that the vault's Cryo Sperm Bank had failed due to a power breakdown, but that Vault-Tec had provided a backup in case of such an event. Imogene was that backup! Yes, Bridget mentioned, her head of security had been informed that Vault-Tec had intentionally included a futanari amongst the residents, with Imogene's job being to provide the semen needed for artificial insemination if the service went down--which was their current situation.

Imogene agreed to the plan without protest. She was looking forward to seducing Mei anyway.

And there she stood, anxiously waiting in one of the coldest areas of Vault 62, her suit not providing enough warmth to make the low-degree temperature comfortable. Imogene had no idea what would happen in her meeting with Mei, but she was prepared to seduce the Asian woman if that's what it took. She had kept herself presentable, hiding her balls and penis from view, her secret still safe with only Bridget knowing her true nature.

Her mind raced as she waited. Where was Mei? Bridget had given Imogene a room and a time to meet her head of security, and she had arrived early. She expected Mei to be there by now. Pacing back and forth, Imogene checked her watch, staring at the seconds ticking away. She'd be late if she didn't show up soon.

The door opened.

Imogene snapped to attention, standing upright as Mei marched in and quietly closed the door behind her. The head of security looked the same as always, with her sharp features stiff, short hair feathered, and a perfectly toned figure enclosed in her jumpsuit. Imogene noticed that Mei had her pistol holstered on her belt, along with a walkie-talkie and her keycard. She didn't say a word, her arms crossed over her small chest.

Peace reigned in the room. No one talked, just stared at each other, piercing glances boring into each other. Mei ran her eyes over the futanari woman, focusing on her crotch for a while, her eyes narrowing. Imogene tried to shake off the unsettling atmosphere that surrounded the woman, standing firm, her expression just as cold as Mei's. After several tense minutes, the Security Head stepped back, let go of her crossed arms, and sighed. Had she made some kind of decision?

"So Dr. Walsh wasn't lying to me," Mei said in her resonant voice, looking straight at Imogene, "you really were sent by Vault-Tec in case the Cryo Sperm Vault malfunctioned. You are a futanari? Right, Ms. Smith?"

Imogene nodded.

"Yes to both. My given name, however, isn't 'Jane Smith' - it was just an alias. I'm Imogene. Vault-Tec hired me to guarantee the experiment of Vault 62 would run smoothly if something went... well, wrong with the Cryo Sperm Bank - discreetly, needless to say. You know how the company is."

She hoped her explanation sounded official, and when Mei nodded in response, she knew she hadn't ruined her cover.

"I do. And so I'm to be impregnated now? It seems odd to have the Head of Security be one of the initial ones to undergo this - it might compromise the vault's security."

"I... I understand your hesitance about being among the first to go through insemination," Imogene started, picking her words carefully, "but it was in Vault-Tec's plans from the beginning, the plan initiated by Dr. Walsh herself. She wants to set a good example for the occupants and employees, and hopes that having herself and you, the Head of Security, among the first to be impregnated will help guarantee the experiment is a success."

"I see."

That was all Mei Nakamura replied with, causing Imogene to gulp.

"So let's get this done then. The sooner it's over, the better. I'll start undressing now."

Imogene was caught off guard by how plainly Mei spoke. Her eyes widened as the fit woman pulled down the zipper on her vault-suit from behind her neck, unsure if she should do the same. Mei remained oblivious to Imogene's dilemma, none of her features showing any embarrassment as she exposed herself to the futanari. Imogene struggled not to overtly stare at Mei, still overwhelmed by her curiosity and excitement.

Mei's complexion was paler than hers or Bridget's due to her heritage and the absence of sunlight in the vault for nearly a month. Her shoulders were wide and sturdy. Her chest was small, her breasts barely noticeable, topped by even tinier brown nipples and their matching lightly-pigmented areola - though Imogene couldn't help but respond to them! Her arms were muscular, Mei's muscles bulging with visible brawn. She slid down the jumpsuit.

Her stomach wasn't flat but rather defined, thanks to a set of powerful abs, Mei sporting a six-pack that protruded with every intake of breath. Imogene discovered her hips were surprisingly wide, evidently unnoticed when she watched her walk around the vault. She was taken aback by the neatness of Mei's pubic hair, her midnight-black pubes forming a narrow strip that rose to her lean midsection. Thick, muscular thighs framed her crotch, and her pussy seemed minuscule given Mei's stance.

When Mei stopped undressing, she reached into her vault-suit, pulled out something, and extended it towards Imogene.

"Here," Mei presented the object to Imogene, waiting until she'd taken it before she set her jumpsuit down on the counter, "you can use this."

Imogene turned the object in her hands, puzzling over it, unaware of why she had been given lube.

"Lube?" Imogene inquired, glancing at Mei, "Why do I need this? I thought we'd do some foreplay before-"

Mei shook her head.

"No. No foreplay. I want this to be over with as soon as possible - I'm not here for amusement. The lubrication should be enough."

Mei turned her back to the futanari, bending over the exam table and clenching its sides, exhibiting herself to Imogene even more by parting her legs.

"You may commence whenever you're ready."

"Hey, wait a minute! What about me? I'm not, you know, ready yet, and I can't do this until I am!"

"That's not my problem. Just hurry up with whatever it is you need to do!"

