Accidental Test Subject (Closed for The_J0k3R)

[Cherrybomb400]

Sadie had spent that last few hours after school tutoring a few classmates. One boy in particular was giving her trouble. Unfocused and constantly undermining her intelligence, questioning if her methods were truly the correct ones. It was infuriating. And then there was the creepy touching. The boy kept playing with her hair and the looks he gave her made her stomach churn.

Her long golden blond hair was down but usually tied with a thin pink ribbon. Her hair stopped right at her hip. Her mother always tried to encourage her to cut it short, but she preferred it long. Thanks to that boy now, her normal ribbon was gone. Said he would return it when he got an A on his next test. God that shit was cocky.

Upon entering her house, the first thing that she noticed was the smell. Someone had been baking! Not just anything, but she smelled chocolate chips. Wasn't their parents gone for the week? After dropping off her bag she went into the kitchen, but found that there were no cookies. Not even any dirty pans! She narrowed her eyes.

Her brother must have made some and then tried to clean up the evidence. She hadn't forgotten the last time she made cheesecake, nearly half of it went missing! and that was for her class party. Well, if the cookies were still here, there was no way she was going to pass at least having one.

After confirming that the much sought after cookies were not within the kitchen, there was only one other place to look. She headed upstairs and to a room she knew fairly well. Upon opening her brother's bedroom door, the scent of cookies was even heavier. They were definitely in here! She searched a bit... found a few magazines she knew she probably shouldn't have found.

Soon she found what she was looking for! Taking the cellophane wrap off of the plate of golden chocolate chip cookies, Sadie picked one up from the plate and bit into it.... It was delicious! The taste was incredible and she could hardly believe that these were made by her own brother.

 

[The_J0k3R]

Tommy had spent the last several months secretly researching the most potent aphrodisiacs and sex-drugs in the world, analyzing them from a chemical and neurological standpoint, and he was pretty sure, now, he had created the perfect sex drug. Something to subtly heighten pleasure, desire, libido, sexual thoughts.

Of course, it was a major ethical violation, but he needed to know how if it really worked. He knew it would, but an experiment was in order. The university chemistry lab was having its end of the school-year party tomorrow, and he had volunteered to bring cookies.

Those cookies were laced with carefully measured doses of his drug. He had tried one for himself, of course. And while he was, normally, a horny, pervy bastard, he felt all of those desires heightened and pushed to the forefront of his mind, and his cock easily roused to its huge stiffness.

He was in the shower, cleaning up after his day, and rubbing one out. He’d already masturbated three times since trying it, and every orgasm he’d enjoyed had been mind-blowing. What’s more, the amount of cum that he’d released with each orgasm had been significantly more than the typical amount!

He got out of the shower, dried himself off, wrapped the towel around his waist. It made an obvious and obscene tent at his his crotch, but he had assumed he was home alone, as he hadn’t heard his sister come in.

But he did see her in his room, helping herself to his cookies!

“Fuck! Sadie, no! Those are for the lab party tomorrow! Fuck!”

His mind boggled. How many had she eaten? If just one had done this to him… “Jesus, fuck, Sadie, how many did you have?” he demanded, stalking across the room to her and snatching the plate away, an action that caused his towel to fall right off his hips, the only thing holding it up now being his massive erection!

 

[Cherrybomb400]

"Oh calm down!" She snapped at him. "It's your own fault for not making any for your little sis." She stuck her tongue out at him.

When he asked her how many cookies she had, she shrugged. "I dunno... 3... maybe 5?" She didn't understand why he was getting so worked up. He grabbed the plate, but Sadie's eyes where on the only thing that was now holding up his towel. Her eyes couldn't leave the sight of it.

Suddenly it started to feel rather warm. Sadie didn't realize it, but her nipples were so hard, they were poking through her shirt. Without really thinking, Sadie reached forward and pulled off the towel, which was very out of character for her. Normally Sadie didn't appreciate seeing her brother nude in any fashion but now she had this need to see him naked.

The drug was taking a very quick effect. Not only were her nipples hard but her panties were soaked and beneath her she was already wetting her brother's covers. Sadie couldn't help it, she was grinding against her brother's mattress, right in front of him as he stood naked!

 

[The_J0k3R]

Tommy’s mind boggled when she told him she had had so many. And then he watched with a scientific curiosity as she pulled off his towel and practically started drooling at his cock, her hips grinding herself on his bed. He could smell her arousal filling the room.

