Chemistry Girl

Note: Everyone in this story is 18 years old and above. This story contains incest between brother and sister, so if it makes you uncomfortable then please find another story. Most importantly, this is a work of complete fiction.

Even in her dream, Lisa couldn't believe what had happened the night before. But how did she recognise the dream for what it was? She had apparently been screaming with delight for hours without tiring her voice or forcing the neighbours to call the police. Lisa was splayed out on the bed of her parents, with Mark's head wedged in between her knees. Mark was licking her moist cunt. Lisa was begging Mark to keep licking her, to press his tongue into her clit and lick and suck her while he drove as many fingers as he could into her pussy lips. She was drenched in sweat and writhing in pleasure, her hands clutching tightly at the comforter covering their parents' bedsheets. Oh, fuck, it was nice to have her brother lick her nonstop. Lisa could see people standing on both sides of the bed as Mark devoured her like a starving animal. It was difficult for her to see the people watching Mark go down on her because of the intensity of her passion and the orgasms she was experiencing.

One of the people Lisa could make out was Sarah, her best friend, who was staring at her with eyes full of lust. Lisa glanced at her best friend's hands under her very short skirt. Lisa bit her lower lip and stared at the vigorous movement of Sara's fingers against her own clit before looking at the boy standing next to her.

Johnny, the quarterback of the high school football team, has had an eye on Lisa ever since she hit puberty. After her eighteenth birthday, he hit on her numerous times without much luck. After all, Lisa heard rumours from her fellow cheerleaders that he wanted to take her to Point Pleasant, an area on the outskirts of town that overlooked the coastline. It was a place for high schoolers to gather with their dates for some 'intimate sessions'. And here he was in Lisa's dream, stroking his cock while a maniacal smile formed on his face.

Lisa then turned her attention and, between screams of pleasure, exclaimed at her brother, "Don't fucking stop, baby!" Her breathing was quick; she heard the rapid thumping of her heart in her ears as her attention went to the Emo student who did some schoolwork for her, then to the nerds--both male and female--and then to many of the students in the school who knew her, including the rest of her cheerleading squad. The room was filled with people; it was as if the size of the room increased to contain all of these people. She and Mark were surrounded by them, with their parent's bed in the middle of the room.

Suddenly, she laid her sights on Mr. Thompkins, who was stroking his cock under his trousers. Lisa looked back down her sweaty and heaving breasts at Mark, whose attention was fully on licking her pussy. She could also feel his fingers massaging her G-Spot once again, leading her to arch her back and yell out a scream that, if this wasn't a dream, she was certain the neighbours would be able to hear her. "Fuck!!! Fuck!! Fuck!! Mark... Oh, Mark... Fuck!!! Fuck!!! Oh God!!!!! Shiiiiiiiiiiiiiit!!!! You're making me... Fuck!!! Cumming!!! Don't Stooooooooop!!!!!!!" Coming down from an orgasmic high for the umpteenth time as tears of pleasure flowed down her cheeks and dripping down onto the comforter, Lisa opened her eyes to Thompkins taking off his trousers and shirt before stroking his cock once again. Lisa closed her eyes and parted her lips to release a loud moan as her brother inserted his tongue through the folds of her pussy while his thumb was gently caressing her clit.

"Harder!!!!" Lisa yelled out before screaming out as waves of pleasure swept through her body all at once when he pressed down on her clit while vigorously rubbing it. She had no idea what happened to her brother the previous night; what she did know was that he enjoyed it. As did Lisa herself. Hell, it was her brother who took her virginity, which was something she never thought would have ever happened. After all, it was incest. But it did happen, and she loved it. She didn't want it to stop. She wanted Mark to continue. It was then she realised that Mark wasn't just taking in her own juices; he was also taking in the cum he shot into her pussy last night.

'Fuuuuuuuuuck, that's soooo hot!!!' Lisa thought to herself while screaming in pleasure once again as clear liquid shot out of her and onto her brother's face. And despite it all, Mark continued to lick her. After her orgasm, she turned her attention back to Thompkins, who was shooting his cum onto the carpet from the opening in his glans. He was smirking at her, and she smirked back at him. This was a dream, after all. Turning her attention back to the top of Mark's head, Lisa couldn't help but wonder what this meant for her and Mark. Would they be together as a couple? Lisa immediately nixed that idea since their parents would most likely disown them. Would it be better to find a boyfriend and fuck Mark on the side? Maybe. But it would depend on Mark's thoughts about their situation. What she did know was that no matter the reason for Mark's sudden desire to fuck her, Lisa was not going to stop fucking him.