Imogene looked at Mei with a grudge, realizing that there was no chance for a rational discussion. She put down the bottle of lubricant and started taking off her clothes, casually tossing her jumpsuit away. Her cock and balls were completely limp, resting against her thighs and looking like lifeless appendages due to the chilly air. Imogene grabbed her dick and began stroking it, trying to bring it back to life, unsure of how long it would take to achieve a full erection.

She then turned her attention to Mei. Now that she could clearly see Mei's little slit, Imogene noticed just how incredibly tiny it was! It had been the smallest one she had ever seen, little more than a thin line without any distinctive features at all. Looking at Mei's rear end for the first time, Imogene was amazed by how fat it was too; it was probably bigger than Bridget's! A pair of huge globes stared back at her, protruding from Mei's waist on both sides, while loosely rolling around her back. How could she have missed that? Mei's cheeks were so big that Imogene was convinced they could easily fit her whole head inside! They were just as firm, thanks to Mei's outstanding fitness level. They hardly jiggled or shook at all, not even when she adjusted her stance!

Feeling even more turned on, Imogene picked up the bottle of lubricant and drenched her dick in it, shivering from the freezing cold of the liquid. After lubing herself up, she approached Mei and decided on a plan of action. Mei was going to help her reach a full erection whether she wanted to or not, and Imogene knew the perfect way to make it happen. Finished lubricating her member, Imogene also applied some of the fluid to Mei's little slit, rubbing it with her finger, but even a single digit struggled to enter her folds. My god, she was so tight!

Mei didn't react to the stimulation in the slightest.

"Alright, Ms. Nakamura," Imogene began her insemination process, standing behind her, "I'm, uh, I'm starting now. Is that fine with you?"

"Finally." Imogene heard a subtle eye-roll in Mei's voice, feeling her teeth grind from the mental image. "Hurry up, I've got some important things to do."

Imogene tightened her fists before relaxing and, with gritted teeth, continued. Grabbing a hold of one of Mei's hips, she lined up her soft cock with the woman's incredibly small sex. She rubbed her dickhead against Mei's entrance, searching for any weakness, hoping to find a spot that would let her actually make progress. What was she meant to do under these conditions?

Several minutes later, Mei's pussy finally started to give in, despite her stiff immobility. Her face remained expressionless as Imogene managed to push just the tip of her penis inside. Frustrated by the lack of response, Imogene wanted nothing more than to grab Mei's hair, but she knew she would have to wait until she showed any emotion at all. She struggled to penetrate Mei further, the lubricant having very little effect on the situation. After a while, she managed to fit just her cockhead inside, fighting against the strong resistance coming from Mei's tight slit. But she wasn't going to give up.

Imogene was on the verge of giving up entirely when she noticed the smallest signs of success emerging. Mei's lower lips started to give under the immense pressure applied to them, folding inward before they peeled back, blossoming, revealing the pink folds of her vagina; Imogene hardly paid any attention to how pretty her vagina was, so focused that if a bomb had gone off next to her, she wouldn't have looked away. Emboldened, she squeezed her shaft so roughly it hurt her, and slammed her hips forward, putting everything she had on this one motion.

It worked!

"Fucking finally..." Imogene murmured, exhaling a breath, "I can't believe she's so tight!"

Mei's back arched the moment she was penetrated - though she still didn't utter a word.

"You all right, Ms. Nakamura?"

"I'm fine... Continue."

Imogene would eventually break her resolve!

It took a moment for Imogene to continue, relishing in her accomplishment while simultaneously marveling at how snug Mei's vagina felt. There was almost no carnal pleasure gained from the act, just a noticeable amount of pain. Face scrunched up as she tried to make sense of the vice-like grip Mei's vagina had on her member, Imogene began to pivot her hips towards the woman, trying to stretch her hole and make it more accommodating for the size of her tool; it was almost as difficult to get her shaft inside of Mei!

But she gained some momentum, her wobbling dick cramming its way into Mei's pussy; if her member wasn't so dense even while flaccid, this whole thing really would've been impossible! And her cock was getting harder, slowly filling out, though not anywhere near its true monstrous size - something Imogene hoped would catch the vault's Head of Security by surprise. She still didn't take her hand off her shaft, needing to hold it as steady as possible lest it end up forced out of Mei's pussy from its extreme tightness. That was the real worst-case scenario!

As slow-going as it was, Imogene had managed to get half of her fat length into Mei after many minutes had passed, stretching her vagina out more than it probably ever had previously. Imogene's constant thrusts were well-paced, working as much of her cock into Mei as possible before getting serious, as well as trying to get as erect as she could at the same time. The Asian woman never made a sound throughout all of this, never twitched or squirmed, never clenched harder around Imogene's girth - it was like she was fucking a sex doll! But that would change. She'd have Mei moaning and cumming around her colossal before they were finished, that was a promise!

Fucking the fit woman started to feel good after some time, Imogene reluctantly admitted. There was still a persistently present ache in her member that wouldn't go away, but it was soon joined by pleasure, Mei's vagina conforming around her cock; Imogene wouldn't even claim she had gaped her yet, but she was getting there! She didn't allow herself any vocal-indication that she was enjoying the act either, attempting to remain as reserved as Mei acted, her lips sealed. Imogene wasn't going to fold until Mei did.

