The Erotic Mind-Control Story Archive

An Artificial Ass

Rachel sighed as she set her coffee mug down on her desk, with the sun setting on another boring day in the office. With most of her underlings already packing up shop for the day, she decided as the boss that it was time for a quick trip to the bathroom to freshen up before she too left for home. Her scarlet ponytail swayed as she got up from her desk and manoeuvred her way down the hallway.

On the way there, she had the displeasure of encountering the lowly IT technician she had told off last week for being lazy. As per usual, he seemed to be standing around doing nothing.

‘You’re not being paid to stand around in hallways you know.’ she berated him sternly. ‘I was being serious when I talked to you about this last Monday. If this kind of behaviour continues, I’ll have no qualms about reporting you to the higher-ups.’ The dour man looked over his glasses at her with annoyance.

‘Like I said before, I’ve done all the work I’ve been given for today. Why can’t I have just a moment alone in this corridor instead of being pestered twenty-four seven?’ he replied in a pained tone. Rachel smirked behind her own glasses.

‘Someone like you who does nothing but moan all the time doesn’t deserve breaks.’ she said smugly, placing her hands on her slender hips. ‘Well, I suppose I could let you off with a warning this time, since I have to be going soon anyway. Tata.’ The man grumbled but said nothing in response, as she walked by confidently, and entered the ladies’ room.

As she walked by the mirror, she stole a quick glance in it. Her 25 year old body was medium-height and slim, with breasts only an A-cup (which was just fine by her), and dressed in an ordinary business suit with knee-length skirt.

With one of the cubicles mysteriously out of service, she entered the remaining one and shut the door behind her. A strange plastic device stuck just under the rim of the bowl caught her eye, but she dismissed it as something the cleaners must have added to make the toilet smell nicer. Slipping off her skirt and underwear, she placed her behind on the seat, taking solace in the quiet solitude of the place after a day of sending tedious emails and nagging her subordinates.

It was just as she was settling down, that suddenly she felt herself penetrated in the ass by a metallic thing. Jolting with surprise, she looked between her legs in horror at a stiff rod protruding from that weird plastic object, going directly into her asshole. Stunned with the bizarreness of the situation, she vaguely noticed something hard expanding inside her and pressing against her inner walls. With this, she finally moved in alarm and jumped up from the seat, and to her surprise, the metal rod broke off as she did so.

But as she checked her rear entrance, much to her despair, the end of the metal thing was still firmly inserted in her ass. Grasping at the rim, she noticed a strange synthetic coating now covering the diameter of her asshole. Despite how soft and fluid the material felt though, it wouldn’t move or budge no matter how much pressure she put on it and annoyingly all it succeeded in doing was moving around the small object in her anus. What on earth is this thing? She cried to herself in vexation.

It was just as she was entering a state of panic that she heard the door to the bathroom open, and a familiar voice started talking from behind the stall door.

‘Judging by the sounds going on in there, it looks like you discovered my little toy, Rachel. I wouldn’t bother trying to remove it, it’s quite difficult.’

‘W-what the hell?’ she spurted out angrily. ‘What have you done to me you creep? Tell me how to remove this thing this instant!’

‘You’re not very good at listening are you? It would be pretty difficult to remove right now. In fact I suggest you listen to what I have to say before doing anything else.’ he continued in a self-assured voice.

‘Why should I listen to a single thing you have to say? This is sexual harassment—no, it’s rape! I’ll call the police on you right now you fucker.’ she threatened menacingly.

‘Ah, before we do anything like that, I want you to know something first Rachel.’ he replied calmly. ‘That device has the ability to expand, ah, quite dramatically if I decide to push this little button here. Basically, if you don’t want your asshole to be ruined for life, I suggest you at least listen to what I say.’

‘Wha- what do you mean expand?’ she growled back.

‘Well perhaps I should give a quick demonstration.’ he said. Just as she started uttering words of protest, she heard a beep from the other side of the door, and suddenly she felt the plug start to press outwards on her anus. Gasping helplessly, she felt her asshole expand due to the device, first to just a small opening, and continuing until it left a gap the size of a cherry.

