The Lie Detector

"I could show you some pretty disturbing comics online that would ruin your childhood," Callum said.

"Like what?" Sienna said. Her head tilted in interest. She noticed her brother's eyes drop to her cleavage and quickly back up again.

"Porn comics of My Little Pony," Callum said.

"No way!" Sienna said. "Really?" She thought quickly. "Hang on.....are you trying to tell me you've been jacking off to Twilight Sparkles."

Callum laughed. "No way!" he said. Luckily the lie detector confirmed this. He liked some pretty dodgy shit but that wasn't one.

"What type of porn do you like?" she asked. Grinning. It was fun watching him start to squirm, she thought.

"Just regular porn," he replied. EHH EHH. He watched his sister smile mischievously. Oh shit, he thought.

"Sorry. That was a bit vague," she said. "Maybe I need to be more specific."

"You don't need to," he said, hopefully.

"Oh I do," Sienna said. "Anal?"

"Yeah," Callum offered willingly. He thought that was quite normal.

"Pervert," she said. She couldn't imagine wanting anything up her ass. She wasn't the slightest interested in things up her poop chute.

"Transsexuals?" she asked. This one would be good to have on him, she thought.

"No," he said calmly. Ping. Callum blew out air in relief.

"Shame. Pissing?" she asked. She had seen all the taboo subjects whilst browsing sites herself.

"No," he replied. So far so good as the machine highlighted the truth. "You know a lot of categories."

"Getting fucked with a strap on?" she asked, ignoring his comment. Smiling again. Oh god please, she thought.

"Only girl on girl," he said. PING.

"Eeewww gross," Sienna said. She had nothing against it, but again, it didn't turn her on. Each to their own, she thought.

"Incest?" she said. Asking the one question she had been working towards.

Callums face dropped. "No," he muttered. Knowing. EHH EHH.

"Interesting," Sienna said. "Mummy porn, or sister?...... Or even daddy?" She smiled.

"I'm not answering that," Callum said.

"Wrong," Sienna said. "I did, so you are."

Callum sat there thinking. He didn't want to admit he had fantasies about mums fucking sons, so thought he could wriggle his way out of it. Plus things had already gotten interesting once between him and his sister, so why not see where this leads.

"Sister," he said, flushing pink. Sienna flushed too, and not just in her face. His ploy worked as she forgot about the mum bit.

"Does that mean you've fantasised about me?" she asked, quietly.

"Yes," he answered. PING. There was no point denying it. The fact he had just fantasised about taking her, whilst she got changed upstairs was irrelevant. That was just one of many.

"Do we have sex in these fantasies?" she asked.

Stupid fucking machine, he thought. Why had he built it so perfectly? "Yes," he answered. PING.

He shifted uncomfortably. Sienna, noticed.

"Do you have an erection now?" She asked. Remembering his question to her. She knew she was wet again from the questioning. She wondered what was wrong with her.

"No," he said, weakly. EHH EHH. Sienna smiled.

"Show me," she said.

"You're my sister," he mumbled.

"Didn't stop you watching me finger myself," she snapped. She was so horny now it hurt. She needed to see him.

Callum started undoing his trousers, his hand sliding inside his waistband and underwear. He moaned as he touched himself. Not remembering when he had been so hard it ached.

He wrestled his hardness free. Sienna sat up straighter and peered over the table, she only just held back the moan. "It's big," she mumbled.

"Thanks," Callum grinned. It never got old hearing that, even from his sister, apparently.

Callum slowly stroked his cock. It throbbed desperately in his hand.

Sienna stood and walked to the other side of the table, her eyes not leaving the impressive cock in her brother's hand. It was like an outer body experience. Her legs moving, controlled by the fire burning between her thighs.

She sat on the table in front of Callum, watching him play with himself. She spread her legs, pushing her dress between her thighs. The hem rising up her leg. She ran a hand up her inner thighs, touching herself again. Through the fabric of her dress, pushing it into herself. She moaned softly.

Callum watched her. Seeing what she had done earlier, but more closely. His cock throbbed angrily.

"I want to see you," Callum said. The machine pinged. His eyes fixed on the hand bunching the dress between her thighs. It was obvious what he wanted to see.

