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Double Dose [sinfulrook x missingsin]

missingsin

missingsin

Super-Earth
Joined
Jun 15, 2011
Location
neither here nor there
Julie was double-checking the data again, something must be skewed because the numbers don't add up. She unconsciously rubbed her nipples after peeking at her twin brother, who was busy checking data of his own. Seeing that he was busy, she rubbed them harder between her fingers, using both hands now. They just felt more sensitive than ever as she felt them pebble between her fingers. She stifled a moan, what was happening to her? She had stopped wearing bras because they didn't fit anymore and her breasts felt better unconstricted. Stopping the way her thoughts ran, she looked at the figures again. Maybe she missed something.

But she only found herself rubbing the end of her pen against her throbbing nubs. Her boyfriend Johnny had already complained about Julie wanting to have sex all the time. It wasn't like all the time, she still went to class and did her experiments for the lab dutifully. He also never complained when he made her put his tiny whiny cock between her breasts and tit-fuck it. Though she knew her twin and her boyfriend didn't quite like each other, Johnny was sweet in her own way. She just sometimes wished that he was bigger and could stay hard longer. She missed him already since he's going to be home for a few days for a family wedding. She just feels horny all the time as she rubbed her tits again. She has to damn stop this.

She removed the scunchy that tied her soft curly black hair, until the curly edges nestled just a little past her shoulders. Where was her calculator? She had removed her lab coat and was dressed simply in a white t-shirt, so tight against her breasts she knew her nubs would be showing. She was just about to open her a drawer when she espied it on the other desk.

Forgetting to wear her lab coat she stalked to where her brother was. "How many times have I told you to return stuff where you get them? I had been looking for the calculator for...like forever," she complained. Looking at his desk, "I told you so many time to throw your candy wrappers in the trash can and wash the coffee mugs after you use them."

"Why can't you do simple things like that all the time. I know you're older. By five minutes," she continued in a huff. "This is a laboratory, not a college dorm," she reminded him. They were both science majors though she planned to major in nanogenetics next year. She leaned closer to her brother and started gathering the stuff from his desk. "I'm always cleaning up after you," she said again. The tight shirt was really rubbing against her breasts and they were already too sensitive with the unconscious playing she had been doing earlier. "Damn, next time you clean up after yourself," she said crossly. Why was she so damn horny.

"I'm calling Johnny."
 
Leo was just sitting at a separate lab table, doing calculations over and over again, by hand, with the calculator, he even got up to do it on the computer, but it all just came up wrong no matter what. He was getting frustrated, and to make it worse, his twin sister was sitting right next to him. He didn't hate her, he loved her, like a brother should, but she always nagged him for the smallest and stupidest things, and he always had a reason to backfire at her, but she just overpowered him with all her stupidity. They were both majoring in science, but he was going into chemistry in general, wanting to work more with different elements to create new things, perhaps something to make people longer.

Recently, he injected Julie and himself with a specific formula that they came up with together, one for the female body, and the other for the male body. He didn't know how they would react to the doses, but he seemed to get hard just minutes after, and feeling really horny. As he kept crunching numbers on paper, he had the calculator in front of him, running a few numbers on it and then throwing pieces of paper in the trash, groaning in frustration. He secretly used one hand to rub his erection outside his pants. A large bulge was visible through his pants, but it was covered from the sides by his lab coat.

When his sister came over to him to grab the calculator, he heard her nagging again. He groaned and just tried to ignore her, but she just kept on going. "I was still using that calculator..." He said and tried to focus on his paperwork. "I know that, but I'm busy right now." He replied to her again when she nagged him about the candy wrappers and telling him it wasn't a college dorm.

"I get it, just let me do my work..." He said once she finished nagging him. He saw his sister's erect nipples through her shirt when she was picking things up, and so that made him even more horny. He rubbed his cock the entire time that she was near him. For some odd reason, he found his twin sister rather hot, with her big tits, and her big round ass. Then he heard the name that he despised so much.

"Why? I thought he was at a family wedding?" He asked her, stopping everything he was doing and turning to look at his sister. "Are you gonna go have phone sex with him or something? He's far too small to reach you this far." He said, laughing at his own joke, loudly. He knew that Johnny was small, since she always talked to him about how small he was and she wished he was bigger.
 