At about the two-thirds point of her not even half-hard cock entering Mei, Imogene hit a barrier: the woman's cervix, as she'd recently learned from Bridget. Now this would be the real test! Imogene realized that in her current state of relative flaccidity, there was no way she'd be able to burst through it like she normally would - she'd need to be a good deal more erect before that had any chance of happening! So she'd just have to fuck Mei until then, and show her that being impregnated was the most important thing she could be doing!

Fuck, she couldn't wait.

Smiling at Mei, Imogene lightly slapped her ass, provoking her further. Mei shook her head and turned away. Gradually getting into the raunchy scene, Imogene moved her hips faster into her partner's, causing her large, pale buttocks to jiggle, her gaze fixated on where their genitals were intertwined; more of Mei's pussy was now exposed, her lower lips puffing out slightly, filling like every other pussy Imogene had penetrated. There was still no liquid leaking from her slit, nothing to suggest she was feeling the slightest bit of arousal - but that wouldn't last forever!

As she fucked the heavy woman, Imogene's cockhead repeatedly rammed into Mei's cervix, weakening the spongy wall. Imogene could feel it starting to crumple under her unrelenting thrusting, especially as her member stiffened, Imogene having to back away from Mei to maintain her rhythm. Her monstrous member was still a long way from releasing its full potential, but it had almost doubled in size since she had first pushed it into Mei's petite pussy; Imogene expected that once she entered the Head of Security's womb her member would grow significantly larger.

Her member began to force its way through Mei's cervix. It didn't shatter it like it had with Bridget, but her glans was making progress, delving into Mei's most intimate depths. Imogene could feel her unwilling partner's body stiffen as her swollen glans nudged into her womb, freezing her up from what must have been a completely new experience, causing Imogene's frenzied humping to quicken, her hips writhing like she was about to cum! Just a little more and...

There it was!

"Yes!" Imogene grunted, pressing herself against Mei, their stomachs touching, "Took you long enough..."

Mei gasped along with Imogene, turning her head to glance back at Imogene, her deep-brown eyes open in shock.

"What was that?" She stammered, her determination faltering, "What did you just do to me!? Explain yourself!"

Imogene smiled.

"I've breached your cervix, so I'm now in your uterus, Ms. Nakamura."

"Is that... is that safe? Is it normal?"

"Yup! It's a usual part of the process. This happened with Dr. Walsh as well - you can ask her if you don't believe me. But that'll have to wait till later! First I need to finish getting hard so I can impregnate you!"

Mei frowned.

"What do you mean? You're not hard? How is that possible?"

"No, that would've taken too long, and since you're so busy, I decided to start while I was limp.

"But..." Mei stared at Imogene in disbelief, "but you feel so big! You must be lying to me!"

Imogene stifled a chuckle.

"Not at all. Let's just say that Vault-Tec chose me because I'm 'well-endowed' - more than any other person you've ever met, I'm sure."

Eyes narrowing, Mei swallowed hard and nodded, looking away.

"You may proceed, then."

"Oh I'll be. I'm about to get serious, Ms. Nakamura!"

Although she said this with confidence, Imogene did not instantly rush into action. Instead, she remained where she was - on top of Mei - relishing in the woman's tightness - a tightness that was beginning to relax due to the strain imposed by Imogene's destructive dick. Her inner-walls and uterus covered Imogene's large, veiny goliath, Mei's baby-chamber pushing against her breasts; although Imogene couldn't see it, she knew that the chubby guard must have felt distressed by the bulge that had to be pushing against her chest.

Pulling back, Imogene withdrew about half of her partially-erect member from Mei's squeezing folds, Mei's labia gripping her shaft like a second skin. Shoving it back in, Imogene started to rhythmically thrust herself against Mei, her flat stomach hitting Mei's plump ass, causing her to speed up more quickly than she'd planned - not that she disliked the additional leverage, she took pleasure in the feeling of her ass slapping into her. Imogene let herself moan softly, caring nothing about what Mei thought of her anymore.

As her member enlarged, so did Mei's private area. Up until then, Imogene's sac had remained dormant, but now it began to vibrate, awakening, and her hefty orbs quivered against her thighs. This was preceded by the first drops of pre-cum seeping from Imogene's urethra, pouring into Mei's uterus. Imogene could certainly feel the impact of her powerful, bottled-up lust now, her body warming up, the coldness of the surrounding air no longer affecting her. Her phallus expanded, her testicles sank somewhat lower, and a powerful pulse coursed through her. She was fully immersed in the moment!

And Mei was experiencing it too.

Mei Nakamura had never been one for love affairs. She had attempted dating during university and a few times afterward, yes, but they always fizzled out after just a few short months. Much of it was due to her career-oriented mindset, finding little joy in the activities that a typical relationship entailed; when she'd completed college, her dating options further narrowed because most individuals perceived her with distrust, and those who didn't were like her: "unwanted."

She couldn't bring herself to be with men of Asian descent, no matter their race. Mei had worked very hard to rise in her chosen field, climbing the ladder from a guard at a Vault-Tec office to being personally handpicked for the role of Head of Security at Vault 62; if she were to engage in a relationship with someone of similar ethnicity while maintaining the appearance of an upstanding citizen, it would only make matters more challenging, to her dismay. Additionally, the higher she climbed in her career, the less time she had for such matters, her work ethic taking precedence.

