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Science geek Brian hoped to win the approval of his stepfather Frank and stepsister Olivia by inventing a emotion enhancing device that would make the family rich and famous. He had his work cut out because neither of them were very fond of him to begin with. Frank thought Brian was a daydreaming fool. In addition he resented how much money Brian was costing him. Brian often used his credit card to purchase tools and materials for his inventions. So far, these investments had not paid off. All Brian's prototype devices had been failures. Meanwhile, Olivia had her own misgivings about Brian. Rating him as a socially inept nerd, she tried to have as little to do with him as possible. This double rejection from Frank and Olivia left Brian feeling very sad. What made matters worse was that his stepfather and stepsister had exactly the kind of close relationship he himself longed for. Frank doted on Olivia and spoiled her rotten. She could notch up a credit card bill twice as big as Brian‘s, and Frank would merely laugh with her about it. In turn, Olivia was a classic daddie's girl. Around Frank she was as sweet and affectionate and innocent as can be. Her mean side only ever showed toward her stepbrother. Nevertheless, Brian was determined to continue work on his device and win the pair over. Thus, after a morning in which he had again been lectured by his stepfather for spending so much money, and he had again been treated like a leper by his stepsister, he headed into his workshop and got down to business like never before. The commitment paid off, for Brian soon had the device finished. All that remained then was to test it. Since Frank had left the house for work, it was Olivia who would be Brian's guinea pig. She was up in her room, relaxing, playing on her phone when Brian entered and asked her for assistance. In his hand was the mind-control device. It comprised a cylinder that emitted a brain-hijacking signal, and a cordless handset for issuing commands to whomever it was pointed at. On getting a glimpse of it, Olivia was not impressed. She assumed it to be just another dud invention of her stepbrother's. Rather than agree to help Brian out, she told him to go away and leave her alone. Ordinarily, Brian would have obeyed his stepsister. But today was different. He was desperate to find out if his advice worked. If it did, he hoped to command Olivia into being kinder to him in future. Therefore, he ignored his stepsister's remark, placed the cylinder on a nearby table, aimed the remote control at her, and pressed a button - all before she knew what was happening. The cylinder beeped once. Then Olivia became perfectly still. Knowingness disappeared from her eyes, and was replaced with a thousand-yard stare. In a split-second the lively young brat had changed into a silent, unthinking doll. Even Brian was surprised by the effectiveness of his device. When he waved a hand in front of Olivia's face, she did not so much as blink. The pressing of another button caused her to stand up like an obedient robot. Taking hold of Olivia’s arms, Brian maneuvered them into several different positions to make sure her body had become fully compliant and did not display any muscular resistance. The results pleased him greatly. Olivia held herself in whatever pose her stepbrother set for her. She might have been a stop-motion figurine. However, Brian was about to discover that his device had a very strange glitch. Upon uttering the command that Olivia should show love him, he pressed a button and waited. He expected his sister to start acting friendly toward him. What he got was a lot more than he bargained for. Brian's device must have scrambled his command when it relayed it to Olivia's mind. Instead of SHOWING love, she tried to MAKE love. Springing suddenly to life, she threw herself at Brian, wrapped her arms about him, crushed her body hard against his, then kissed him on the lips. Startled, Brian fumbled with his device, trying to shut Olivia down. But now it did not seem to work properly at all! Meanwhile, Olivia was rapidly overpowering him with her horny assault. The next thing Brian knew, his stepsister had yanked his pants down, pulled out his cock, dropped to her knees, and commenced to suck him off. It was a wonderful new feeling for the young man - one that sapped him of all resistance. The device had made Olivia an utter wanton. For the longest time, eagerly and expertly, she plunged her lips up and down her stepbrother’s cock. Brian did not want the incident to end, even though he knew it was wrong. But then he heard Frank enter the house downstairs. Panicking, Brian scrambled away from Olivia, pulled up his pants, and again tried the device on her. On this occasion it worked. Olivia froze while knelt, her mouth open and her hand still poised as if were wrapped around Brian‘s shaft. Things might have looked strange to Frank if he had walked in right then, but at least he would not have seen the worst of what had been