Julie gave her twin a smack and then laughed because that was so true. Johnny was so sweet and willing to use toys because his four inches and a half just couldn't do anything for her. She saw the pieces of paper that were littered on her brother's desk and realized it was for the same project.

"Hey, you also having some problems?" she asked as she sat on her brother's desk. Irritation forgotten, she looked at her brother and playfully ruffled his hair, mussing it up. Her nipples were driving her crazy and unconsciously, she rubbed them as she talked. "I also have the same problems. It's either they skewed the data or the results are unfinished," she said as she pinched a nipple really hard. The sensation brought her out of herself and she realized what she was doing.

She colored in embarrassment and then just wailed out. Leo was her twin and she could tell him anything. "I'm just so fucking horny all the time. Just look at these," she jutted her breasts at her brother. "The wind blows and they just get hard," then she took his hands and put it on her breasts. "And they are bigger and I don't know what's wrong! See?" she asked her brother as she pressed his hands on her breasts, moving them around so he could see how big and soft they were. So much bigger than before.

"I want to fuck so bad," she admitted as she started moving against the hands on her breasts. Leo's hands were so big and warm. Like his cock. She knew he was bigger than Johnny, they stayed in the same room after all. But she never looked at him they way she was looking now. She leaned over to whisper, "I bet your cock is bigger than Johnny's. Let me see."
 
Leo smiled when she laughed and nodded when she asked if he was having the same issues. "Yeah, I think they didn't finish the results..." He said and watched her as she played with her own nipples. He was able to control himself when she said she was horny and thrust her breasts at him. "Well it could be a side effect..." He said to her and then saw his sister take his hands and put them on her breasts.

They were so soft, he just couldn't hold himself back, so he massaged her breasts, blushing and looking up at her face, noticing she was blushing as well. "They did grow since our very first injection." He said with a slightly embarassed voice, groping and massaging his sister's breasts, enjoying just how bit and soft they were. "It's weird because I'm always hard now, and I'm horny constantly, I just feel like I need to fuck..." He said softly when she said she wanted to fuck.

When he heard her say she wanted to see his cock, he blushed more and let go of her breasts. "I guess there's no harm in just seeing it." He said with a grin and stood to his feet, standing in front of her and unzipping his pants. He pulled his pants down and his underwear as well, his thick, long, erect cock just popping out and throbbing, right in front of her eyes, his balls swollen as well. "Well, what do you think?" He asked with that same grin and took her hand, forcing her to wrap her fingers around it and stroke it a little bit.
 
His brother's hands on her breasts felt so good and Julie tried to stifle a moan. She was getting ot from what Leo was doing and she kept thinking of cocks and cum, more so when her brother stood and unzipped himself. Leo's cock was big and throbbing, so much bigger than her boyfriend's.

He made her wrap her fingers around it and she slowly pumped her hand along the shaft, the veins were red and throbbing and she could feel herself getting wet. "It's so big," she gushed as she leaned closer to take a better look - all from a scientific point of view. "So much bigger. It must be your experiment," she said as she opened her legs so she could be seated properly.

Her other hand was on her breasts and seeing Leo's cock, her nipples were throbbing and she just wanted...but this was her twin. Okay, they'll just play a little. No harm, no foul, she told told herself. Without thought, she pulled up her shirt and tugged her nipples. "See, mine are bigger too,X" then she leaned close and let her brother's engorged head rub her tits.

"Ahhh," she moaned out. That felt so good. Finally. She took off her shirt and looked at Leo, "My tits are just so sensitive."
 
Leo smiled when he saw her sit down, letting her do as she pleased with his new, enormous cock. "I know it's bigger, it was bigger even before the doses." He said with a grin and a wink, watching her undo her shirt and shove the head of his thick cock against her new, amazing tits.

"You're so much more bigger than you were normally..." He told her with a slight moan, the head of his cock really sensitive right now. It was wrong of them to do this, but it was all just a little bit of fun, it was harmless, right? That's what he told himself, and so he decided to do whatever she pleased, maybe do what he wanted as well.

"Then put this big piece of meat between those sensitive things, we'll see just how sensitive they really are." He said with a smirk and pushed his cock into her cleavage, watching as his cock just got devoured by her massive bust. "Wow, they are really big, just look at how you sucked my cock into them." He said with a smile and waited for her to rub them up and down.
 
Okay, even Leo was up for playing and well,Johnny wasn't around and this was her brother so it isn't cheating. Julie moaned as she Leo pushed his cock in between her tits. They felt so good as she mashed her breasts together to give them more friction.