So, although Mei had never been a virgin, her sexual experience had been quite limited. After her first encounter with a college guy, she couldn't even remember his name, she found sex to be... tedious, the act failing to provide excitement or pleasure worth her busy schedule. She slept with other men from time to time - more out of a sense of responsibility than anything - but the outcomes were always the same: dissatisfaction. This was why Mei rarely thought of marriage or starting a family, assuming it could all wait until the war ended.

That was until now.

Despite her initial resistance, Mei had to acknowledge that sex with Imogene was a great deal more thrilling than it'd ever been with a man. The futanari employed by Vault-Tec was gifted in ways she'd never thought imaginable, and her formidable appendage was evoking feelings in her that she'd never expected: it was making her feel good. Though there was undeniable pain - something she could handle without a doubt - the agony of her canal and womb being ravaged was accompanied by an enormous quantity of ecstasy unlike anything she'd ever experienced before.

Mei focused on this pleasure as her body swayed back and forth under the fervor of Imogene's thrusts, concentrating on the exhilarating sensations flowing through her; she tried to resist the desire she'd initially resisted when Imogene had managed to push her knob into her, discovering that even Imogene's "rough" approach sent shivers down her spine. She could feel Imogene's phallus increasing in size within her, expanding her passages and simultaneously penetrating her skin, the blonde resident's organ seeming to be endless in its growth.

Clenching her teeth together, her fingers burrowing into her palm, Mei resisted reacting to Imogene - but her efforts would become a futile endeavor. Bowing her head down, she pressed it against the cold, fake leather of the examination table, and upon doing so, she noticed the deformation in her flesh! Mei gasped louder than she had when Imogene had penetrated her womb, in disbelief at what she was observing; she'd certainly felt Imogene's cock traveling within her, but being able to see it was on an entirely different level of shocking - shocking and arousing.

Just like Bridget, Mei was in awe as her body was altered. Her delicate pale skin was distorted by the size of the huge penis ramming her reproductive system. More than how filled she felt from Imogene's, the sight burned into her eyes triggered happiness rippling through her, emotions she could no longer deny - from the grinding of the futa's marbled veins against her sensitive inner walls to the wide-open vulva, it all sent Mei into a fit of climax. In short, she was having her first orgasm of her life!

A feminine cry erupted from her lips. Mei's head lifted, her back arching, and her fingers dug into the exam table's surface. Unknown to the two participants, Mei's clit appeared, red and swollen, protruding from its hood, throbbing against the underside of Imogene's penis. Her eyes rolled wildly in their sockets, Mei was incapacitated by pleasure, locked in place as she came; her cunt contracted around the futa's colossus, a singular gush of liquid jetting out of it and splattering the floor, along with Imogene's legs and balls, soaking them in its warmth.

Imogene was stunned to discover Mei had never had an orgasm.

"You don't know?"

Imogene couldn't believe it; this was an orgasm! And it was the start of many Mei would experience today!

Mei shivered, her body trembling intensely.

Now that she had the Head of Security under her control, Imogene reached out and grasped a chunk of Mei's short black hair, gripping her scalp. Pressing her other hand onto Mei's muscular back, Imogene sat on Mei and began to hump her. Resuming the violent thrusts, Imogene slammed herself into Mei's posterior, trying to punish her, having a slight chip on her shoulder - individuals with authority are all the same, acting all haughty until someone comes out on top.

Grunting, Imoge drove her massive penis in and out of Mei's cunt, slamming the tip of her battering ram into Mei's uterus; despite not being able to see it, Mei's stomach muscles pulled taut from the enlargement of Imogene's dick, the definition she'd always worked so hard to attain disappeared. Imogene's balls enlarged rapidly, pushing her legs apart.

Precum exploded into Mei's womb at an alarming rate. She'd never encountered anything like it - even when a previous partner had ejaculated inside her without a condom didn't compare to the volume of fluid filling her innermost organs! And each new surge of pre was accompanied by a measurable expansion of Imogene's enormous cock, Mei's small breasts flattened against the table, flattened against her flesh. Her chest skin also began to push out, the imprint of the futa's glans touching her neck, expanding her figure.

Imogene slapped Mei's giant buttocks, turning them an angry red; as she hit one cheek, it bounced up, striking her own flesh. She yanked Mei's head back towards hers by her grasp of her short hair, nearly bending her spine, solely so Impogene could see Mei's face as they made love. And her appearance was exactly what she wanted to see! Gone was the serious, no-fun-allowed expression she always maintained, replaced by a contorted facial expression of pure ecstasy, her tongue lolled from her thin lips, her iris blurred by white.

She had completely shattered Mei!

"Fuck yes, take it, Mei!" Imogene yelled, pounding into her with all her force, "Cum on my cock!"

"Holy crap!" Mei uttered, gasping. As she orgasmed, her body jerked uncontrollably, her vagina squeezed around Imogene's shaft as her cervix convulsed around Imogene's member. A steady stream of fluids splattered across the floor, blanketing Imogene's legs and balls in her juices. She moaned loudly.

Imogene was shocked to learn Mei was inexperienced in sex.

"You don't know what that is?"

As she manhandled Mei, Imogene rushed to the next room and retrieved Mei's vibrator. Returning, Imogene tied Mei's neck and wrists to the corners of the table. Binded, Mei's mouth was smothered with a dirty sock. The futa ran her finger along Mei's cheek, enjoying the moisture, tracing the outline of the black damp fuzz. She gasped as she glanced at the sizable wet spot on the floor a few moments earlier.