Her nipples were obviously hard, her large breasts heaving under her thin shirt.

“What’s wrong, Sadie? You look flushed,” he said with a smirk, his mind racing. He immediately realized he was going to have to babysit her for the rest of the night.

And it didn’t matter that she was his little sister. She was hot, and his cock was hard. He knew he shouldn’t fuck her… but all he wanted to do was take advantage of this situation.

 

[Cherrybomb400]

"I.... I...." Sadie couldn't find the words, she was still humping against his mattress, her breathing heavy as she started doing it a bit more deliberately. Putting down one leg on the floor she was grinding on the side of the mattress, moaning as her eyes glazed over. She didn't care if she was doing this on her brothers bed with him watching... if anything, him watching was making her hotter! One of her hands reached up and started groping at her breasts. Her body shuddered at the sensation.

What was wrong with her? Why was she acting this way?! Her eyes also never left Tommy's cock. This needed to stop. Young ladies didn't act this way and certainly not in front of their brothers.

... But she couldn't stop.

Sadie then laid back on Tommy's bed and spread her legs open, making her soaked panties visible. Her hands yanked open her shirt. It was then she realized that it seemed like her breasts became even bigger! She grasped her nipple and started to lightly pinch and pull at them until she was crying out loud from how sensitive her breasts were.

 

[The_J0k3R]

Tommy stood over her as she lay back and exposed herself to him, and he started slowly stroking his cock above her. She was useless when it came to words, so he would have to take copious notes of her behavior… afterwards.

He wasn’t going to miss a second of this show!

“You’re so horny, you can’t control it, it’s taking over your body isn’t it?” I said to her, jerking my cock. The immediate sexual meltdown she was experiencing bode well for my research, confirming that the small dose was strong, and that an overly large dose was… well, very interesting!

 

[Cherrybomb400]

"Ahhhh!" Sadie cried out as she twisted her nipple, shuddering as a small orgasm ran through her. She still hadn't made it to the main course. She pushed up her skirt and her hand slipped into her sopping wet panties. Wet squishy sounds were heard as she played with her swollen clit. If she was wet before, she was dripping through her panties now!

Her hips bucked as her voice started to get higher and higher. She was fucking her own pussy with two fingers, something she had never done before. Looking at her right there, no one would have guessed she was in fact a virgin. Her hand was fucking herself so hard, her hand slapped against her sex.

"C-cum..." She gasped as she kept watching her brother stroking himself. "Cum... on.... me!" her head rolled back as the hardest orgasm she ever felt ripped right through her. Her pussy clamped on her fingers and a gush of her girl cum came pouring out.

 

[The_J0k3R]

Tommy’s eyes went wide as he watched her cunt gush out onto his bed, making a huge mess. He smirked. He was still just slowly stroking himself. Not even close to ready to cum, even as she lay below him, cumming herself and begging him for it.

He had never seen anything quite like her display, even in his favorite porno movies. That’s when he noticed that her tits seemed to have gotten larger. Not that he was incredibly familiar with her bared tits, but he had checked her out more times than he cared to recount, and the funbags jiggling on her chest were significantly more than the small handful she typically sported.

Jesus, what had he done?

What had he created?

“If you want my cum you’re gonna have to suck it out of me.”

 

[Cherrybomb400]

He didn't need to say anything more. Sadie managed to pull herself from the bed, her pussy still dripping on the floor as she knelt in front of him. Grasping a hold of his cock, she guided it to her hungry mouth. She wasted no time. She was sucking on his cock with such vigor! Her tongue was dancing along his length and she moaned at the taste of him. She couldn't get enough.

At first she was only taking half of his member, but soon this little nympho's mouth and throat was taking ALL of him. She moaned, begging for his cum to coat her slutty throat.

 

[The_J0k3R]

He had never experienced a woman so hungry for cock she practically jumped on it. He had never experienced such an aggressive blowjob before either. She was milking him with her mouth, doing everything she could to suck him to completion, and her

He lost it. His body overloaded on erotic experience and her sucking triggered exactly what she wanted. His balls roiled, his cock pulsed, shuddered, and he pulled it back just enough to get it out of her mouth, which hung open, tongue out. He grabbed it and jerked and his load spewed forth, hitting her right in the eye before he adjusted aim to coat her lips and tongue and shoot big gobs of cum right into her mouth…

 

[Cherrybomb400]

Sadie didn't care that her left eye was covered in cum. All she cared about was tasting his cum on her tongue. After she got as much as she could in her mouth she swallowed and then started cleaning up any remaining bits she might have missed. It was so delicious. She couldn't get enough! She wiped the cum off of her face and licked her fingers clean and then looked back up at her brother.

