The Erotic Mind-Control Story Archive

Monica nearly slammed her phone down with a mixture of frustration and despair. It wasn’t enough that she was still working out the kinks on the newest formula, no.... Making a world-changing chemical compound on a tight budget and a limited timetable, that was easy. Trying to do it while knowing your house was soon to be invaded by your niece and nephew, that’s the challenge.

It wasn’t that she didn’t like the two of them, and they had certainly both mellowed after high-school. It’s just that the driven, brilliant thirty-something didn’t really see how they would all mesh, even in the slightest. Still, a favor was a favor, and she owed their mother big after helping to pay her way through college.

That was the crux of it actually. Whereas Monica had gone straight from college to high school before launching right into a successful career, her sister Elizabeth had stopped to have children. Children who had both decided that lazing around the house was a better use for their post-educational time than seeking any sort of serious life path. Elizabeth was hoping they might rub off on her... Monica had doubts.

Monica slid the phone away, trying not to look at the steadily marching time. “Focus, Monica, focus...” she muttered to herself, shuffling through her notes. The concept for the project was simple: unlock the potential of sexually related hormones in the human body. This could allow for decades’ worth of data on how the human brain works, to say nothing of the applications in sexual therapy or even recreation.

She had already managed to isolate it down to two individual compounds, one for the dominant mate and the other for the submissive. The problem was one of refinement at this juncture. While tests had proven that the chemicals really did kick the body into overdrive for the test subjects, all experimentation had shown that there was really no way of turning them back off. Adding a few nymphomaniac mice to the world was no big thing, but at this stage human trials seemed like they would never be a possibility.

Monica stood up, wandering her lab a bit to clear her head. Before long she ended up in front of the little refrigerator that housed all the red and blue samples. Opening it, she carefully lifted out one of the beakers of thick red liquid and held it in front of her face. She stared at it almost accusingly, swishing it around as she considered ways to dilute the effect.

Just as she was about to put the sample back away, the unspeakable happened. Bane of her existence to the end, her phone began to buzz with a text message. The sound broke the silence and her concentration at once, and the thin glass beaker fell to the floor with a sharp crash.

Still tired and more than a little angry, she reached down to try and clean up the spilled bit without thinking. A few seconds into the effort, she looked down and realized she had just somehow failed at one of the first rules she had ever been taught about dealing with chemicals: wear your gloves.

Her soft hands were now coated in the sticky red liquid, and she felt her heart begin to race. Quickly, faster than she had ever remembered moving, she ran to the sink and scrubbed hard. As she cleaned, she admonished herself for her stupidity, even as the heat rose through her body.

Hands still stained, she stumbled away from the sink and towards her beat-up, old, thinking couch. Her head spun as she flopped back on the cushion. Legs wide open, a dark patch began to spread in the crotch of her slacks as her cries of discomfort and confusion turned into long moans and hurried gasps.

Lab coat open, Monica pulled up her shirt and almost violently squeezed her breasts. Hips bucking, nearly growling with need, she managed to tear one hand away from her chest only to shove it down under the waistband of her pants. The force of her arm popped the button clean off and a thin line of drool fell out of her mouth as her needy sex finally got some attention.

Rubbing frantically at her overly sensitive pussy, Monica felt her entire body move. Everything felt incredible. Even the rough and beaten down material of the couch cushion felt like a massage against her as she writhed around on it. The need to fuck thrummed throughout her very being.

Soon her fingers simply weren’t enough, and she staggered from the couch and tore off her pants. Grabbing the long cushioned seat and throwing it to the floor, she mounted it violently; crying out in lustful joy as her clit was stroked along the embroidered fabric. She took it like a dog takes his bitch, thrusting her cunt against it with only her own pleasure in mind.

It didn’t take long before the motion began to cause her need to reach apex, and she rode her impromptu lover with a frenzy she had never known. Pounding into it and feeling the orgasm pound into her in result, she let out moans that would make a porn star blush. Reaching forward, she bit down on the cushion and rubbed her sweat-soaked tits against it, her pussy dribbling as she came down from the dizzying height of her climax.

Panting, grunting, she let her thighs relax and she felt the cushion spread out again under her. Exhausted, she collapsed on top of it with a sleepy smile on her face.

Human Trial, Preliminary Findings, Personal Notes:

Last night a lab accident resulted in myself, Dr. Monica Sevinson coming in contact with formula SS419a. Initial experiments from animal testing had shown that upon being effected by the compound, the subject would quickly devolve into a wholly sexual creature. I can say now that, as far as I can tell, this is not the effect it has on humans.

First contact did have a rather aggressive carnal response, and the majority of the last twelve hours was spent rather forcibly relieving my arousal with a makeshift mate. It was hard to gauge the amount absorbed however, and the extent of my reaction could easily be linked to a simple overdose.

That being said, as dawn arrives I find myself once more reaching normalcy, and aside from some not-unpleasant tingles still present, I am largely back to my typical self. Tests of cognition, reflex and memory have all shown that my faculties are at least equivalent to what they were pre-SS419, and in the case of reflex at least, there is actually improvement. Further study will help to verify the effect.

Additionally, despite having gone most of the night without conventional rest, I find I am energized and focused. Still, I will remain vigilant against any sort of adverse conditions brought on by the compound and report them accordingly. More as the situation progresses.

Nearly buzzing with a pleasant sense of vitality and contentment, Monica set about cleaning up the mess in her lab, both of the compound and the sopping wet couch seat she had spent last night molesting. She smirked to herself a bit as she stripped off the cover, glad once more that she had elected to get a spill-proof cushion.

As she loaded the damp cloth into the washing machine, she found herself randomly stopping to sniff at the dark spots that ran along it. She had never been one to be very fond of her own scent before, but now it was strangely compelling. It didn’t just smell like her own arousal now... it was more powerful than that. Still, the feeling passed as she closed the lid, and she found herself humming softly as she finished preparations for today’s events.