Imogene inserted the vibrator into Mei's pussy. Immediately, she started massaging the firm walls of Mei's canal, gently caressing and exploring. The pressure of the vibrator's tip on her g-spot made Mei weak in the knees. Her legs refused to cooperate and trembled as lightning-quick electric shocks pierced her body. Her eyes rolled incessantly, and her nipples hardened, playing with them, the areola around the nipples felt tighter and word had become two tightly bound sensitive bundles on her chest.

A low groan huffed from her throat, her breathing increased; her eyes were getting wider, her face lost its original color and complexion now - she was experiencing one of the most pleasurable, longest orgasms she'd ever had.

At that moment, Imogene knew Mei had transformed into her lick mat, and she was now her human slave. No longer would she yell or complain, instead she would provide Imogene the pleasure she craved.

She'd utterly broken Mei.

The instant Mei orgasmed, it was like she was following the orders of her instructor. Her final lines of defense cracked under the force of the scorching pleasure. She cried out, pummeling the exam table with her fists, and especially with her pussy which tightly seized around Imogene's cock. Her secretions, which Imogene had finally made her produce, steered clear of a trickle and instead turned into an exposion. Fountains of her transparent liquid splashed on the stage, coating the area below her. On the brink of losing consciousness, Mei struggled against the sensations that threatened to overwhelm her.

Ignoring Mei's outburst, Imogene only grew stronger, relenting in her punishment. She pumped her hips with incredible force, seeking her own climax but not even close to getting there. In fact, even though she hadn't even achieved full hardness yet, her cock continued to swell in size. It was so big that it extended beyond the boundaries of Mei's body - right to the point that Imogene could see the side of her opponent's neck while it still remained inside.

Mei's depths sent shockwaves through Imogene's entire being. Each thrust into the woman's cozy holes met with Mei's inner walls contracting around her member, enhancing the sensation. The hot, slick canal that encased Imogene's massive shaft was incredibly tight, leading to wave upon wave of pleasure. This didn't stop when Imogene breached Mei's womb, for it was just as securely clamped on her pole. It was like she was intertwined with her enlarged veins.

As Mei squirted her juices frantically, a mixture of pre-cum and the woman's fluids soaked their bodies, producing multiple stains on the backs of her thighs and the fronts of Imogene's. The runny goo splashed upwards onto Mei's rears, and her mountainous ass was covered in their combined secretions. The pores on her cheeks gleamed under the room lights.

Once more overcome with pleasure, Mei had a second orgasm. At this point, she was nothing like her vigilant self - instead, she was in such a rapture and blissful state that she didn't even have the energy to speak. But that didn't keep her from orgasming one more time. Against all odds, her throat was getting hoarse from constant yelling, yet her roar never ceased. Immune to the pain, Imogene was delighted that the sterile environment granted them the luxury of indulging in their lust. "Qing Qian, this is the best sex I've had!"

"I'm glad you're enjoying it so much!" Imogene declared, leaning towards Mei, narrowing the distance between their lips to merely an inch. Instead of nibbling or nuzzling, she fucked Mei's mouth with her tongue, wielding it as if she urged the woman into submission. Her cock was about to burst from sheer size when Imogene broke the kiss. Intrigued by Mei's reaction to her oral sex, she grabbed her by the hips and forced her to repeatedly slither back and forth, pushing her down and then lifting her back up. Mei's cheeks commenced to strike Imogene's abdomen rhythmically.

With a sly expression, Imogene pulled away from their passionate kiss. After a short moment of peaceful seclusion, she seized Mei's hips and powered her worshipping rod deep into the woman's pussy with each of her thrusts. Mei's continuous grunting and moaning can hardly be outmatched by her tightly clasped muscles; it was a veritable struggle to move without inflicting pain, her vulva teasing Imogene with every in-breath.

"F-Feels so damn great, Cai Jin! God, I've never felt this!" Mei cried into the room, eyes wide open and gaze locked straight onto Imogene's! Upheaval caressed her pussy once more, and Imogene's familiar smirk returned. Instead of kissing her partner further, Imogene grabbed her hips fiercely, screwing Mei as she yanked and slid back and forth. The resounding spanks from Mei's ass indicated her stimulus intensifying before plastering her back onto Imogene.

Almost there. Imogene was so close to being fully erect that her growth was becoming barely noticeable; what previously seemed like inches of thickness and length now paled in comparison to her ultimate state. For the most part, she gauged her arousal based on how ballooned her testicles were - and they were getting quite massive! Her scrotum was about to scrape the floor, her testicles bigger than a pair of Eyebots, jiggling between her legs and piling up gallons of sperm at an absurd rate.

Upon hitting the ground, Imogene's growth halted.

"Feel this, Mei?" She yanked Mei's head back, facing each other once more. "Feel how big I am!? This is my actual erection! See, you helped me get hard!"

Mei shrieked, succumbed to another monstrous orgasm, and then cast her eyes down, surveyed her body; she couldn't actually view most of her own figure, her sight obstructed by the drastic transformation of her anatomy. Her gaze landed upon her skin in a way never before, stretched to a degree unlike anything she'd seen before, the husk of her body suspiciously resembling shrink wrap for a high-end gift! Mei's pallid complexion had tautened to the point of transparency, allowing for an unobstructed view of the intricate details of Imogene's mammoth cock. Indeed, she could identify every throbbing artery, every earthquake-inducing jostle, and every aspect of the futa's member, from its torpid, creamy shaft to the flared, crimson crown with incredible clarity. For good measure, even Mei's line of sight allowed for an uninterrupted view of the lakes of precum streaming from Imogene's urethra.