‘S-stop already! I’ll listen so stop!’ she cried humuiliatingly. The mechanism stopped, though it didn’t contract, leaving her asshole gaping wide. Having never had anal sex before, her ass had never been opened so far, and it was fairly painful.

‘Very good.’ he said in a snide tone. ‘I know you and I haven’t been on the best of terms recently Rachel, but I do hope we can come to an arrangement over this.’ She grinded her teeth in anger, her ass paining her, but nevertheless had no choice but to listen. ‘That device is just a little thing I’ve been working on in my spare time. As I’m sure you’ve seen, it’s quite secure; it’s sealed on the inside by opening up in your ass like a sort of mechanical flower. On the outside, that material fits quite tightly to the outer rim as you have no doubt noticed; for all intents and purposes, it acts as a second asshole. Just think of the whole thing as an expensive and intricate butt plug.’ he finished smugly.

‘Okay you bastard.’ she grumbled. ‘That’s really fascinating and all, but what will it take for you to remove this thing?’

‘Oh that’s really quite simple.’ he replied nonchalantly. ‘I’m willing to let your recent harassment of me slide, and I’ll even remove this thing without any hassle’ he drew air through his teeth. ‘But as punishment, you have to keep that thing in your ass for a week.’

‘Wha- are you serious? A whole week?’ she cried in indignation, distinctly aware of the alien object currently forcing her anus open. ‘There’s no way I’ll agree to that! Besides, this thing won’t open... I mean, how am I supposed to... relieve myself.’ she trailed off, blushing.

‘Oh you needn’t worry about that.’ he laughed knowingly. ‘Any time you want to go to the toilet, just text me on this number and I’ll open it up nice and wide for you. I’ll even close it afterwards.’ he chuckled, slipping a piece of paper under the door.

‘Y-you must be joking.’

‘Oh but I’m deadly serious. Just consider it for a second. You go through a week of this, and I will be satisfied; no one has to know about it.’ Then he added in a lower more menacing voice. ‘Think about your pride here, Rachel. Wouldn’t it be better just to keep this between us?’

Rachel was fuming, but at the same time, he had a point. Whatever happened, as the boss of this office, she didn’t want anyone to know about this. Besides, all she has to do was let this pervert have his way for a week, and then if she wanted she could call the police anyway, without damaging her body. Yes, this way I can avoid him doing anything stupid, and at the end I can make him pay. After a few more moments thinking, she decided on it.

‘...Fine then.’ she muttered. ‘A week, and then you better remove this thing. Now... close my asshole for god’s sake.’

‘With pleasure.’ he replied happily, and she felt the pressure ease again, the silicon cover slipping back into place nice and snugly. ‘By the way Rachel, my name is Brian. I’d appreciate it if you remembered that.’ and with that, the door closed behind him.

That smug bastard she thought to herself. Who does he think he is? I’ll get him back if it’s the last thing I do. Hiking up her skirt, acutely aware of the sensation of what was essentially a butt plug in her ass, she silently left the office, trying to draw as little attention to herself as possible.

Later that night in her apartment, she felt herself in a predicament. After further feeling around her ass, she really could see no way to remove the device inserted there. However after having left the cubicle earlier in a hurry, she now needed to relieve herself. Hating herself, she sat on the toilet and typed in the number she had written on the paper.

Open it up. was the curt message she sent. Waiting humiliatingly for a few moments, she suddenly felt the walls of her butthole being forced open, and she was finally able to let it out, much to her satisfaction. It felt distressingly good. Strangely, she didn’t have to wipe, the surface of the silicon material feeling slippery and clean. Afterwards, she waited there with her asshole open, feeling like a child being forced to sit on the naughty step, before finally the device contracted and she could put on her panties. I can’t believe I’m being forced to do this, she fumed to herself. Nevertheless she went to bed, trying to forget the fact that somewhere else in the world, a man had the ability to do whatever he wanted with her asshole.