Her nephew Max was driving their mother’s dinged up sedan when they arrived, and Monica could see the bottoms of Annie’s shoes perched on the dash. She walked out to meet them with a smile.

“My, look at the two of you! How long has it been, four years?” Monica said as she looked at them both appraisingly.

Though they were twins, they looked very little alike. Annie was perky and petite, only managing to come up to her brother’s shoulders. Still, she made up for her lack of height in toned muscles from years of soccer and other sports, and her lightly tanned skin provided the perfect highlight. The little tomboy’s one concession to pure girlishness was her long brown hair. Braided tightly and contained, it could almost reach her ass if let loose.

Where his sister was short and cute, Max was growing into a fairly sizable young man. While his mother spoke of his laziness, Monica had to believe he had to be doing something, because the boy’s muscles were noticeable. Add to that his wavy hair and steel-blue eyes, and she knew he had probably given more girls than he realized some pretty intense fantasies.

It was Max who approached first, and wrapped Monica in a friendly hug. “Hey aunt Monica, how’ve you been?”

“Oh, you know, saving the world and all that... How’s your mother?” She spoke calmly, but Monica couldn’t help but notice that the tingling had increased exponentially as she was held even briefly in Max’s arms.

“Ugh, she’s still kind of a bitch, as always,” came Annie’s reply as she bounced up and took Max’s place hugging her aunt. The girl’s soft hair tickled her cheek, and she had to fight to keep herself from prolonging the embrace.

As they parted, Annie was sniffing. Blushing slightly, she looked a little confused. “Aunt Monica... what’s that perfume you’re wearing? I... I need some.”

Monica blushed herself, knowing the effect her pheromones would be having on the young girl. She chided herself, repeating in her mind that these two were family, not mates... But regardless of what her conscious mind was saying, her body wasn’t getting the memo.

“Oh, just some new thing I’ve been working on... I’ll show you later. For now, both of you come in and get comfy. The guest rooms and bathroom are just down this way. Also, please, just Monica. ‘Aunt Monica’ is a little bit formal, don’t you think?”

With a smile she ushered them in, only barely trying to keep her eyes from gravitating towards their backsides as they moved.

Dinner was an awkward affair. Despite her drive and work ethic, Monica had never really got around to picking up any sort of skill in cooking. Still, neither guest seemed to mind the idea of pizza in the least, and when she explained that it was pretty much that, Chinese take-out and fast food for the next few weeks she got a pair of excited high-fives.

“Now, there’s going to be a few rules I need to set down,” she said, addressing the two of them as they wolfed down more food than she had thought possible. “First, this is not a vacation. Your mother sent you both here to see what real work is like, and as such I expect you to do your part...”

As she spoke down to them, ordering them, she felt the heat rise in her again. “You’re going to work until you’re covered in sweat... I’m going to ride you both so hard you’ll beg me to stop. I —”

Taking a shaky breath, she noticed they were both staring at her like she was insane. Looking down, she saw why. She had been grabbing at the table cloth in her grasping hands, and now much of it was bunched up against the crotch of her pants. Thankfully, the two of them knew nothing of her episode the night before, or they would know exactly what she was about to do. Instead, she hoped they just thought she was really, really passionate about work.

Annie spoke first, grabbing her plate that had traveled along with the table cloth. “Relax, Monica. Mom told us both how strict you can be, and we told her we’d try and be good. Besides, for real food like this every night, I’d be practically willing to take up stripping.” Unphased, they both started eating again.

Monica shuddered as a brief image of her petite niece sliding athletically down a stripper pole ran delightfully through her mind. She forced herself to slowly let go of the abused cloth and excused herself from the table.

She barely got inside the bathroom door before she tore off her pants and underwear. Her panties were completely soaked, and she was surprised neither of her visitors had noticed the scent. Bottomless, she held onto the countertop and looked at her reflection in the mirror.

Desperately she tried to center herself. She thought of logic puzzles, equations, even the multiplication table, but no matter what she did, all she could think about was going in the dining room and claiming the two young people in it for her own. Managing to restrain her impulses, but just barely, she burst bottomless out of the bathroom and down to her lab; locking the door and leaping for the couch.

“So, Aunt Monica’s a bit intense, huh?” Max mumbled as he finished his dinner. He had been wary when his mother had told the two of them they’d be staying with their aunt for the next few months, but if that was the worst he had to deal with, he was more than content. He also had to admit, though he was a tad ashamed by it, Monica certainly wasn’t hard on the eyes.

“Yeah, that was kind of crazy. Still, this place is pretty bare bones, I don’t know what there really would be to do around here.” As Annie spoke, she got up and started meandering about. “Hell, the messiest thing I saw was some unraked leaves out there in the front yard. Money says that’s your task tomorrow.”

“Fuck it, I can rake. As long as I don’t have to deal with mom whining about college another night, I’ll rake all goddamn day,” he said, getting up from the table as well. Brief exploration into the den revealed that not only did his aunt have a pretty nice TV, she had an excellent cable package as well.

Annie made her way to the bathroom, starting to get a bit tired after the drive and the gorging. As soon as she stepped in the bathroom though, she had other things on her mind. She didn’t know quite what the smell was... Part of it smelled like her aunt’s perfume from before, but it was mixed with something else, something deeper.

It was like the exact scent of the first time she let Sam Franco put his hand down her pants, or the precise aroma of how she felt when she saw her first naked cock... or that time she had accidentally stumbled in on Max as he was getting out of the shower.

The images swirled in her head, and she found her little black thong suddenly feeling wetly, noticeably there as it slid between the lips of her pussy. She started sniffing her way around the room as one hand pulled at one of her little nipples. Both out of the pleasure of her pinching fingers and to help to find the scent better, she closed her eyes, and the visions of sex and arousal became infinitely more complex and unrestrained.