Furthermore, the transformation of Mei's body was nothing short of grotesque. The diameter of Imogene's phallic musket stretched nearly as vast as Mei's shoulder span, her hips bowing under the pressure of having to accommodate the sleek monstrosity, the hips visibly popping. With futile efforts at relief, Mei wrapped her arms around the girthy sides of Imogene's monster, her chin settling on a segment of Imogene's firmer section with casual ease. Everywhere Mei cast her gaze met with Imogene's member, cradled, pierced, and stuffed by its sheer magnitude, even her legs forced to sprawl wide just to cope with the abrupt reorientation of her small pussy.

If Mei was of sound mind, she would've voiced concerns for her well-being. However, this was not the reality. Perverse delight overcame her at the sight of her nearing defilement, elevating her joy a notch, prompting a cacophony of pleasure floods assaulting her as she was subjected to heightened erotic stimulation she'd never believed possible. Her body writhed under the weight of Imogene's member, undergoing repeated orgasms that not only took Mei by surprise, but also found her spurting, splattering, and dripping with fluids, creating a torrential rainstorm of unmistakable intensity.

Witnessing Mei's surrender ignited a smirk in Imogene's heart.

Initially, she intended on waiting until Mei completed climaxing before embarking on her own rampage, but that appeared unlikely. Mei's cunt erupted with slick fluids, rejuvenating the desire for more of Imogene's love juice at such a ferocious rate it was analogous to wading in the deep end of a hot tub! So she shelved her plan and tightened her hold on Mei's waist, rocking her member counteractively to rekindle the carnal coupling for an unprecedented third time that day.

Since Imogene was as erect as she was going to get - her member nearing the height of herself and Mei - she only retreated slightly when her arms strained to reach Mei's waist, which equated to approximately half her member sliding from its brothershell, forced to exert tremendous effort backpedaling. Then she shot forward, ramming her magnificent member into the annals of Mei, Imogene labouring heavily from the sheer exertion of just a few thrusts - still, the result was well worth the price of admission.

Imogene's fierce hip movements caused the medical examination table to creak and shudder, with Mei's massive behind taking the brunt of each slam, creating a deafening racket of metal scraping against metal. The wheels had been locked into place, which prevented them from being jostled across the room. As Imogene thrust hard into Mei's intimate parts, her testicles swung back and forth, the constant motion causing sweat to drip down their bodies.

Her ejaculate seeped into Mei's womb, filling it with scorching sperm that felt as though it would set it on fire. Mei's weighty frame swelled with shortness of breath, her once toned abdomen becoming bloated. As their bodies collided, the space between them was slick with a mixture of their fluids.

"How are you holding up, Mei?" Imogene asked over the wet slapping of their intertwined bodies and the sounds of fluids hitting the table, "Have you made up your mind about this whole ordeal yet?"

"Oh my goodness! This is... too good!" Mei moaned in ecstasy, her body flailing weakly due to the multiple orgasms. "Please, I need more! Please..."

"Please do what?"

"Please impregnate me! I want to be a mother! I'll do anything for it!"

A joyous grin spread across Imogene's face at Mei's pleas.

"Don't worry, Mei, you'll get pregnant very soon! You'll be able to feel the entire ocean of my cum inside you!"

"Oh my God, it's destroying my body!"

Instead of sympathizing, Imogene became energized by Mei's screeches for pleasure. She grabbed Mei's wrists with dramatic force, lifting her body from the table. She then took a step back, forcing Mei to follow. Holding her up by the waist, she positioned Mei's body above her own, her feet no longer touching the ground. With a ferocious growl, Imogene rammed her crotch against Mei's ass, slamming her up and down, creating deep thrusts into the Security Head. Determined to impregnate her in this position, Imogene's cock was an unrelenting battering ram.

Imogene's entire being was consumed with this fervor - she was determined to destroy Mei's authority with her own sexual power. The intense pleasure Mei was feeling was a far cry from Imogene's original intentions, but she was dedicated to punishing someone who had never truly wronged her.

Despite this rage, Imogene was so consumed with using Mei as her foil in a battle against the system that Mei's pleasure didn't even register on her radar. She kept her focus on the task of reshaping Mei through copious amounts of semen, unworried about the amount of pain she was inflicting upon the lead guard.

Time and again, Imogene's cock plunged into Mei's sensitive pussy. A mixture of precum and feminine fluids gushed out, countless fluids pooling on the floor beneath her feet. The volume of cum erupting from Mei's violated orifice couldn't compare to the ocean of semen she was already carrying, her stomach firmly round and distended. How she would look once her abdomen was completely deformed by the bursting load of her partner's sperm remained to be seen, as it was incomparable to the energy Imogene put into her mission.

She pushed herself to move faster, her limbs trembling from holding Mei aloft. Saliva dripped down her chin - and seemed to drip from Mei's lips - and her blonde hair stuck to her neck, but none of this compared to how her partner looked: Vault 62's main protector appeared worse for wear, almost unconscious after her brutal attack. Her eyes were solely white, her short black hair a tangled mess, her tongue hanging from her cheek - and that was without mentioning her body. Mei was all man, her chest stretched in every direction, her arms slapping against the huge bulge.