The next day, Rachel went into the office just as before. The only difference was a certain unwanted visitor lodged between her ass cheeks. She couldn’t help but be aware of it, whilst sitting down cross-legged in her chair, whilst striding around the office, and in particular when bending over to pick up something. To make matters worse, her asshole somehow seemed more sensitive than before, and every little sensation was embarrassingly amplified. The end of the day could not come too soon for her.

When it came time to go home, she once again walked through the corridor to the bathroom, only to again see the IT man sauntering around. He gave her the tiniest of smirks as he saw her, and she suppressed the urge to punch him in the face. Instead, she went up to him and whispered irritatedly to him.

‘Hey, you’d better push that button in about a minute.’ The man frowned at this slightly.

‘I’d prefer it if you called me by my name you know.’ he spoke softly. ‘It’s Brian.’

‘Fine- Brian or whatever. Press the button.’ she growled in annoyance.

‘Huh. Well since you only half feel like giving me any respect, I’ll press it, but you’d better run.’ then he smirked again, reaching into his jacket pocket. Rachel’s eyes widened and she ran for the door, cursing him under her breath as she went. As she entered the bathroom, she felt the familiar feeling of the device pressing against her anus, and she had to quickly dash into one of the stalls and pull her underclothes down. Just on queue, her butthole involuntarily expanded once again to form an erotic O, and she was able to relieve herself. As before, the sensation was humiliating, but for some inexplicable reason oddly arousing.

She couldn’t help but realise that even if only for a week, this man had her at his beck and call. She hated it, but the idea gave her just the slightest thrill.

As the week continued, the indignity she had to suffer through only grew worse. The day after, she sent a text to the man at home asking for the usual, but Brian only acquiesced to her request after she added a ridiculous Please, Brian to her text. She did so grudgingly and with gritted teeth. The following day, the ante was upped to a smiley face as well, and realising this would only go on and on, she refused point-blank. It was only afterwards she realised her mistake, as she suddenly felt her asshole forcibly opened to a size much larger than before. She was forced to endure the pain and humiliation for a full ten minutes before finally she was allowed reprieve.

What’s more, her asshole was strangely becoming more sensitive by the day. When the switch was activated, she almost had to suppress a moan as the walls of her anus were opened. Why does it feel so good? she lamented to herself, as she absent mindedly ran her finger over the smooth plastic of her asshole.

Furthermore, she wasn’t sure if she was imagining things, but her ass itself seemed to be growing rounder and bigger. She first noticed it the following morning when pulling up her petite white panties over her butt, and feeling the fabric being sandwiched together by her two ass cheeks. Even her hips seemed wider than before, and she felt the underwear stretching as they struggled to fit over her recently enlarged body. Standing in the mirror back to front, she almost couldn’t believe her eyes as she gazed at how slim figure had started to become more rounded and sexual. Having the sudden urge to slap her ass, she did so, and instantly became ashamed at how good it felt. What am I being turned into? she lamented to herself.

On the fifth day, she kept being distracted by the feel of her rounded ass as she sat at her desk. Sexual thoughts kept entering her head, of bending over and her asshole being stretched out, of licking things and inserting them into her plump ass. She had to resist the temptation to put her hand down her skirt and feel the smoothness of her new anus, and when she caught herself thinking this, she admonished herself in shock.

When she was at home and the time came to go to the toilet, she almost felt herself anticipating the moment when she would feel that release. She found herself texting the message: Please open up my asshole Brian :) not even caring how much of a slut it made her seem. After several moments of waiting, the response came back on the screen.

Isn’t it about time you started calling me Master? She read this message with shock and indignation. This man was just treating her however he wanted, like his possession. But a part of her wanted it so badly she didn’t care. It wasn’t long before she gave in, and she once again felt her fingers moving along the keyboard of her phone.