Lisa's mind went blank before she screamed out in pleasure once again without being exhausted. 'Fuck, dreams are so wonderful,' Lisa thought to herself. It would be a few seconds later that she returned her attention to the others around her. All of them were naked now, all of them either stroking their cocks or vigorously playing with their cunts. They all had their lips parted as if silently grunting, moaning, or screaming as they came. She observed numerous cocks spraying cum into the air while the women in the crowd surrounding Mark and herself squirted pussy juice onto the carpet.

"So good," Mark whispered between licks. "You taste so fucking good, sis."

"Yeeessssssssssss," Lisa hissed as Mark returned to using his tongue to fuck her. Suddenly, the sounds of multiple voices began to whisper from all around Lisa.

"Heaven, Lisa, this is heaven," Mark whispered before going back to using his lips and tongue to kiss and lick her pussy lips, respectively. Lisa mewled as she rolled her hands into fists as her body continued to violently writhe while Mark held down her hips so that he could continue his work. Lisa then heard Sarah's voice calling out for her.

Lisa turned her head and stared at Sarah, who was continuing to rub her clit while squirting and yelling out, "Fuck, Lisa. I want a taste."

Numerous male and female voices yelled out, "Me too."

Some, both male and female, cried out, "Fuck!"

"Slut!" some females yelled out before those same voices screamed out in pleasure.

Some voices yelled out, "Whore! Yeah, that's it, whore. so hot!!!"

"I want a taste, Lisa!"

"Me too!!!"

The last two voices were a surprise, and they seemed to come from behind her. Pulling her head back, her eyes widened at the sight of her naked parents. She thought the shock of seeing her parents--her father with his hard cock in his hand and her mother with her fingers disappearing into her shaven pussy--would wake her up. But it did not. Lisa watched with a fascinated expression on her face as her father stared at her while stroking his cock. There was so much hunger in his eyes, and there was a mixture of both hunger and jealousy in the eyes of her mother. Lisa screamed in pleasure once again before looking down at Mark, who, with his face slick with a mixture of sweat and her juices, lifted his head and looked around at all the people who surrounded them.

"We have an audience, sis," he said before there was a grin towards the forms of their parents and then towards her eyes. "We all want to fuck you, sis." Lisa watched as Mark kissed her pussy lips before slowly making his way up her body. As he did so, he licked her mound and her abdomen--she could feel his saliva leaving a trail on her body--before he reached her breasts. Lisa moaned as he kissed each nipple before moving further up her body. The tip of his tongue traced the curve of each breast, and before long, his body was over her. She could feel the hardness of his shaft between her pussy lips before closing her eyes and releasing a sigh as he reached down with one hand, followed by inserting only his glans into her pussy.

Lisa opened her eyes and smiled at the hunger etched on her brother's face. She could feel his glans holding still at the entrance to her pussy. There was a sensation of pleasure building within her body as Mark leaned down and their lips locked. Lisa kissed him passionately. She could feel the tip of his cock at her entrance, as if it were a rocket being prepared to launch. Lisa wanted him to ram it into her. She could feel how horny her brother was just from their kiss, and he was so horny. And so was she. She wished Mark would fuck her like this when they were awake. She felt as if there was a buildup of erotic pleasure within her. It was as if she was a battery full of energy that would violently explode if not released.

As Mark began kissing her neck, he rammed his cock into her. The pent-up energy Lisa felt building inside her, despite all her orgasms, simply exploded at one go, leading to her snapping her eyes open while screams of pleasure escaped her lips. Her vision was slightly blurred, but she could make out Mark in the darkness surrounding them; he was on top of her. Mark was fucking her!!! He really was fucking her!!! Before she closed her eyes while screaming out loud "GOD, YES!!!!" as Mark pistoned his cock in and out of her with enough force to have her tits bounce wildly, she caught sight of the dresser to her left, which was located in their parents' room. Mark was fucking her on their parent's bed.

"Fuck me, Mark!!!!!" she exclaimed, turning her head up towards Mark, who continued to thrust harder and faster into her. "Fuck me!!!" She placed her hands on either side of him, just under his arms. She could feel his sweat dripping down the length of the underside of her arms while his hands were pressing down on the mattress on either side of her shoulders.