Sienna was lost now. The sight of her brother's cock had tipped her further into depravity.

Callum's eyes widened as his sister pulled her skirt up and eased the crotch of her panties aside. Exposing her beautiful shaved slit. She slid two fingers straight into herself. Her pink wet lips spreading around the digits.

Sienna pushed her fingers deep, her tight cunt stretching open for them. She was so wet it squelched slightly.

"Do you want to be inside me?" Sienna asked. She had crossed a line now, and didn't care. Fucking him was no more wrong than how far they had gone already. That's what she told herself anyway.

"God yes," Callum moaned. PING. The machine agreed.

Sienna couldn't stop herself as she pulled her fingers out of herself and moved over her brother's lap, opening her legs.

She straddled his lap, taking his hardness in her hand, keeping her panties out of the way, guiding him to her opening.

"Oh fuck," Sienna gasped as she pushed down. She had never taken anything so big before, but she was so wet. She knew she'd manage.

"Oh god," she moaned. She pushed down harder, widening her legs. The tip stretched her open, prising her desperate lips apart. She felt herself spread over the head.

"Are you sure?" Callum managed to ask.

"I'm sure," Sienna moaned. Pain flared as she pushed hard. Then nothing but pleasure. Her eyes rolled to the back of her head as he slipped inside her.

Callum groaned loudly as her tight cunt swallowed the head of his cock, squeezing his shaft. His thoughts now turning to lasting more than a minute before squirting his load.

Sienna moved slowly, rising and falling, trying to stay in control. She took slightly more of him every time she dropped, forcing him deeper inside her. Callum's hands slipped round her narrow waist.

"Feels good," she moaned. One of his hands slid up to a breast and squeezed through her dress, the hard nipple sending more waves of pleasure through her.

He pulled a strap over her shoulder and freed one of breasts, he leant down and took the nipple in his lips, running his tongue around the hardened excitement. He had to see all of her.

Callum pulled her dress up and over her head, her braless breasts slipping free. He groaned at the sight of both and took them in his hands.

"So beautiful," he said, looking up into her eyes. PING. They both laughed before moaning as Sienna rose again and lowered herself hard, forcing all of him inside her.

Callum leaned forward and took the other nipple in his mouth, sucking, kissing, and caressing with his tongue. The other he fondled with his hand.

"Shit, that feels good," Sienna groaned. He filled her perfectly as she took every inch of him. Like it was made just for her. The ridged swollen member throbbed inside her as she started moving again.

She gripped the table, her flat stomach stretched and breasts pushed out as she lifted herself up and down his length.

"Oh god," Callum groaned. He ran his hands up his sister's ribs, taking both of her firm breasts in his hands. Her nipples still solid as he squeezed.

As good as it felt inside her she wanted to see it, to taste it. She stood and he slipped out of her, standing tall and raging with blood. To Callum's amazement she dropped to her knees and took it in her mouth.

Sienna felt her lips slide over the warm throbbing shaft. Forgetting briefly that it was covered in her own excitement. Remembering too late as she tasted herself on her tongue.

The taste of her own juices fuelled her lust. Shame coursed through her briefly at her behaviour before the throbbing cock in her mouth made her forget it all. Her need burning inside her.

Callum groaned as his sister swallowed him deep down her throat until she choked. She didn't take much in. Not used to sucking dick.

Sienna had watched enough porn though to know what to do, and she loved the sound he made when she forced the cock down her neck harder. She gagged hard and came back up, gasping.

Her mind swam with a mixture of shame and excitement. The shame because of how much she was getting off on her brother's hard cock in her mouth. It felt so good, but filthy at the same time.

She ran her tongue up it and then swallowed him in again. This time not so deep, bobbing her head and wanking him off with her lips. She loved the taste of his precum leaking from him.

Callum moaned as his sister worked on his penis. He ran a hand through her blonde hair, holding it out the way so he had a better view of her.

Her slurping sounds filled the kitchen as her lips slid up and down his shaft. He groaned loudly. If he didn't stop her soon he was going to blow his load.