Daydreams of her friends being fucked by her brother as she watched mixed with scenes of her offering herself to anyone and anything that would take her. Her body twitched and tingled as she fell to her hands and knees, and scent flooding her senses. Eyes still closed, she moaned as her face touched the source. Still slightly warm, she rubbed her face lovingly against the wet fabric before resting it there and raising her ass up in the air.

Reaching back, she slipped off her jeans and pulled the thin fabric of her thong to the side. Not moments later she had shoved two fingers inside herself, while her other hand worked at her exposed and sensitive clit. Her body shuddered as each push only served to mash her face harder against that perfect, primal scent even more.

Her eyes opened as she felt her stomach twitch with the familiar growing pleasure of climax. Immediately she recognized that she had been burying her nose against the wet crotch of her own aunt’s panties, and for a moment she actually tried to stop herself. It was too late, however, and as wave after wave of mind numbing lust washed over her, Annie felt her tongue slip out of her mouth.

Heaven hit her taste buds and her body rocked with need. Moans became whimpers as the sensations thundering inside her became almost too much to bear. Greedily she lapped at the juices that had soaked the panties, and her fingers matched her tongue’s frantic pace. Her orgasm showed no sign of stopping, and she felt like she was going insane from the fire raging inside of her.

After an eternity she felt it subside, and it took with it all her remaining energy. Shivering, shuddering, she laid on the bathroom floor in a puddle of her own arousal. Her tongue still licked slowly at the delicious taste, and her mind was wrapped in a dizzying haze.

As she came back to herself, the first thing she did was pull her mouth away from the cloth. It was much, much harder than she had expected it to be, and she ended up backing up and kicking the pants to the other side of the room. Panting softly, she still casually rubbed at her prominent clit, but compared to the feelings still storming around her body it was no more than scratching a minor itch.

She was confused and still a little ashamed, both from sucking on her own aunt’s underwear and some of the things... and people she had thought of while doing so. Slowly, weakly, she made her way to a wobbly stand, and half-heartedly washed her face. The smell of sex still covered her, but it didn’t own her mind like it had before.

The sensation of putting her jeans back on was almost too much. Her very skin felt like a pleasure center, and as the rough material slid up into place against her pussy, she shook with another, thankfully weaker orgasm. Still, her eyes locked onto their reflection as her hips wiggled with heat and she didn’t see herself; not as she was, at least. No, this panting, drooling slut had to be someone else.

The mirror did little to center her, and she let one hand creep back under the waistband of the pants before she ran out of the room. Stuffed in her pocket was the still-wet pair of Monica’s panties.

Human Trial, Preliminary Findings, Personal Notes — Day 2:

Normalcy, it would appear, is a transient state. While I was able to maintain a steady state of mind until roughly mid-afternoon, the appearance of my two new housemates seemed to trigger some kind of heavy mating response. The formula seems to rewire the brain to somehow skip past most thoughts of morality or ethics, as I seem to have nothing but eagerness to the idea of claiming one or both of them as my own.

Physical changes have begun, which comes as a surprise. None of the test subjects exhibited any sort of difference in physiology, leading me to believe there is a fundamental difference in the way humans process the compound.

The changes seem to follow the same theme as the mental adjustments, as they all seem geared to make me both more receptive to mating, and more apt to be the subject of it. My breasts have begun growing steadily, and the sensations that are even now emanating from my newly-sensitive nipples threaten to end this period of lucidity prematurely.

Additionally, my sex has fallen into a state of permanent arousal. I now have to change my clothing fairly frequently as I seem to be lubricating excessively. The scent of my... self seems to have an effect on others, as I noticed a pair of my discarded underpants were taken from the bathroom last night.

I’ve been rubbing my clit non-stop, even as I write... and I’ve been thinking about my little niece’s head bobbing between my thighs. My nephew is also near to my thoughts, as I can’t seem to stop visualizing him sucking on my growing tits while I ride him. It’s hard not to go there now and wake him up with my pussy sliding down his hard cock.

For research sake, I’ve prepared two doses of SS419b, the submissive side of the formula, which I will be administering today. Over the next week I will document the effect it has on the sex drive and compliancy of my two subjects. For now, I find my primal self further taking hold, and I will again lock myself in this room until it subsides.

Annie rolled over comfortably, taking a long deep breath with a contented smile. Reaching down, she grabbed the head of the hairbrush she had fucked herself with for most of the night and started sliding it slowly in and out of her. Moving so that her face could be right against the now dry panties on her pillow, she raised her naked ass up to the room and began using herself in earnest.

From the heavy thunk of the knock, she knew it to be her brother, Max. For a moment, backside and dripping pussy wiggling in the air, she considered just telling him to come in. Then all at once she came back to herself and quickly covered up. Hastily sliding the messy panties under her pillow, she feigned a tired voice and told him to come in.

He looked somewhat worried for a moment, but after stepping into the room and taking a breath, he felt much more relaxed.

“So, it’s nearly ten in the morning, and aunt Monica is still locked up in her lab. I mean, should we be worried? What if something happened to her?” He sat down on the edge of the bed.

Annie sat up, trying to cover her naked lower half with the blanket. “Well, you remember what mom said, I mean, Monica’s supposed to be this brilliant workaholic, right? Maybe she just forgot about us?” Annie thought about the drenched panties she had found, and she had the deliciously naughty idea that she knew exactly what her aunt was doing.

“Yeah, you’re probably right. I know, I’m dumb to worry...” he made to get up, but felt his sister’s hand on his shoulder.

“No, you’re not dumb... It’s sweet, really,” she said as she turned him to her. She had only meant to comfort him, but feeling the firm warmth of his muscular shoulder in her hand caused the heat to rise in her again. Without thinking, she pulled him to her and pressed her soft lips against his.