As his cock continued to slam into her, Lisa continued to exclaim, "Fuck your sister!!! Fuck me!!! Fuck me!!! Shit!!! Fuck!!!" in pleasure as Mark thrust in and out of her with increasing fervour. This was so much better than the fucking she received from behind the previous night!! As he neared the brink of orgasm, Lisa felt a rush of pleasure flooding through her body. She felt Mark's cock spasm inside her and knew he was about to cum. She was panting as she felt warmth spreading up from her pussy to the top of her head. Lisa heard Mark grunt as he continued to fuck her as if she were some whore he met somewhere out on the street.

Just as she was ready to cum, Lisa felt her brother's arms wrap around her as he lowered his body into hers while simultaneously pulling her body into his. Mark kissed her passionately as he continued to thrust--both moaning into their mouths as their tongues danced--until both of them exploded in orgasm. Lisa tensed, her mouth wide open in a silent scream, while her eyes rolled back in ecstasy. At the same time, Mark pulled his head up and growled, "Fuuuuuuuck! Cumming!! Shit!!! Cumming!!! Cumming!!!" Lisa felt as if their bodies melted into each other as globs of thick liquid were ejected into her pulsing pussy.

"You're cumming inside me! Fuck Mark, I love your cum!" Lisa breathed out.

After they finished and had just begun to come down from their high, Lisa lay breathless in her brother's arms, their bodies still pressed into each other, while he continued to gently kiss and lick the sweat off her neck. Lisa couldn't help but feel grateful for having such an amazing brother. Not only had he just given her one of the most intense orgasms she ever had; in fact, she didn't even orgasm this hard when fingering herself or during their tryst yesterday evening. She could genuinely say that she never felt closer to him than she felt right at that very moment. As she was about to close her eyes, Lisa's body spasmed with pleasure when she heard Mark whisper in her ear that he wasn't done yet. Lisa opened her eyes and smiled as he nibbled her ear before sliding his body--made easier by their sweat-covered bodies--down towards her chest. Lisa watched as he licked her skin, hungrily taking in her sweat around her nipples. His body was between her legs, and she could feel her wet pussy pressed against his abdomen even as he took her left nipple into his mouth.

As Mark licked and sucked her nipples, Lisa felt the intensity of their passion build inside her once again. She was grating and grinding her cunt against the wet skin of his abdomen, their eyes locked to each other as the movement of his mouth on her nipples sent shockwaves of pleasure through her body. She loved feeling him press against her and enjoyed the feeling of being completely taken by her brother. Growling after licking each nipple once last time, he slid up her body and then whispered into her left ear, "Wrap your legs around my waist, baby." At the same time, Mark reached down between them and grabbed his cock before guiding the glans to the outer edge of Lisa's cunt. With a deep moan, Lisa followed her brother's instructions and wrapped her legs around his waist just before meeting his thrusts as he began to move faster and deeper. With every thrust, she could feel his cock rubbing against her g-spot, and her pleasure was growing exponentially. The sensations were almost too much for Lisa to handle, and before long, they both climaxed together. As they lay tangled in each other's arms afterwards, she released a satisfied sigh while rubbing the back of his head with her hands before kissing each other.

Mark then pulled back from the kiss and whispered in her ear that it was nearly seven in the morning and she needed to get to school. Lisa whined, "I want to stay home, Mark, but if I miss any of Mr. Thompkin's lab experiments, I don't think he'll give me the C-minus I need."

"I feel... no, I know I can fuck you all day, sis. I also know you need to get to school." Mark whispered in her ear while his left hand was playing with her sweat-covered breasts. "There's something... something that's bringing this on... the only way I can explain it is that something is bringing out this hunger inside me."

Lisa closed her eyes as he pressed her nipples between two of his fingers. Opening her eyes again, she felt the sensation of pleasure going through her body had dwindled down, a result of her brother letting go of her nipple. Lisa watched Mark, her eyes sweeping up and down his nude, sweaty body, as he got off the bed and then turned around. He grabbed her legs and gently pulled her--Lisa giggled as her wet body dragged the wet comforter beneath her--to the edge of the bed. She released a sigh as Mark bent down and then slipped his toned arms beneath her back and just under her ass before carrying her. She yelped before grabbing onto his neck with both arms. Mark just stood still, his eyes fixed on Lisa, who rested the side of her head on his chest.