Callum pulled her up and she moaned disappointingly as her mouth popped off his cock. He sat her on the table. Her ass perched on the end. They kissed hard and his hands went round her thin waist. He lowered her backwards and brought her slender legs up, opening them wide. His eyes fell on her wet thighs and pussy lips. He too needed a taste

Sienna cried out as her brother's tongue ran up the centre of her, running deep between her sensitive and engorged lips. His tongue probed inside her. She gripped his head, running his fingers through his short soft hair, pulling him into her.

"Fuck," Sienna groaned. Her hips rising to meet his mouth, pressing her dripping pussy into his face. She moaned again as his tongue prised her open.

His tongue flicked up and found her clit and she cried out, her body bucking as she nearly orgasmed.

"That's it," she moaned. "Right there." He circled her clit with his tongue and she gripped his head, pulling him into her. Her moans grew louder as he teased her with the tip of her tongue.

Callum pushed two fingers into her. Her cunt so wet it took them easily, welcoming them inside her as he pushed them deep. He licked her clit whilst sliding his fingers in and out, exploring and feeling her warm insides. His sister's juices leaked out of her, need growing and growing.

"Cum," she moaned. Her arousal was at insane levels. She couldn't manage much else. "Gonna...."

She orgasmed for the second time that evening. This time on her brother's mouth and fingers. Her body went rigid, her legs shooting out straight as they shook violently.

Callum stood as his sister rode her climax again. Shaking violently on the table. He needed her so badly. Needed to cause her more pleasure, whilst satisfying his own desire. He waited for her shaking to slow. Rubbing the head of his cock against her swollen pussy lips as she moaned softly, staring into his eyes.

Callum slid inside her again and she nearly orgasmed again, teetering on the edge of ecstasy. Every small move made her nerves blaze with pleasure. The last climax still plagued her senses.

He started rocking his pelvis back and forth and her eyes rolled again, her head dropping back against the table. Her blonde hair spilled across the table top.

"You're going to make me cum again," she gasped. "Keep going." She reached up and behind her. Her body stretched as she gripped the edges of the table above her head.

Callum ran his hands over his sister's stretched body. Squeezing her firm round breasts and making her groan loudly. He kept moving slowly, the sight of his sister in so much pleasure was incredible.

He slowly built up speed. Sliding in and out of her tight cunt. Enjoying the view of her stretched around his shaft. Her round breasts jiggled every time he thrust forward. He sped up. His hips now slapping her inner thighs.

"Oh fuck, please," she begged. Still on the edge, desperate now to hit that climax. She had never fully stopped cumming from her last. He felt so deep inside her. Her brother. The thought was all it took.

She gripped the edges of the table hard as she orgasmed again. So close from the last one. She didn't quite live up to her brother's nickname for her, but her cunt flooded with her juices as she came all over the cock inside her.

Her moans filled the room as her body shook. Her legs out straight as pleasure shot into the limbs.

Her brother didn't stop. The pleasure almost too intense as he carried on fucking her. Watching her shake against the table as his own climax built.

She tried to tell him to stop, the orgasm growing in intensity again. She tried to tell him it was too much.

Callum was too close, unable to stop as he continued. Sienna's pussy squelched with every thrust, her cunt dripping from her ejaculation.

Callum pounded into her, his climax building as his sister writhed beautifully on the table in front of him.

"I'm going to cum," Callum cried out. PING.

Sienna's eyes opened to watch him cum inside her. Part of her wanted to see him cum, the other wanted his seed inside her.

She got her first wish as he pulled out and ejaculated hard. His glistening cock exploded up her thin body, a streak of cum hitting her in the neck and chin. She flinched, but smiled. Watching raptly as he unloaded over her breasts and flat stomach. His groans filled the kitchen.

She drank in his body as the muscles in his stomach tightened and relaxed every time he spurted cum over her. The thick white jizz in pools on her sweat glistened skin.

So much, she thought. Her belly covered as it finally started to stop.

"Fuck," he moaned. His body shaking. He leaned down and they kissed. Lost in the moment. Both breathing hard. They broke the kiss and he flopped against her. She liked the feeling of his weight pressing down into her.

"Next time I want you to finish inside me," she said softly into his ear.

"There's a next time?" Callum asked hopefully.

"Only if you want to?" She said, hope in her voice too.

"I do," he replied.

PING.

THE END.

Thank you for reading.