Fire rushed through Max’s body at his sister’s touch, and the scent of womanly need that filled the small guest room. When she kissed him though, it felt like lightning. His cock sprang up, hard and wanting. His mind filled with nothing more or less than the unrelenting idea of fucking his sister until they both couldn’t think anymore.

As his hand ran up her thin t-shirt, just before it reached he frantic rise and fall of her firm breasts, he stopped. “This... I... I’ll see you later!” Before he could say or do anything else, he ran from the room.

Falling onto the rumpled covers of his bed, his mind raced. He could still smell the now ever-present aroma of sex that permeated the house, and his brain was still cycling between disgust and absolute rapture at the very vivid images of his sister’s naked form running through it.

Boxers down in seconds, he grabbed his throbbing member and stroked it slowly at first. Part of him wanted to stop right there, take a cold shower, anything else. That part was being drowned out by the now obvious sounds of his sister fucking herself in the other room.

He heard the creak of the springs on her bed as she moved, and the gasps and moans served as a perfect backdrop for the fantasy in his mind. Soon, his hand was stroking quickly, racing to keep up with the speed of his sister’s cries. As she gave out one last throaty moan, his body tightened. Toes curling, he felt his hot seed spill against his toned stomach, and the only thing he could think about was his sister licking it up.

The happy rapping at the doors came as a surprise to both siblings, and they quickly got dressed and stepped out of their rooms. Shyly they eyed each other, but neither said a word as they sat down at the dining room table.

Breakfast was eggs and pancakes; delicious, though slightly burned. Still, after washing it down with some of the oddly bluish fruit juice Monica gave them, it was more than adequate. They both watched as their aunt hummed happily to herself as she cleaned up, her hips wiggling distractingly. For the first time, they also noticed she had a rather sizable chest as well, and even Annie found herself staring as Monica moved this way and that.

Pretty soon she sat down with them, and it looked almost like she was smirking as her breasts stuck out over the hard wood table. “Finish your drinks, it’s time for your assignments!” Monica chirped happily. They quickly downed the rest of their juice, and it seemed to almost buzz inside of them.

“Excellent! Now Annie, you stay here. I have a special job for you, but I want to get Max all set up with raking the leaves first.”

Annie had to giggle, and despite their awkwardness this morning, even mouthed the words “I told you so” to her chagrined brother before she tipped her chair back to wait.

Monica’s hand felt hot against his arm as she walked him out to her secluded yard. Even having cum not long before, he still found his cock was now rigid and full inside the leg of his jeans. Worse, as they stepped, his aunt’s wobbling tits would randomly bounce against his body. By the time they reached the rake, he was on fire.

“Ok, so as you can see, these leaves have made quite the mess. You’re going to be cleaning up each and every one,” she snuggled in close to him as she spoke, and he nodded slowly. He didn’t know why, but he found himself more than happy to just do anything the older woman said.

“A few things though... first, take off your shirt.”

He pulled it off quickly, smiling and waiting for her next order as she eyed his broad chest. His cock pressed against his pants, and he made no effort to hide it now. Everything, from the way she looked to the way she smelled just felt like sex to him, and he knew she wouldn’t mind that he was responding appropriately.

“Good... goood... Your sister and I are going to be working very hard inside too, and we’ll be able to see you. You want to look your best for the fertile young women, don’t you?” she said, her hand rubbing at his crotch outside of his pants. His breath sped up as he nodded.

It was becoming harder for her to think clearly, as the muscular young man waited obediently in front of her. She knew she could take him now... take both of them, but it wasn’t yet time. More data had to be collected, and there was more fun to be had.

She practically walked backwards as she made her way inside, staring blatantly at Max as he began to work. Stepping inside, she quickly slipped out of her pants and picked up her dripping panties. Annie froze as she watched her aunt come in completely bottomless, but her surprise only doubled as Monica tossed a bit of sopping wet cloth onto the table in front of her.

Annie’s heart raced as she breathed in the scent, and her eyes rolled back in her head when she recognized it for what it was. Still, even though her body was screaming for her to grab the garment and taste all of it, or even go for the source... she found she just sat there, waiting.

Face downcast and posture more submissive than perky now, she shuddered inside as she watched her aunt walk around the table to her. Her lips moistened and her tongue ran across them unconsciously as she watched the little lines of her aunt’s juices as they slid down between her thighs.

Soon she felt the soft caress of her aunt’s hands as they tipped back her head, and she moaned at the simple sensation of those perfect fingers against her. One hand stayed and softly stroked the back of her neck, and the other reached for the table and grabbed the deliciously wet panties.

They dripped as Monica brought them slowly above her, and Annie found herself regretting putting on clothing as the liquid was absorbed by the cloth. Then, as the panties were centered above her head, a few perfect droplets fell into her eager mouth.

Groping herself, she frantically shook as the most intense orgasm of her life roared through her. She fought to keep her mouth open as drip by drip her mind was washed away in sheer carnal need. Smiling, one hand now toying with her own engorged clit, Monica squeezed out the panties over her niece’s face.

As the young girl squeaked out another self-shattering climax, she felt her aunt’s leg swing over her body. Soon she felt the warm, wet press of Monica’s pussy slide down her belly as she settled onto her lap. The steady stream of ambrosial juices falling into her waiting mouth was stopped for a moment as Annie felt her shirt and bra being torn off of her.

Her eyes opened and she saw that Monica had stripped completely as well, and as her aunt leaned forward and pressed their lips together, she felt the warm pressure of another woman’s breasts against her own. Her saliva, even her sweat, everything about Monica smelled like sex and dominance to the young girl. Panting, feeling the twin hot points of her aunt’s massive tits making lazy lines up and down her much smaller set, she brought her hands up against the soft curves of the older woman’s backside.