Imogene grunted as she neared orgasm. She felt her balls tightening, confirming they were ready to explode inside Mei; they looked as large as they had been before she impregnated Bridget, sitting between her legs and touching her knees, the wrinkled skin of her scrotum smoothed out by the giant masses inside it, veins popping out on its lightly-haired surface. They swelled excitedly, emitting a loud racket from their spheric, sperm-saturated form.

Deciding not to warn Mei of her impending explosion, Imogene gritted her teeth, wanting the surprise to be as unexpected as possible. She thrust her massive penis in and out of Mei again and again, waiting until the last possible moment to release her load, her pelvic floor muscles tightened. Breathing heavily, Imogene arched her back and pulled Mei down, bringing their bodies together one last time before she climaxed, her breasts pressed against her companion's sweaty back, their pounding hearts beating as one.

The dam broke.

Imogene squirted directly into Mei's vagina, the onset of her orgasm's commencing flood. Her urethra opened, allowing the initial burst of semen to reach Mei's womb, making her swell instantly, her stomach widening quickly. The penis extending towards the ceiling and distending her flesh shot up by multiple inches, the force of Imogene's semen ejecting from her vagina causing more disturbance to her figure; it rebounded in the next moment, crashing inside Mei, spreading her organs.

This continued throughout Imogene's orgasm, her initial semen stream not stopping, spanning the duration of a man's entire orgasm from beginning to end with no sign of stopping. Mei's stomach swelled again and again, her tight abdomen stretched away from her body, random sections of her skin distending as Imogene's semen fought for space inside her. After some time, Imogene's pennies of sperm stopped gushing from her cunt, Imogene's mid-orgasm flaccid penis blocking her vagina, replaced with pure female arousal, Mei's vagina spraying like a broken water hose, the quantity of her fluids expelled equal to the volume of the screams escaping from her mouth.

Mei screamed at the top of her lungs, proclaiming her astronomical levels of satisfaction to the gods. Even being fucked by Imogene's massive penis didn't feel as good as getting filled by it did! It might have been that Mei knew she was getting pregnant that did it, but her delight only increased as the scorching sperm splashed into her uterus; when asked about it later, she would timidly admit to Dr. Walsh that it was like she could feel Imogene's sperm swimming through her reproductive tract, packing themselves into her ovaries, itching to inseminate her. She wouldn't be shocked when Bridget would say the same thing!

So overwhelmed by joy Mei was, she lost all control over her body. The sexual euphoria mixed with the liquid pressure on her other organs caused the vault's lead guard to unconsciously relax every muscle she possessed, including the one holding back her bladder; Mei accidentally started to pee all over the exam room floor, a golden stream blending with her other, clearer squirts of pussy juice, the sound of the dual streams blending together. Fortunately, Mei was so caught up in her bliss that she didn't notice, and Imogene was otherwise distracted by her own mind-numbing orgasm.

Not that she would have stopped even if she had noticed!

Ready as ever, Imogene was engrossed in her main hobby: stuffing as much hot cum into Mei as she could. She zoned in on this task with an unwavering focus, aiming to push her load as deep as possible. Mei's physical state changed dramatically as her belly distended, bulging and stretching like never before. It became so large that the edges could be seen from behind Imogene, with a noticeable sagging of her belly against the bottom of Imogene's shaft. Her strength to barely thrust into Mei became insufficient.

Instead, Imogene's sperm began to gush out thick and heavy, unyieldingly jetting into Mei's waiting abyss. She erupted so intensely that her stamina couldn't keep up, and her cock seemed to pulsate as it fired relentlessly, unable to finish her climax due to the sheer amount hidden within her. The cum overflowed, spilling out from between them into a pool of semen, leaving a wave of lust all around. She barely had the strength to half-squat, resting on her cavernous cushion, while also staying rooted to the floor with her feet being overwhelmed by Mei's enormous girth. Despite her extreme fatigue, Imogene knew she could hold Mei for a bit longer, although she'd need to dismount soon.

To the outside observer, Mei's form would have appeared practically unrecognizable. Her body became so gigantic from the futanari filling her up that her features were hard to identify – including her muscular thighs and robust shoulders, as well as her small breasts (now lost in her colossal shape) and even her eyes and nose. Her navel even protruded, and her chin rested on her exhaustive midsection, leaving her like a mere head attached to an enormous sphere of flesh.

At this unimaginable degree of swelling, Imogene began to weaken.

"D-Damn it, Mei! I'm so sorry!" Imogene exclaimed, letting go of her grip on Mei's hands. She staggered back, "Holy crap, you're just too damned heavy!"

Eventually, her retreat was halted. Mei also became unresponsive from the tidal wave of pleasure, unconscious and not able to react as she tumbled forward. The force of gravity pulled her mercilessly to the ground, hitting her cushy belly on the exam table with a violent thud. Her over-sized mass wobbled, resembling a massive ball rolling over the spilled cock juice that surrounded her. She continued to slide down while her limbs lazily draped over her immeasurable midsection, exposing her rear prominently in the air.

It was during this display that Imogene lost control.