"More... More." She begged as she continued to stroke his cock which had already emptied him.

 

[The_J0k3R]

Tommy could hardly believe the words coming from his little sister, or her actions. His drug worked far better than he ever could have hoped! In a way, he was glad he hadn’t gotten the chance to serve the cookies at the party; it was obviously far stronger than he realized, and he probably would have gotten found out.

But Sadie was completely clueless.

“You’re gonna have to give me a bit to reload, Sadie,” he explained, running his fingers through her hair, practically petting her like he would a dog. “But how about another cookie?” he suggested, grabbing another one for himself.

This was going to be a very fun evening…

 

[Cherrybomb400]

Sadie pouted when she was told she had to wait. Her mind was seriously not in the right mind set. All she could think about was getting more cum or making herself cum. When she petted her head, she closed her eyes and nuzzled against his hand as she softly let out a "mmmmm" at the contact. Any touch he gave her just made her greedy with want.

"Will you touch me until you can make more?" She asked before she turned her head to his hand and licked the length of his finger before taking it in her mouth and sucked on it teasingly. What was meant to entice him actually just fueled her lust more.

Sensation EVERYWHERE was tripled. A normal light touch or caress was mind numbing, rendering her into a helpless sex kitten that couldn't get enough. Feeling his finger on her tongue gave her such a weird and strange pleasure, like he could finger her mouth and make her cum.

 

[The_J0k3R]

Tommy took his cookie and bit off a chunk as Sadie started sucking on his fingers. He watched with lusty eyes as he finished his cookie, and then slipped his fingers reluctantly from her mouth... only to bring another cookie up to her face and offer it to her.

He wondered if she would eat the cookie, or if her current state had her so sex-crazed she could think of nothing else.

"I'm gonna have to bake another batch of these for the chemistry lab party tomorrow," he said. "We already ate too many, so we should just enjoy these..."

He ran his fingers through her long blonde hair again, his eyes roaming over her body. Her schoolgirl blouse was wide open, her enlarged breasts threatening to burst out of a now-too-small bra. He knew her panties were soaked through with her pussy juices underneath her little plaid schoolgirl skirt. His gaze moved from her heaving chest back to her eyes as he held the cookie close to her mouth.

 

[Cherrybomb400]

Sadie opened her mouth for the cookie. She would have rathered his fingers or his cock to suck on but having the cookie on her mouth was a sensation all on its own. She she moaning as she chewed and swallowed it. Waves of pleasure were ripples through her as she got another dose of her brothers concoction.

There was a loud snap as Sadie's breasts were even bigger and broke her bra. Even her ass seemed to have gotten fuller and rounder. The poor girl could t see straight. She pushes Tommy down and climbed on top of him until she was sitting on his cock. Her soaked panties were warm and wet and there was an audible squishing sound as she humped against his cock.

Her large breasts were bumping and swaying all over the place. She grabbed Tommys hands and placed them on her large breasts. She started shuddering and though she hadn't cum yet, her pussy was gushing as she let out a loud moan, just from being fondled by her brother.

 

[The_J0k3R]

Tommy should have been terrified by the incredible sexual transformation taking place before his very eyes. He should have noted that his concoction, in addition to elevating arousal and desire, was causing major hormonal changes.

But he was too incredibly aroused at that moment to think straight. He did, however, notice a similar change in his own physiology: his cock, it seemed, had grown much larger as well! His cock stiffened at the sight of his sister's bra bursting apart, and then he found himself beneath her as she climbed atop him and straddled and humped her pussy on his throbbing member.

It felt so good, that wet heat gushing onto him, that only when he looked down at their connected crotches did he realize that his cock was much thicker and longer than it ever had been! What was going on? Was this a temporary side effect? Or would the effects be permanent?

He grasped Sadie's heaving, heavy tits with both hands, squeezing and kneading the abundant flesh with abandon, even raising his face to them to suckle at the nipples, each in turn.