"I love you, Mark," Lisa whispered as Mark turned around while carrying his sister.

"I love you too, sis," Mark replied as he walked towards the door leading to the washroom in the master bedroom. The both of them couldn't help but realise that not only had they fucked on their parent's bed, they were about to use the shower in their parents' washroom. Nearing the door, Lisa unwrapped one arm around his neck and then reached out to open the door and turn on the lights for the washroom. Mark gently kicked the door wide open and stepped onto the cold tiled floor.

"I need to pee," Lisa whispered before Mark leaned down, placed Lisa's feet first on the tiled floor, and stepped back. Lisa turned and arched an eyebrow at her brother, who shrugged before saying, "We just had mind-blowing sex, and you're going to have the heebie jeebies about me watching you pee?"

"It's one thing to have mind-blowing sex, and it's something totally different about watching someone pee," Lisa chuckled before telling her brother to leave her be, "or else I won't tell you about the super-mind-blowing orgasms you gave me in the dream I just had."

Mark was now genuinely curious about her dream, and it showed in his expression as he went, "Oh?"

"I'll tell you about the people around us as you ate my pussy."

"Oh?" Mark grinned while wagging his eyebrows. "There were people?"

"Let me pee in private, and you go do your stuff too, and then I'll tell you," Lisa said before her lips formed a smirk.

"But we are showering together, right?" a curious Mark asked, just in case she changed her mind.

Lisa rolled her eyes before saying, "D'uh." And then waving her arms and shooing him away. Chuckling as Mark rushed out while saying he needed to take a piss as well, Lisa sat down on the toilet and breathed a sigh of relief as she took her piss. As she did, she suddenly felt a throbbing pain in her abdomen, but it lasted for a few seconds. Lisa didn't think anything about it as she stood back up, flushed the toilet, and then slid open the frosted screen door that led to the shower. She stepped in and then adjusted the shower head before turning on the tap. Stepping back out of the shower, Lisa watched the streams of water flow out of the shower head for a few seconds before she walked out naked into her parents room, where she could smell the scent of strawberries mixed with the smell of sex, sweat, and cum. She would have to air out the room by opening the windows after she came back home from school.

'I'll ask Mark to take the comforter down to the laundry room... I'm guessing we need to wash the bedsheets too.' She then heard Mark flush the toilet in their shared washroom. She looked out the door to the master bedroom and into the hallway as Mark stepped out. She watched her naked brother walk towards her, taking long strides as he did so. Within a few seconds, Mark was on her before drawing her into his body and kissing her with abandon.

"All I could think about was you, Lisa," Mark whispered in her ear before kissing her once again. As they kissed, he walked her backwards into the washroom and then into the shower. Lisa felt the warm water fall on the side of her head before it flowed down the side of her body. She could feel Mark's hands caressing her back before one reached down and cupped her left ass cheek while the other hand travelled up her back and to the base of her neck. Mark pulled back from the kiss, causing Lisa to open her eyes as he panted, "When I wasn't with you in the washroom, all I could think about was you. Only you. All I wanted to do was grab you and just fuck you."

Lisa took a sharp gasp of air as Mark firmly pressed her back against the tiled shower wall while reaching back and closing the shower screen. "I can write a note saying you're sick." Lisa couldn't help but chuckle at Mark's joke. The chuckle died down, however, when Lisa noticed he wasn't kidding. There was a seriousness on his face that felt out of place for her normally jovial brother. He leaned in and pressed his lips into hers--something that Lisa welcomed as she returned the kiss with gusto, their lips and tongues in a delicate dance, and her own arms around his body with her hands caressing his toned back. She moaned as Mark continued to kiss her cheek and then her left ear. He nibbled her earlobe before whispering, "Stay, baby. I want to fuck you everywhere in the house. From my room to yours, to the kitchen, to the garage, to my car. I want to fuck you on the front lawn and in the backyard; I don't care if the neighbours hear us screaming when I cum inside you."

'That would be so hot,' Lisa admitted to herself. She had never realised how good it was to fuck her brother. And she wanted to continue... She wouldn't mind having a sick day and staying at home. She could imagine Mark fucking her throughout the house--points of interest that she could remember every time she walked past. But she also knew that this C-minus was important. She needed this grade.