"Sh-Shit! Mei, I'm so sorry!" Imogene gasped, breaking free of Mei's grasp. She tripped backwards as she released her hand, leaving a trail of glistening white cum as she moved. Darting towards the counter, she compensated by standing up completely and snatching her cock – the squirting still at full force – and changed her aim to Mei's cunt. It had expanded to a monstrous size, no longer the Small, neat little slit that it previously was. Instead, it was a massive, gaping, nearly pussyless hole, looking more like an expansive canal ready to accept everything she could expose to it. Upon catching sight of this excessively large, solid block of semen, Imogene couldn't restrain her ejaculation any longer. She used her new standpoint to bath the opening yet again with a fountain of sperm, covering Mei with another geyser of her liquid glory.

Petting her giantess, Imogene unleashed another volley of sperm onto Mei. Imogene's powerful liquid showered down onto Mei, striking its mark and drenching the outside of her pussy while also splattering around the rest of her deformed figure, drenching every inch of her - there was a lot to drench! Mei's belly was so round, so incredibly huge, that her hands and feet didn't touch the ground while laid out on it, her body lifted by the sheer volume of her gallons-worth of goo-filled uterus. She might've been bigger than Bridget was when Imogene was done with the Overseer!

And like Bridget, Imogene inundated her super-potent semen repeatedly onto Mei, moaning uncontrollably during the rest of her climax. She swung her dick in every direction, coating Mei's form and much else in the room with her spurts. Imogene's explosive ejaculation couldn't be stopped, splatters of cum streaking across walls, counters, and whatever else got in its way, posters thrown to the floor, the exam table rocking violently whenever it got a hit. Most of her massive load smothered Mei, though, dripping over her shape every moment.

Gripping the counter, Imogene waited out her climax's final note. She'd occasionally yank her hand off her member to wipe sweat from her brow or blobs of cum that managed to leap over the multiple-foot distance between her and Mei to coat her face. Her balls rumbled furiously, rattling the doors behind her, straining from the work it took to spill their contents. Watching Mei, Imogene was surprised to see that none of her womb-targeted sperm was leaking from her pussy, staying put like it was solid slime.

It would take a few more minutes before Imogene could move again.

Cum streams, ropes, and wild splashes flew from her glans one after another. Each shot blanketed Mei's body with a white coating - mostly focused on her bulbous stomach - drowning her from her toes to the front of her oversized midsection, mounds of progeny forming then collapsing off of her. Imogene was chest-deep in her own goo and Mei's still-gushing nectar, the exam room noticeably smaller than Bridget's office; she wondered if the canyon of her stuff created from her own essence had spilled out of the room through the gaps in the door, but she'd know soon enough! Pearl-colored syrup dripped from the ceiling, cascaded down walls and counters, and lacquered the legs of the exam table, every surface buried in Imogene's semen adding to the toothsome stench hanging in the air.

Tired of waiting for her climax to fully wane, Imogene pushed away from the countertop behind her. Still spurting buckets of sperm, she waddled over to Mei and dragged her balls after her. Her body was made up of her own genitals as much as the Head of Security's was futa seed! Imogene nearly stumbled and glanced down to see what had caught her foot; it was her own vault-suit completely submerged in her boiling sludge. Maybe she'd just end up wearing Mei's uniform when she finished here!

She slogged through the cum lake to Mei's front, placing a hand on her bulging tummy.

"Did you pass out?" Imogene questioned the Head of Security with a chuck under her chin, "Yeah, seems that way. I wonder if anyone else won't end up unconscious once I fuck them..."

Just like with Imogene's treatment of Bridget, she roughed up Mei more than usual.

"Wake up, Mei! We're not done yet. You got more to do!"

She smacked her cheeks repeatedly.

"Ow! What's going on?! Where am I?!" Mei jerked into awareness, looking around the room in panic.

"It's me, Imogene!"

Mei seemed unable to articulate for a moment.

"Thank you..." she mumbled quietly, almost inaudible even to Imogene's ears, "Thank you for showing me what sex is really about and making me a mother."

Imogene was taken aback by Mei's sincerity.

"No problem there, I had fun too. And to be fair, we don't know for certain that you're pregnant yet."

"Believe me, I am!" Mei gasped, looking down at her large belly. "It's impossible for that much semen not to impregnate me. I could feel it happening - it was like nothing I've ever experienced before."

She struggled unsuccessfully to roll over onto her back, her legs stuck in the soft cushion below.

"Help me out, please?"

Imogene chuckled and gripped Mei's head, turning it towards his hard cock.

"Not just yet, Ms. Nakamura. I'm not finished with you!" He laughed at Mei's shocked expression. "And I love the fact that you're stuck. It allows me to have as much fun as I want!"

Letting go of Mei's head, Imogene paced around her, trailing a finger across her swollen form.

"Unless, of course, you don't want me to keep going?"

"No! I mean yes! Please fuck me again. I, uh, I mean at least just to make sure the insemination was successful - I'm a very busy woman."

Imogene spanked one of Mei's cum-covered cheeks, eliciting a cry from her lips. "This is entertaining, seeing you trying to keep your composure as the Head of Security."

Imogene liked this new side of Mei.

Read also:

• My Close Friend, a Female, Fondled Me
• A Stepmother's Varied Testimony: Volume 3
• Listening to Their Groans: The Complete Narrative
• Slim, Youthful, and Well-Endowed in Part 2

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