Master, please open up my asshole ;) Not even realising she had sent a winking face until the message had been sent. Within a second, she felt her anus begin to acquiesce, and she couldn’t stifle a moan as it stretched out to a glorious size. She sat there helplessly as her excrement began to pass through, stimulating the walls of her asshole as it went. She couldn’t help but touch her hand to her vagina, feeling how wet it was, and how good it felt to obey her master and be a good girl. With her anus stretched to an obscene size, she started cumming as she rubbed her clit and thought about how sexy and perverted her body had become. After the waves of pleasure had run through her, she was left sprawling on the toilet seat, feeling ashamed and aroused.

It was the final day, and she woke up feeling light-headed. She gazed at her figure in the mirror, her dainty panties barely stretching over her newly adapted hips and ass. She seemed to have an hourglass figure now, and unless it was her imagination, even her petite breasts had grown slightly larger from an A-cup to a B-cup. She didn’t understand these changes and a part of her was scared by them, but she couldn’t help but run her hand down her shapely ass and brush her fingers over her plastic artificial asshole, giving her a shimmer of pleasure.

It was then that she got a text from Brian himself. The message said the following. If you want me to remove the plug, come wearing a short skirt and no panties. I’ll be waiting in the usual place. She was surprised by the request, but somehow she felt no hesitation in obeying it, slipping her panties off her rounded hips, and donning a skirt that would have probably fit better on a school girl. If she wasn’t careful like this, it would be easy for people to catch a glance of her bared ass and perhaps even her modified butthole. She almost shivered in excitement at the thought.

Sitting at her desk, she was acutely aware of her large bared ass, and the tiny object nestled inside of it that was capable at any moment of reducing her to a helpless squirming heap. The day seemed to pass slowly as she felt both excited and apprehensive. She was probably most nervous to see once again the face of her Master- or Brian, as she quickly admonoshed herself. She didn’t know what he planned to do with her. Of course, she wanted him to uphold his side of the bargain, and remove the plug from her ass. That’s what she wanted, right? But a part of her felt that if he refused, then she was completely at his mercy, and that she had no way of refusing his will. Pull yourself together Rachel! she berated herself. If I have to force him to remove it, then so be it. I can’t just become a slave to this thing!

Yet when the time came to meet him, her knees felt weak. Seeing him in the corridor, she tried to adapt her stance to one of defiance, putting her hand on her hip and raising it, only afterwards realising how suggestive this pose looked in her bimbo body, with no panties and a miniskirt.

‘L-let’s go to the ladies room, then. You can take it off there.’ she stammered with a blush. Brian smiled confidently in response.

‘You seem much more docile than before Rachel. Excellent.’ he murmured. As he walked past her, he slapped her firmly on the ass. She went even more red, but didn’t have the willpower to do anything in return, so meekly followed him in.

When they arrived, Brian’s eyes studied her body in its entirety, arms folded and a smirk on his face.

‘Well, I can’t do anything unless you bend over Darling.’ he teased mockingly. With a furious blush, she slowly turned around, then sucking up her pride, she bent over at the waist, rising her humiliating bubble butt high into the air. He casually walked towards her raised ass and lifted her skirt, exposing her modified asshole and wet pussy for him to see clearly.

‘Magnificent.’ he said admiringly. ‘You know my dear, I think it’s about time I let you know the truth about your new asshole.’ He then pushed a button inside his pocket, and without warning inserted his finger into her ass. She yelped with shock, both upon realising that the soft flesh of the plastic easily parted to his fingers, and from the sudden amazing sensation that came with it.

‘Wha- what are you doing?’ she cried, unable to move from her bent over position due to the sudden pleasure being transmitted to her ass.

‘I’m helping you realise the reality of your new status as my slave.’ he grinned whilst moving his finger around in her ass, making her helpless to do anything but moan involuntarily in satisfaction. ‘The truth is that device is far more complex than I let on. During this week, it has been attuned genetically to your asshole, and it has gradually merged with it, becoming a part of your body.’ he continued gleefully. ‘Once this had occurred, it allowed me to program changes directly into your body, making you far more sensitive around your asshole, and even allowing me to alter the shape of your body to one as large and round as I wanted it.’