Monica knew the girl’s pussy must be on fire by now, but she didn’t care. The young woman under her was nothing more than a sex toy for her, and she used her as such. Grinding her sensitive sex against Annie’s body, Monica reached up and tweaked the girl’s puffy little nipple. Monica held her clit against Annie’s twitching belly as she kissed the girl again, delighting in the taste of her sweet youth.

“Who do you belong to, girl?” she demanded, pulling at Annie’s tight braid.

Despite the fire roaring through her body, her answer was quick and without reservation. “You, Monica! I belong to you!”

As a treat, Monica reached down and wetted two of her fingers in the mess she was making on the poor girl. She waved the fingers under Annie’s nose, smiling as she felt the girl shiver and shudder between her legs.

“You may have this, and taste me once you’ve managed to pleasure me. Now do so.”

The sex-crazed girl needed no further prompt, and her dexterous hands quickly slipped between her aunt’s burning thighs. Arms braced against the high back of the chair, Monica rode the girl’s fingers, panting and moaning much as her niece had not moments ago. While she had planned to prolong the experience, she found it didn’t take long before she was clenching her legs around the teenager’s body, riding her messily as she grasped at her own tits.

As she shook, she slipped her two wet fingers into Annie’s mouth, and the girl’s movements swiftly matched her own. Simply from the sensation of her niece’s sweet mouth sucking at her fingers she felt a stronger climax rise within her, and they both came screaming together.

Panting, but surprisingly still energized, Monica climbed off the now messy girl. Annie absentmindedly rubbed her aunt’s juices all over her firm belly and meager breasts, all the while mumbling “I belong to you...” again and again. Little droplets followed as Monica walked over to the kitchen window and her body responded quickly as she saw Max doing exactly as she had expected him to do.

“Girl, get over here, I want to enjoy this. And clean up the mess on the way,” she demanded, pointing at the tiny pools that led through the kitchen and between her legs. Wordlessly, Annie fell to her hands and knees. Her body shook and she gave out a whimper every time her tongue reached one of the delicious puddles. As her mouth began kissing and licking up her aunt’s toned thighs, though, she felt a hand on her head pushing her back.

“No... not yet. Look,” Monica said, pointing out to Max in the yard. Annie’s hands found their way in between her legs once more as she took in the sight that awaited her.

Sitting on a stump out near the edge of the grass, Max was sitting back with his pants down. Taking his aunt’s words to heart, he was plainly facing the window as his hand moved up and down his thick shaft. The light autumn breeze caused his wavy hair to whip slightly against his face, but it also served to gently tease the sensitive skin of his cock as he played.

Though it was fairly far, he could almost imagine he could see his aunt and sister watching him from the kitchen, and it only caused his already hard member to become even more rigid with need. Like this morning, his sister matched his pace, and Monica smiled down at the teenager’s open display of lust.

“You want to taste me more, pet?” she said fondly, as she ran her fingers through the girl’s soft hair.

“Yes... oh god, yes,” Annie panted under her, eyes swapping back and forth between Monica’s glistening pussy and her brother’s thick girth.

“Good, good... tomorrow you may, if you’re good. Tonight though, I have other plans for you,” Monica muttered, as both girls watched as Max’s cock began to spurt out over his hand.

Later that night, Max got to settle in in front of the big TV again. Dinner had been an awkward affair, and he spent most of it trying to hide the bulge in his pants. As soon as the food was served, his sister had sat down in his aunt’s lap, nestled up against her huge tits. At first he kind of freaked out about it, but as soon as Monica said that it was okay, and not to worry he was fine with it.

It didn’t stop his body’s reaction to the scene though, and the combination of the two girls perpetually nuzzling at each other and that ever-present scent of sheer sex had made it almost painful to stay in his jeans.

Thankfully, the two of them soon went giggling off to go shower together, and Max was able to take off his pants and relax a bit on the couch. Like the night before, he naturally gravitated toward some of the more risqué shows, but was surprised to find his aunt had also sprung for the actual porn channels as well.

The head of his cock had long since slipped out of the opening in the front of his boxers, and he was even a little amazed at how big it seemed in his hands. Still, the lust in his body was insistent, and he focused instead on the two girls licking each other on the screen in front of him.

He hadn’t remembered ever getting into a porno like he did with this one, and he swore he could almost smell the two girls as they went down on each other. He was so caught up he hadn’t noticed as Annie stepped into the room wearing only a thin white t-shirt and a tiny pink thong.

When she sat down next to him, he opened his eyes and panicked. Hastily he tried to stuff his thick member back into his underpants, while also trying desperately to change the channel on the TV. All that stopped though when Annie just smiled, reached over and started slowly running her hand up and down his shaft.

He froze, looking around almost crazily for anyone watching. With her other hand, Annie just quietly shushed him before reaching down between her own legs and teasing her clit. Her eyes were locked on the TV as she played, but Max was just staring at the wet lips of her pussy that she exposed with her rubbing fingers.

“Hold on a second, bro,” she whispered as she stood up and stripped completely. Max’s eyes wandered up and down her lightly tanned body, and he marveled at the jiggling heft of her breasts. Like his cock, he hadn’t remembered her tits being so big; not that he was complaining.

She sat back down on the couch closer to him this time, and with a grin she leaned into him and spread one leg over the arm of the couch. Her hair smelled like strawberries and woman as she snuggled up next to him, and he realized her face was mere inches from the bulging head of his member.

She reached down between her legs and when she brought her hand back up against his length it was slick with her juices. Wet as it became, he could now feel her breath more than ever as it blew hotly against him. Despite the sensations she was inflicting on him, she managed to keep him from finishing completely. Every time she felt his muscles clench behind her head, or his cock begin to twitch in her hand, she let go completely.

The most recent time she rolled over, and he could feel the soft weight of her tits against his leg as she stared down his dick. “Do you want me, bro? Do you want to fuck your twin sister’s tight little pussy?” she said playfully as she poked at his rigid girth. One hand she snaked down under her and he could hear the soft squish of her fingers against her lower lips.