"Auhn...why don't you fuck them," she said as she watched her twin's cock glide in and out of her cleavage. She pushed harder and moved, her breasts were so big she could move them up and down on her brother's throbbing shaft.

She leaned down to taste the pre-cum leaking out of the head, her tongue out and licking whenever Leo's cock came up. She looked at her brother, "Tug my nipples." Her hands were so full of her tits she could barely hold them together. She was so wet now, as she pumped Leo's cock hard with her tits.

It was quite a feeling, her softness and the cock's velvety hardness. She could feel the veins throbing as the cock slid in between and she kneaded her tits closer and harder, moaning. "That feels good Leo," she panted out.
 
Leo grinned at how big and how soft her breasts were, but the way she squeezed them together, with such pressure, he loved it. He thrusted his cock back and forth, sliding up and down between her tits, lots of precum oozing out of his cock. He loved the way she licked the tip each time he brought it up to her mouth, holding it there for a bit each time.

When Julie asked him to tug on her nipples, he grinned and nodded, pinching her nipples between his thumb and index fingers, pulling on them and teasing them. "Your nipples are so hard, Julie, do you love it when your brother plays with them?" He asked her quietly, moaning as she squeezed and kneaded her tits harder against his thrusting and throbbing cock.

"Ah fuck, Julie, you're gonna make me cum if you keep going like that." He warned her and kept thrusting his cock, pushing further so she could suck on a little bit more of his cock.
 
Leo was tugging at her nipples hard and each tug sent a throb in her clit. She was gonna come from just a little nipple play with her twin. She moaned out loud, in between lapping the copious cum leaking from Leo's cock. "Uhmm," as she sucked on the head as Leo pushed hard and stopped, letting her pink tongue lick the piss slit before using her lips to suck.

She let the cock head rest on her soft lips, while her tongue flicked all over the know, then Leo tugged so long and hard. "Mnmph.." she mewled with the knob still in her mouth then Leon sadly pulled away. "I love it, when you play with them. My older brother tit-fucking me is so hot," she moaned.

She let him him pump between her breasts, they were jiggling now and the nipples were red and engorged. "Why don't you cum all over them," she gasped out as the tingles n her clit became an insatiable throbbing. It felt so naughty but it felt so good. "You love my tits milking you like this? Fuck them harder bro, bathe me with your cum."
 
Leo continued to pump his cock forward and back between his twin sister's big tits. His fingers were still pulling and teasing her stiff nipples, actually feeling them throbbing now. "Oh don't worry, Julie, I will make sure to give you a nice reward for having such amazing tits." He told her with a grin and pinched her nipples more and harder.

After a short while of continuous thrusting between her tits, he pulled away, letting go of her nipples and holding his cock in his hand, stroking it a little and letting all his cum go, shooting it all over her big, luscious breasts. He shot so much cum, it was enough to cover her face and breasts, but luckily, it all got on her breasts.
 
Julie couldn't believe that Leo could make her nearly come from just tit-pulling as her twin tugged and pumped and made her a real tit-slut. She was so wet now, she knew her skirt will be damp because her panties were leaking. "Come on bro, cum on my tits," she moaned out as she spread her legs wide.

Then Leo was cumming all over her and she spread the cum all over her tits, like it was a tit cream and it felt so wicked. This was her brother and they were just playing, right. She licked the few gobs that flew to her face, but those in her tits, she spread all over. She even played with her nipples, they were so sticky and slick now.

She laid down on the desk, so turned on as she finally put her hand inside her panties. She didn't bother removing them, just pulled them aside as she smeared her pink pussy lips with her twin brother's cum. "I'm so horny Leo," she moaned.
 
Leo watched his twin sister Julie just rub and lick the cum, his cock still fully erect and throbbing, eager for more playing. When she layed down, he just looked at her, curious as to what she would do. When he saw her cum covered hand just enter her panties and rub her pussy lips, his mouth just dropped open a bit.

"Julie, I want you so bad..." He said and went over to her, kissing her lips softly and rubbing his cock against her pussy gently, not entering her just yet. He pulled away from the kissing and then stood up in front of her. "We can't do this here, we'll get caught." He warned her and looked around, then pulled his pants back up to his waist, his cock bulging through his pantleg now.