going on. For Brian the experience was very troubling. His one comforting thought was that Olivia would not remember anything of what had happened. That was one of the blessings of the device. No awareness while under its control meant no memory afterwards. Nevertheless, he went back to his workshop and thoroughly overhauled the device. He did not want a repeat of the previous malfunction. Neither did he intend to test it on Olivia again. But things worked out differently. Later, he was sat in the kitchen, taking a break from his work, when Olivia happened to come in. Brian's device lay in his lap. Olivia noticed it and frowned. Turning to Brian, she asked if he had used it on her earlier in the pool room. She seemed to have the vaguest sense of performing some weird act for him. Brian admitted that he had briefly activated the device in her presence, but that he turned it off because something went wrong. There was nothing to worry about - he assured her. Everything had been fixed. Then, without thinking, he picked up the device and pressed a button to prove his point. Just as before, Olivia's behaviour transformed. She had returned to her wanton state! Brian did not have time to be baffled by his device's second malfunction. All his attention was taken up with fending off the advances of his stepsister. To add to his problems, his father was back in the house - in the room next door. The slightest suspicious sound might draw him in. Thus Brian kept quiet, even as the unstoppable Olivia pushed him back against the counter and knelt to undo his pants. Brian had a major case of deju vu right then. Familiar fantastic feelings came over him as his stepsister took out his cock and gave it a stroking and a sucking that was even longer and more passionate than the first time. Indeed, Brian found it so incredibly pleasurable that he began to lose all self-control. Shame and fear about making-out with his stepsister vanished from his mind. He no longer wanted fretted about what was happening; now he wanted to take things further. He wanted to fuck with his new Olivia-toy to his heart's content. When Frank called out, asking him if he had seen Olivia, Brian replied that he had not. He did well to sound convincing - especially since Olivia was in fact bobbing her head up and down on his cock like crazy at that very moment. Nevertheless, the young man did not want to ride his luck too far. As soon as the opportunity presented itself, he slipped off to his room, smuggling Olivia along with him. There he had the privacy to really go wild with her. And that's precisely what he did - starting with a missionary-style fuck. Brian may have been a geeky virgin, but he was also a natural in the sack. Stripped naked, Olivia lay rigid and silent beneath her stepbrother while his big cock pounded deep into her pussy without her even knowing it. Not once did her blank expression break. Brian had at last found the button that made her freeze. Again intrigued by his stepsister’s robot-like stiffness, he sometimes played with her arms, putting them into various positions. Following this long and spirited opening action, Brian moved Olivia into his adjoining bathroom, sat her on a counter, and fucked her all over again (while often playing with her arms, as before). After that, it was back to the bedroom for two more tremendous fucks - one reverse cowgirl, the other doggy style. Olivia’s petite body got a thorough work out by her horny stepbrother. His hard, pussy-penetrating thrusts caused her pert breasts to jiggle and her little butt to shake. Yet she still did not have the slightest idea of what was going on. Her mouth was fixed agape, her eyes empty, her face expressionless. The power of the device was amazing. In her normal state, Olivia would not have let her stepbrother anywhere near her. However, thanks to a few mind-hijacking waves and the pressing of some buttons, she was now allowing him to use her in the most intimate ways imaginable. This passiveness was there right to end - when Brian commanded her to kneel down while he jerked off into her face. Streaks and globs of the stuff covered Olivia’s nose and cheeks, but she gave no reaction at all. Brian would have spent a while enjoying his post-cum buzz if he had not suddenly heard his stepfather’s voice approaching from down the hall. Apparently the older man was bringing him some laundry! Hastily, Brian tried to cover up all signs of his depraved activity. He scrambled into his clothes, commanded Olivia to go hide in his closet, then fled the scene through a back door. He felt too flustered to hide his guilt from his stepfather. As it happened, Frank found out the truth all by himself. It was stood there facing him when he opened the door to Brian’s closet to put the laundry away. What the Hell! he exclaimed. It was all the words he could manage. The sight was shocking for him: Olivia, his dear daughter, statue-still, unblinking, naked, her pretty face smeared with cum - looking for all the world like a life-size doll stashed in a box.