He pulled his head back and squeezed both breasts firmly above him, and to his complete surprise and shock, milk burst forth from both nipples, spraying across his chest!

 

[Cherrybomb400]

"Jesus, YES!" Sadie cried out as she continued to hump her brother's enlarged member. She couldn't think clearly, her body was doing all the thinking for her and it seemed to know exactly what it was that it wanted.

Sadie almost came right there when her brother sucked on her nipples. When he stopped she briefly whimpered but them he started kneading and massaging her breasts. Then from her nipples streams of white started to shoot from her. She could only react shocked for a moment as the sensation of the milk bursting from her was just another stimulant and then she came with her pussy resting on her brother's cock.

A loud primal cry ripped through her as her body shuddered. Even after cumming and panting out of breath, her body still wasn't satisfied. Sadie pushed her panties to the side and grasped her brothers cock and guided it to her virgin slit. Sadie didn't even think twice, as soon as his head popped into her, she slammed all the way down, which elicited another loud cry. Any paid that might have been there was completely overshadowed by how receptive to pleasure her body was.

Sadie put her hands on her brothers shoulders and just started to thrust herself up and down on his thick shaft. She didn't care that she was fucking her brother, that she wasn't a virgin anymore. All she cared about was cumming again. She needed to cum and she didn't care who she fucked to feel that high of an orgasm.

 

[The_J0k3R]

Tommy grunted at the unexpected suddenness with which his sister pierced herself on his cock, taking his full, massive length inside her dripping cunt with ease, and started riding him like a woman possessed!

All he could do was hold on for the ride!

His hands grasped at her hips, her huge bouncing tits, his grip firm, trying to slow her to no avail. She needed cock in her, she was aggressively chasing her own pleasure, and there would be no stopping her!

The sensations began to overwhelm him. He felt his balls tighten, and his cock throb within her, as she bore down on him again and again, and within a moment, his seed was spewing forth inside her! Spraying her insides, coating her womb, his copious jizz filled her, but the effects of his cookies kept his cock rock-hard and he was able to immediately start thrusting up hard into her. Soon, his cum and hers was coating their crotches, legs, and bellies as they humped each other into exhaustion...

 

[Cherrybomb400]

The two were just a mass of gyrating flesh as they fucked each other silly. Feeling her brother cum set off her second orgasm but he wasn't going easy on her. His cock continued to drill up into her. Tightly she held onto Tommy, her fingernails digging into his skin as she struggled to meet his thrusts.

Everything was so hot, so wet. They couldn't stop! It seemed like hours, they just kept going, moving and feeling one another until finally Sadie blacked out. Her body gave 100 percent until all of her energy was depleted and she couldn't continue. With tired eyes they closed as she passed out ontop of her brother.

It wouldn't be until the next morning that she would find herself, her breasts decreased in size however they were much larger than they normally were. Sadie sat up, her head still dazed but she could tell that the room reeked of cum. When she realized where she was, that she was naked, and what happened she felt like she would stop breathing.

She fucked her older brother....

What. The. Fuck. Is wrong with her?!

She grabbed her things and quickly ran out of the room and to the bathroom. They didn't use any protection, what if she got pregnant? She turned in the shower and stepped in. God she was covered in cum and there was still a ton inside of her.

 

[The_J0k3R]

Their rutting had seemed to last forever, and endless loop of orgasm after orgasm for each of them. Tommy had no idea when they had finally passed out, and he only roused when she was leaving his bedroom in shock. He heard the shower turn on, and he looked down at his own naked body. He was a mess of cum and love juices, and the sheets were in even worse shape.


Slowly, his body sore, he rolled over and sat up. He looked down at his flaccid cock between his legs, and noticed that he was still significantly more well-endowed than he used to be!


He wondered if that particular side effect would be permanent, or short-lasting. He looked at the plate of magic cookies still sitting on his desk. He wasn’t sure if he wanted to eat another one at the moment. Alone with his sister, having tasted her sweet honey, would he be able to control himself?


God, his sister! Would she figure out what had happened? Should he tell her the truth? For the sake of science, should he continue to subject her unwittingly to his little experiment? Wasn’t that just completely unethical? He knew one thing, though, he now had little interest in attending the office Christmas party! He grabbed his smartphone and shot off an email to the organizers, claiming an illness so as not to attend.