"Clean yourself up really fast, and grab your experiment, we're going back to our room." He told her, grabbing everything he needed, including his experiment. He was going to use that experiment some more on himself, to please his sister by cumming much more on her and inside her. "Hurry up."
 
She was so lost in lust that she almost let her brother fuck her in the lab. In the lab. Julie shook her head to clear her thoughts. Damn, she was covered in cum. She took some more in her mouth, she was turning into a cumslut. She shot Leo a dirty look, "Just what the hell was in that formula of yours. Viagra?" She cleaned herself up using her shirt.

She used her lab coat to cover herself, the shirt wasn't fit for anything as it was dripping and wet with so much cum, you could wring it out. She helped her brother clean the lab then she gathered her notes. They were out of the door and walked to their dorm as fast as they could. Leo was just opening their dorm room when her phone rang. Automatically, she answered.

"Oh..Johnny," she said pausing. "Hey baby.." she looked at her brother. She was horny for her brother's big cock.
 
As Leo opened the door he heard her phone go off and watched her answer as he slowly stepped inside with her. He put his finger to his lips vertically, telling her to be quiet without saying a word. He closed the door behind them and set his experiment down on his nightstand, waiting for her to finish talking.

He took out a piece of paper and began writing down something, waiting for her still. He held up the note to her. "My cum is just building up, you better hurry before I forget about what we did in the lab." Was what the note said. He grinned while looking at her speak to her boyfriend still. He was annoyed that he called her, and it was at such a bad time too, just when they were both horny and about to jump into a bed and fuck each other's brains out.
 
Julie wanted to put the phone down but Johnny was going on and on and she just wanted to fuck her twin brother. She took the note Leo had written and slowly rubbed it on his crotch, she kne w she was hard. Johnny was still on the phone and she made little noises but her eyes were on the pants she was unzipping. Her brother's cock sprung out hard and leaking and she kneeled down, looking up at her brother with a wicked smile.

She just had the lab coat and she unbuttoned while she cradled the phone between her chin and her shoulders. Then shrugging off her coat, she took Leo's cock in her hand and wiped her face with her leaking cum. "Hey Johnny, baby. I've got my hands full. Can you call later?"
 
Leo grinned and watched his twin sister rub it on his erection. He smiled and watched her rub herself with his excessive precum, loving how shiny her face and lips looked. He then heard her say she will call him later, and that made him smirk. He was going to do so many things to her the second she got off that damned phone.

"Oh, sure babe. Don't work too hard, love ya." Johnny spoke out to her before hanging up.

As soon as that phone fell off her shoulder and away from her ear, Leo grinned more and stood her twin sister up, pulling down her skirt and panties. "My my, so wet, even while talking on the phone with your boyfriend." He said mischieviously and then pulled her over into his lap, forcing her to straddle it. His cock rubbed against her pussy lips and her clit, getting it nice and wet before going inside her. "Hey Julie, did your ass get a bit bigger too?" He asked as his hands went around her hips and to her her ass, giving it a light squeeze.
 
Julie was wet just thinking of her brother's cock and when she finally had it in her pussy, she moaned out in satisfaction. Her brother had remained hard even if he came after tit-fucking her, he was sure...he should be hard for her until she was satiated because she was so horny.

She smirked at him, "Want to try my ass don't you?" She started grinding herself on his cock, it was so big and her tits were jiggling now. She clamped tight on her brother's cock, the head just reaching everything that needed to be reached while her pussy lips rubbed very nicely against him. She slowly started to move up and down, pumping her self on the hard cock. "You feel so big Leo," she mewled in satisfaction. "So big and hard," as she put her hands on his shoulders. Her tits jiggling in front of him.
 
Leo grinned and spanked her ass a little bit, feeling it jiggle in his other hand. "I bet you want me to shove it in you." He told her mischieviously and licked one of her nipples gently when she jiggled her tits in front of him. "Such delicious nipples too." He said and wrapped his lips around one, suckling on it for a moment, letting his tongue flick up and down on it.

After a short while, he pulled away and looked up at her. "Come on sis, turn around and shove this cock inside your pussy, I want to know what it feels like to fuck you hard." He told her and let go of her so she could turn around for him. Her tits and ass were so nice and large, he couldn't wait to have a nice fuck-fest with her, hoping it'll go on all night.
 