‘You’re mad Brian, I- uooooooohhhhhh’ she moaned as he suddenly plunged three fingers deep inside, causing her to gasp and quiver in ecstasy.

‘As we agreed, I will remove the restrictions from your asshole, but unfortunately the device itself can no longer be removed. This synthetic cover is your new asshole, and so too are these gigantic voluptuous hips and rear!’ he exclaimed mockingly, swirling his fingers around inside her, which in turn forced her onto her hands and knees in mewling helplessness.

‘But this alone isn’t good enough for you, is it my Dear?’ he paused, removing the fingers, covered in slimy love-juice. Rachel bit her lip as she timidly looked back over her massive ass. She didn’t want to become his slave, but it was already too late. She felt her asshole twitching in anticipation, wanting something bigger and hotter to mould it into shape. Unable to stop herself, the words spilt from her mouth, betraying her last remnants of free will.

‘Please master, make me your slave and fill me up with cum.’ she mewled. Smiling, Brian took hold of her ponytail like the rein of a horse, and placed his thick cock against her opening. She couldn’t help but notice how large and warm it felt, and how ready her ass was to be penetrated by it. The next moment, she felt the wonderful sensation of her plastic lips parting, as they welcomed his cock deep into her ass. She was unable to hold back her cries of ecstasy as his rod began to pound into her, causing her wide hips to involuntarily rock back and forth. Her modified asshole gripped tightly around the cock, like it was giving him a blowjob, and the sensation of his heat rubbing against her walls caused her to endlessly moan and buck. With each thrust, another part of her that wasn’t already his slave was erased, and she felt herself becoming completely his pet, his plaything.

She could almost feel the fluid changes in her mind, as her own asshole altered her to become more and more of a slut. With each lunge, her bum grew even rounder, and her swinging tits grew larger and filled with milk. Each time he entered her, she let out a mewl in pleasure, and her reliance on cock increased. She couldn’t stop the drool coming out of her mouth as she was penetrated, and soon her tongue started hanging out her mouth like a bitch in heat. She whimpered as her head was pulled back at the ponytail, and she automatically responded by raising her ass in the air to receive his cock. After a few more seconds, it became too much for her body to handle.

‘I-I’m cumming!’ she yelled in rapture, as his dick simultaneously started pumping semen into her ass, and with each gush, she was made more of a slave to cock. The changes were being programmed in her mind, and she had no choice but to accept them as she squirmed in pleasure, her body in sync with her new sex-addled mind. She had become a bimbo sex slave, and addicted to anal sex.

She collapsed in a heap, cum oozing out of her asshole as she lay there with her mouth open in a state of bliss. Brian grinned as he knelt down to kiss his new slave deeply. She instinctively met her Master’s tongue with his own, and she absent-mindedly started played with her ass and pussy with her hands.

‘I have many plans for you, my dear slave.’

Months later, Rachel sat at her desk with her legs crossed and a nervous smile on her face. Her ass was as big as a balloon now and tattooed with the words Fill me with cum ♡ As she waited for the day to end, her wide child-bearing hips swiggled on her chair in anticipation. Her boobs now matched the size of the rest of her body, and were huge DD-cups, both of them pierced as well. After the modifications, they lactated at the slightest pinch to her nipples, and she was forced to orgasm helplessly each time.

She drew stares from the rest of the office a lot these days, not least because of the slave collar round her neck that could barely be described as a choker. But on top of being most pleasing to the eyes, she was also far more lenient and cheerful as a boss, so no one said a thing about her transformation.

When the hour came to finish, apprehensively walked over to the desk of a certain IT developer. She leant towards his ear, her huge breasts pressing heavily against him, as she whispered erotically to her master.

‘Um m-master. Could we do it tonight? I-I need it in my ass real bad.’ she pleaded in a girly tone, her bottom swaying from side to side. The man smiled and took her arm. Sometimes she was a bit too much, even for him to handle.

‘Yes dear, I look forward to spending the whole night satisying your needs.’