“Oh god yes... I want you so bad, Annie...” he nearly growled, wanting nothing more than to grab her and pull her on top of him. Still, something held him back. Something inside him knew he wasn’t supposed to be the dominant force here, and he just leaned back and let her tease him.

“Maybe you don’t want my pussy? Maybe you want little sissy’s asshole, huh bro?” as she spoke she rose up her hind end, and he watched as she brought her petite hands around the soft curve of her ass to give them a little squeeze.

He nodded vigorously, but again found that he couldn’t act on his needs. Slowly, sensually she slid to the floor, her sweet, pretty face obscured slightly by the thickness of his member. Her hands encircled it and she brought her little pink lips up until they were almost touching him. As such, every word she then spoke sent little shivers up his spine.

“Oh, I know what big brother wants...” she said, letting a bit of her saliva drip down over the head of his cock. “You want to fuck your own slutty little sister right in her slutty little mouth, don’t you?”

As she spoke, she started stroking him faster and more firmly than before, and as he looked down at her soft baby blue eyes, he felt his climax burst forth. She leaned back, aiming his cock between her large breasts, and she held them together so his seed could pool there. Without any preamble, she stood up and walked out of the room, still cradling her cum-soaked tits in her hands.

“What the fuck?” Max mumbled, both at his sister’s insane behavior, and his still rock hard member.

Human Trial, Preliminary Findings, Personal Notes — Day 3:

The addition of two new test subjects has accelerated the rate of data acquisition. The lesser female has proven particularly helpful, both in terms of collecting samples and in keeping my growing urges in check. I find that her rapidly growing skill in sexual pleasure has served to keep my focus more on the monumental task of collating my findings.

That being said, despite the obvious success of the program, I have decided to proceed on my own with it. I have surrendered the necessary amount of paperwork and altered samples so that others will be unlikely to seek me out or continue the project. Additionally, I have an ample supply of SS419b to work with, refine, and distribute.

While her technique is of course becoming more exquisite, I’m finding the lesser female to be insufficient to my needs, and the thought of adding others to aid her in her work has been compelling to say the least.

The young male has not yet been shown the pleasure of service yet, as there is a certain enjoyment to be had from prolonging the experience. I have watched and rewatched the video I captured of the lesser female’s first sample collection, and I must admit I am looking forward to claiming the male completely.

It was easier than expected to ensure that the lesser female wouldn’t intrude on my mate. Despite her more primal mindset and seemingly lower intelligence, her loyalty and subservience to me are without question. That being said, the silly thing couldn’t keep her hands off herself when she got back, and I find I’m rather angry at her for her presumption. I’ve since punished her, and I cannot help but smile as I watch her sulk and dribble as she kneels next to me on the floor.

Physical alterations have progressed along as expected, with a few unforeseen but miraculous side effects. While all changes are still obviously geared at making the subject more capable, willing and desirable for mating, I hadn’t expected anything of this magnitude.

To the point, I find I am becoming younger. Aches and pains have begun fading away with regularity. This has been a great relief, truly, as my growing breasts had become quite a strain on my back. Upon deep analysis and observation, I find that not only is my physical age now somewhere around twenty-five or so, I am in better shape and far more flexible than I ever remember being. This formula could be something far more than any of us expected.

While my breasts have grown, they seemed to have stopped at a generally healthy and desirable size, leaving me with a great amount of agility still available without sacrificing physical display. That being said, the changes to the lesser female seem to disregard any need for her to be anything other than a sexual creature.

It is with no small amount of rather surprising satisfaction that I watch as the younger woman progresses into nothing more than a thing of pleasure for me. Her breasts have grown exponentially, and their sensitivity has increased almost tenfold. Her sex is much the same in terms of receptiveness, and her state of lubrication is nearly perpetual now.

The male has received changes of his own. General penis size has increased, though thankfully not beyond reasonable levels. Judging by the marking observed on his bed sheets as compared to the pool of seed now resting on his sister’s chest, I have to also say there is a noticeable increase in sperm count. This is expected.

Muscularity has increased as well, and what began as a fit young man has become the very model of masculine physical perfection. The sight of him drives the lesser female into a frenzy, and part of her punishment has been to watch the captured video without any type of sexual relief.

Watching the jiggling young thing has brought on another episode, and I will prepare further notes after having the little bitch satisfy my needs.

Monica stared down at the panting young girl with a mix of disdain and lust. Annie’s now massive tits were still soaked in her brother’s cum and her lust-dimmed eyes flicked between the mess and her aunt’s glistening pussy.

“P... please...” she managed to stammer out. Kneeling, she held the jiggling flesh of her breasts up in supplication to her mistress, knowing that with a touch, a word, she could feel sweet release.

Turning her chair, Monica rested her foot on the quivering girl’s shoulder, her legs spread and enticing. Annie looked up hopefully, her eyes now fully locked on her aunt’s dripping lips and prominent clit.

“Hmmm, I don’t know. I still think you enjoyed your assignment a little too much...” As Monica spoke, she slid a hand down past her large, firm breasts, down her perfectly firm belly and between her thighs. Raising her other leg so that both now rested on her niece, she started stroking her sex teasingly.

Annie tried to shake her head, but Monica just continued on, unabated. “I saw how much you wanted to have him take you. I saw how you looked at his cock like you wanted it to be yours. Let me tell you now... his body, like yours, belongs only to me. Do you understand?”

Annie nodded vigorously, trying as hard as she could to seem entirely sincere. Monica seemed somewhat placated, and the young girl felt herself being pulled forward by her aunt’s legs. As she neared the chair, Monica grabbed her hair and tugged her the rest of the way, until her chin was resting on the wet seat not inches from her aunt’s pussy.