Julie moved, she really wanted a hard fuck and with her twin brother's cock it was finally possible. "Fuck me bro, make it hard," she mewled as she clamped her pussy tight with her hands on his knees. she started to move up and down, slowly. Teasing, she smiled back as she made screwing motions.

"You like your twin sister's pussy?," she smiled at him then she slammed herself then lifted again. Fucking herself on his cock, it was so big. "Ughnn, feels so good bro.. your cock is just so big, filling me up," his balls were slapping against her ass. Her pussy juices were dripping, seems they both have more of everything than usual.
 
Leo moaned out when she pushed his cock inside herself, his hands wandering up her back, over her shoulders, and to her breasts, grabbing them and squeezing them hard as she began to ride him. When she slammed herself down on his cock hard, he could feel her cervix with the tip of his cock.

"Oh fuckkk, I love your pussy, Julie!" He said with a moan and pinched her nipples, squeezing her breasts hard and thrusting his cock up into her each time she crashed won. "You're making me go so deep inside you, and you're so tight too!" He said with another moan of pleasure, squeezing her tits harder and playing with them more. "Do you want your brother's cum inside you sis?" He asked once and just kept thrusting his hips up into her when she kept coming down on him.
 
"Yes, Leo...ungh...ungh...Harder bro, mash my tits harder. I can feel you hands until my clitty," she moaned as her brother fondled her breasts. Each pull sent a throbbing tingle to her pussy, they were so damn sensitive. He was squeezing them and rubbing them made her arousal go a notch higher. Can it be any hotter, "Leo...pinch it again, Like before. Harder, please," she whimpered.

She slammed herself on his cock, she was so wet and slippery. But gripping it as she slid up, her pussy not wanting to let it go. She was bucking her hips now and moaning as she rubbed her clit on Leo's balls before she slid up. Slam, grind and up. This was so fucking good, her tits swaying with force even with Leo fondling them. She leaned her head back, "I'm cumming Leo...." she was rocking harder but she wanted this longer.
 
Leo did as she asked, pinching her nipples hard and tugging on them to turn her on even more. He could tell how turned on she was by the way she was riding him. He continued to buck his hips as she kept slamming down, pushing deeper into her, hitting her cervix each and every time that she crashed down.

"Julie, I'm gonna cum too..." He warned her, not caring if he was gonna cum inside her. He wanted to just keep fucking her like this all night, it felt so amazing, his cock was throbbing for more. "Let's cum together." He told her and after a few more slams from her, he moved his hands to her hips and came. His cum exploded into her pussy, filling her up to the brim with lots of gooey, sticky cum.
 
"Oh...Oh...Leo...your cock is so big and hard," she crooned as she clamped down hard on her twin's cock. Nothing like a hard cock to ride as her breasts jiggled and her hips bucked. Her toes curled and she came, just as her brother came and she could feel him flooding her as her juices guhsed out. That made her tremble again, and she moaned as he came again. She was panting heavily now, but still moving and rubbing her crotch on her brother's balls.

She could feel their mingled juices flowing down her thighs to her legs. She leaned back, her brother's hands still on her tits. She reached down and scooped some of their juices and started licking her fingers. "Uhmmm," she moaned as she wriggled. She turned her head and smiled at her twin. "You're a great fuck."
 
Leo just sat there as she shifted around on his large cock, feeling his balls being massaged by her pussy. His hands continued to slowly massage and tease her big tits. He could feel all of their juices mixing and stirring inside her pussy, wondering just how much he came inside her. He then saw her lick their juices and grinned, kissing at her neck gently and holding her breasts still in his hands.

"Julie, you're a great fuck too, and I want some more now." He said with a grin and began to thrust up into her a little bit again, wanting to fuck her some more and much harder. "Why don't we go on your bed or mine and have you get down on all fours?" He suggested to her with a wink and a kiss on her lips.
 
Julie kissed her brother and then stood up, his humongous cock leaving her pussy with a plop and his cum gushed out in a river. She was so filled with cum and her pussy juices that as she walked to her twin's bed, she was leaving a trail of spunk. The room was musky with sex and she went on the bed, crawling to the middle.

She looked over her shoulders, smiling at him. "What are you waiting for?" she called out as she swung her tits and rubbed her nipples on the sheets. has her breasts grown an inch or two, she swore they weren't these big. "Fuck my ass Leo," she crooned. "Fuck me hard," she cried out as she spread her legs and thrust her ass out.
 
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