He stood up and grabbed a towel. He needed a shower, badly. He idly wondered if Sadie would let him join her…


His cock immediately throbbed a bit at the prospect. Clearly there were some lingering effects from the cookies! He found himself moving for the door, naked, the towel draped over a shoulder, and he crossed the hall to the bathroom. The shower was still running. Should he knock? Or just barge in? He opted for a bit of both, knocking on the door and opening it a bit to stick his head in.


“Hey, how much longer you gonna be in there? I gotta get cleaned up!” The next words surprised even himself as they tumbled out of his mouth. “I know there’s room in there for two!”

 

[Cherrybomb400]

Sadie must have only been in the shower for five minutes before she heard her brother not only knock on the door but come right inside. Her body started shaking. She wasn't scared of him, she didn't think, but she still needed time to process everything that just happened!

“Hey, how much longer you gonna be in there? I gotta get cleaned up!”

"I just got in here, Tommy. Give me 20 minutes okay?" She asked, trying to put on the same amount of sass she normally would had they been fighting over the shower.

“I know there’s room in there for two!”

"No! Don't come in here!" She definitely could not handle him now. Not naked. Not in the shower. Wasn't he shocked or disgusted at all by what happened? What had happened? One moment she was sitting on his bed eating cookies and the next was a blurry until all she could remember was her climbing ontop of Tommy and then... sitting on his cock before they were fucking like wild animals.

Sadie was trying so hard to keep it together and keep herself from crying that she missed the sound of the shower curtain opening as she was facing the shower, letting the water hit her body as she was hugging herself tightly.

 

[The_J0k3R]

Tommy ignored her pleas, instead letting himself into the bathroom with her. He hung the towel on a hook and then grasped the curtain, opening it and seeing his curvy little sister hugging herself under the water. Was she crying? He couldn’t tell.


He stepped in, and reached out for her, his hand finding her hip before he gingerly moved towards her, giving her a moment before engulfing her in a hug from behind, pressing her naked body back into his.


“Shhh…” was all he said, a whisper in her ear.

 

[Cherrybomb400]

Sadie trembled when she felt her brother's hand on her hip. She expected him to force her to turn around and she was ready to refuse that... but then there was more warmth hitting her body that wasn't coming from the shower head. With his arms around her body she started to shrink into him, her back curling as her legs were ready to let her drop to the floor but Tommy's arms held her up.

It was like there was an emotional explosion that started within her chest and then it felt like her soul was caving in. That's when the last of her resolve disappeared and Sadie started crying.

She didn't understand what happened, why, or how. All she was left with were questions and the shame of not only losing herself, her virginity, but any morals she had. She was trying so hard not to cry that by doing that she just made herself want to cry harder. She didn't try to pull away from, her hands just found his arms and she held onto him, for dear life, for her sanity.

It was a while until she finally calmed down and by then she had managed to turn around and her chest was pressed against his, holding onto him as the water poured down. She still hadn't said anything. She didn't know what to say!

 

[The_J0k3R]

“Shhh, shhh,” Tommy soothed her, running his hands along her wet hair as he held her tight to his chest. The feel of her firm breasts against his skin was causing a particular, unavoidable reaction in his loins, but he ignored it.

“I don’t know what came over us yesterday,” he said, well aware it was a lie. “Maybe we were both just stressed and needed some relief…” he offered as a dubious explanation. How could he tell her he had drugged her? Inadvertently at first but then… fully aware of the consequences of his actions. He had enjoyed those consequences far more than he should have.

He kissed the top of her head and squeezed her tight, mashing her tits against his skin. “It’s okay,” he promised. His voice lowered.

“You were amazing…”

 

[Cherrybomb400]

Sadie continued to hold onto him as she cried which was starting to finally calm down. She just couldn't figure out why she acted so strangely, why they did what they did. Soon she was breathing calmly, still holding onto Tommy. She started to believe that he was right, that it was going to be ok.

When he commented her performance she didn't know how to respond. She just ignored it. She just wanted a few more minutes before the inevitable talk that they would need to have. Things could never be normal anymore even if they decided to never speak of it again. She would always remember it.

Sadie closed her eyes. Even though they just woke up, crying had made her tired once more. She just wanted to lay down.

"I'm sorry," she said quietly. From what she remembered she instigated the whole thing! She was in his room, started grinding his bed and touching herself... the rest was a little blurry. She remembered parts but not enough to piece that she wasn't at total fault.