“This is your world now, pet. As long as I’m around, no male is going to choose a dumb slut like you. That sloppy little cunt of yours will just have to make a mess on the carpet, unused while you watch me fuck any man you might want. And maybe, just maybe if you prove to be a good enough fuck toy, I might let you lick my body clean when I’m done.”

The thought of slowly lapping a man’s seed from her aunt’s perfect pussy was almost enough to trigger an explosive, moaning climax, but she just barely held off. Still, her already obscenely blatant nipples seemed to push out even more, and her breasts felt heavier in her hands.

Her old self was nearly completely washed away, and her only fervent wish was to become a perfect mate for her demanding mistress. Even her body seemed to want the same thing, and she smiled deep down as she felt her once toned and petite body become a jiggling caricature of womanly lust.

She felt the musky heat of her aunt’s sex as Monica leaned back in the desk chair. Delicious rivulets of ambrosia slipped down between the soft flesh of her ass. Annie felt her mouth fill with saliva, as she readied herself for her mistress’s service.

“In fact, today you’re not worthy of my pussy. That’s going to be pleasured by your brother later... Your task is to get me off in a manner more fitting of your position.” Monica said, her legs spreading wider and her feet moving to balance on the edge of the desk.

Annie was more than grateful her aunt had allowed her to be used in such a way, and she rushed to get her mouth into position. She inhaled deeply at the strong scent of Monica’s sex, and being so close to her purpose almost made her head swim. Happily, hungrily she reached out her increasingly agile tongue and began licking deliberate circles around her mistress’s ass.

Monica moaned deeply, her fingers still sliding along the sensitive surface of her clit. As her body hummed from the attention, she had to admit to herself that the little bitch did have her uses.

“You’re surprisingly not entirely worthless...” Monica said breathily, gently kicking the girl back from her. Orgasms for her had turned from a thunderous, mind-shattering ordeal into a slow creeping sense of power, control and even deeper need. Annie fell back on her curvy ass, and she cried out pleasurably from the sensation.

She was overjoyed at the compliment, licking her lips and looking up adoringly at her aunt.

“Tell you what, since you were such an obedient little ass-licker, you get a treat,” Monica said, nearly sneering as she spoke. For her part, Annie just bounced around on her hands and knees, looking like nothing more than a dog waiting for the ball to be thrown. Monica’s smile just spread more so, and she pointed over to the corner of the room.

“Use that,” she said, indicating an old wooden broom with a smooth, worn-down handle. “My ass got to feel good because of a dirty, brainless tool... Now you have permission to do the same.”

“Th-thank you, mistress,” Annie happily mumbled as she crawled over to the broom. It slipped easily inside her tight little bottom, and she braced it against the wall so she could still gaze lovingly at her aunt while she fucked herself. As her thrusts quickly became more vigorous, her tits bulged further, and her thick, sensitive nipples nearly grazed the sticky floor.

Monica had already gone back to work, and ceased to even register that the girl was in the room. Still, Annie was on her mind somewhat, though not as a lover or even plaything. As Monica wrote out calculations for alterations of the formula, she was thinking of her niece as a test subject.

Max sat on the couch, vigorously pumping at his cock. Since his sister had gotten him off he’d been practically locked in place in an unending cycle of stroking himself again and again with fantasies of her and their aunt having their way with him.

The couch was a mess, as was the floor in front of him. Thankfully, after the first hour or so his staying power had seemed to increase greatly, and now as he approached the three-hour mark of his latest session, he felt his heavy balls begin to tense again. That’s when he heard it: a soft sort of padding along the floor.

She came around the couch slowly, her huge tits wobbling beneath her, and each movement seemed to illicit a gasp or a moan. Face coated in sticky juices, his sister was hardly recognizable. Her body, once the athletic form of a gymnast or volleyball player, was now a voluptuous playground of exaggerated proportions.

Her mouth hung open as she moved, and her eyes seemed drained of everything but sheer animal lust. Her breasts were almost inhumanly large, the long thick nipples giving them a semblance of udders more than anything, and her dim expression only helped to further the impression. Her ass was round and perfect, and even from where he was sitting Max could see she had some sort of toy shoved inside of it.

As soon as she came in, she stayed on all fours between the couch and the TV. She glanced briefly over at Max, her backside nearly wagging in place as she stared at his rigid cock. He hadn’t stopped stroking as she came in, and his need only became worse as he stared at his sister’s naked body.

There was a sound behind them, and Annie’s head drooped submissively as Monica strode into the room. The changes had completely rejuvenated her, and she now looked almost like Annie’s younger, less slutty sister. In fact, as his aunt got closer and he could see and smell her more clearly, his sister started to look less and less desirable.

Annie had started whimpering pathetically as she saw Max turn away from her in disinterest, but she brightened considerably when she felt her aunt sit down on her prone form. The warm wetness of Monica’s pussy touching her back sent happy little shivers through her body, and though it was hard keeping up both her own weight and that of her mistress, Annie was happy to be used.

Monica sat for a moment and regarded her nephew, who was still mindlessly stroking his cock at the blatant display of skin in front of him. As soon as his aunt had entered the room, despite being filled with an even more urgent need than before, his climax had pulled back in waiting for his mistress’s word. After a moment of taking in the sight of her first male keeping himself prepared for her, Monica beckoned him forward with a smile.

Annie’s arms ached as she felt her aunt lay back on her, but when the little dribble of Monica’s juices slid down across her backside she knew she would do anything not to waste this experience.

Legs spread and waiting, Monica’s pussy seemed like paradise, purpose to Max, and as he glanced shamefully at his sister’s messy sex right beneath it, he wondered how he had ever been blind enough to be turned on by it. Still, she made an apt footstool, and as the muscular young man slipped inside his mistress, they both enjoyed the way Annie wobbled with strain at every thrust.

Soon though, the young girl simply couldn’t keep up with the hard heavy pounding her brother was giving their mistress and her body threatened to give out. Thankfully, Monica noticed, and with a raised hand from her, Max ceased all movement.

“Oh, you poor, pathetic little pet... was being actually useful too much for you?” she said as she stepped up off the shaking girl. “Ugh... I don’t know what I expected.”

Looking scornfully down at her jiggling niece, Monica sighed. “You, boy. Go back over on the couch.” He quickly responded, his thick cock still rock hard and coated in his aunt’s arousal. As soon as he sat down she nearly pounced him. Straddling his strong body, she eased herself down on his incredible member, feeling the rightness that came from claiming her property.

As she rode him, her fingers grasped his shaggy hair and pulled his head to her chest. Immediately he began to suck on her nipple, and the sensation of his quick tongue and eager mouth were quickly driving her crazy.

“You, slut. Here,” Monica pointed at her bouncing ass as it slammed up and down on Max’s lap. Annie looked up from the puddle of the boy’s cum she had been sneakily licking up off the floor and gleefully bounded over behind her mistress. It was difficult trying to lick the beautiful woman adequately as she moved frantically along the massive cock under her, but Annie knew she’d try.

Between a cock that had grown and shaped itself specifically to be perfect for her, and a tongue that had become purely a pleasure object, Monica found herself quickly scratching down Max’s broad chest as she cried out in sheer ecstasy. As she collapsed against him, she felt the boy’s strong arms encircle her as his seed pumped deep inside her.

Resting against the warm, sweat-sheened muscles of her new favorite toy, Monica was so relaxed and happy that she didn’t even berate or humiliate the lesser female as she quickly lapped at any of her brother’s seed that managed to dribble out. As she rolled off the boy and onto the center of the couch, she didn’t even push the girl’s head back as she started diligently cleaning her mistress.

Instead, she simply petted her soft hair and appreciated for a moment the absolute subservience of the little living fuckdoll in front of her. Meanwhile, Max had already began stroking at his still-hard cock as he stared raptly at his aunt’s pussy being licked, and it was all he could do not to shove his sister out of the way and attempt to please the mistress again.

“Tell me, you two... do you remember your mother?” she mused as her hand slipped into Max’s lap and she started stroking him herself.

Annie raised her sticky face out from between Monica’s legs. “I do, mistress.”

“Good... good... And you want this cock, don’t you? You want this male to fuck you until you can’t even walk anymore, don’t you?” Monica said, speeding her stroking and watching as the young man’s breath quickened. Annie watched raptly, her glistening lips open and her tongue wriggling inside her mouth as if she were imagining going down on her brother.

“I’ll take that as a yes. Well, while it’s likely beyond the understanding of you two... I need more test subjects. Additionally, I need to test some of the boundaries of your obedience to me, and I know the perfect way to fulfill both those needs. You two are going to turn your mother into one of my little pets, just like you.”

As she spoke, she pulled Annie over between her brother’s legs. The girl stared at her brother’s cock impatiently, like a dog waiting for a treat.

“Will you turn your mother into a pathetic, drooling little slut like you?” Monica asked, running her hands playfully now along Max’s throbbing length. The boy was beyond thought at this point and simply leaned back and took it all in. Annie’s response was an immediate nod, though Monica saw a trace of worry or regret there... She wasn’t concerned.

“Very well. Once is all you get. Mouth only. The full thing will come when you’ve proven yourself worthy of it.” Letting go of Max’s cock, she gave a dismissive gesture at it and walked out of the room to prepare. “Oh, and clean up afterward,” she called from down the hall.

He looked dismissively down at the girl as she reverently took his member into her drooling mouth. Despite her blatant sexuality and the constant smell of sex that rose from her, he couldn’t help but feel she was a shoddy knockoff of his perfect mistress. Still, as she bobbed noisily up and down on his length, he had to admit his sister at least had enthusiasm.

As she felt him twitch and tighten in her mouth, she wanted to slow down and savor things. Instead, she found herself speeding up, and as the first hot spurts touched her tongue, her eyes rolled back in her head. It didn’t take long for the virile boy to fill her mouth, and she moaned in an orgasm of her own as she took gulp after delicious gulp.

Once they tapered off, she leaned back happily, squeezing her thick, sensitive nipples and for a moment indulging the daydream that he was about to sate the unending fire in her sex. It didn’t last long... the girl well knew her place now, and she swiftly got to work lapping up the mess the three had created on the couch and floor while her brother finally passed out from exhaustion.

Human Trial, Preliminary Findings, Personal Notes — Final Thoughts:

I will admit, when I became a scientist I thought I had found my calling. While it is true I have no small skill when it comes to chemistry and its applications, I find I am now better suited to something far more important. Domination.

SS419 has shown me the way, and as I prepare the most recent vat of the compound for mass production, I am filled with the thrill of purpose. I had simply never realized how many people there were out there just waiting to be converted, to be made mine. Each one walks around acting as though they weren’t created to be mine... but I have the means to show them.

The submissive side of the formula is a fine first step, but considering the extent of the lesser female’s physical changes I believe I can go further. Why stop at busty harlots when I have the entire canvas of human physiology to toy with? Indeed, with the promising nature of the most recent tests, I believe I soon won’t even be limited to the realm of homo sapiens.

On the subject of physical changes, those in regards to my two little pets have tapered off completely. This is actually rather fortuitous, as their return to their mother is going to be rather hard to explain as it is. I’ve managed to tone down some of the lesser female’s impulses for now, and I believe that with a thick sweater and some coaching, we can pass her off for what she was.

Or not. It truly matters little in the long run, though I will admit I rather like the idea of their mother very slowly realizing what her children have become... just in time for her to take her place among them.

The heat is rising again, though I must focus at this critical time. Though my house is secluded, I have five families near enough where they could prove useful test subjects themselves. I have so many variations to test... I wonder, will they be enough?