Elena laid awake until way past midnight, listening to Tom through the baby monitor. Tom was also awake, moaning in both pain and ecstasy as the heat sensor deep inside Elena's damp underwear sparked electric shocks into his nipples.
Tom kept calling out her name, often accompanied by words of love. That made Ellie glow and tingle. She would reach beneath the covers to touch herself, stimulating her young naΓ―ve body into wild sexual fantasies. The sensor tracked every change in her aroused body, sending remote instruction to Tom's nipple clamps and ordering them to sizzle.
Behind her innocent eyes, there was a tussle between her teasing lust and her love for Tom. She didn't like to hear him in pain and would take pity, calming her body to relieve his growing cries. It was the perfect balanced reaction, linking their bodies in a wonderfully intimate feedback loop, even though he was locked in her basement and she was naked in bed two floors above.
*
Elena slept well and woke with a smile on her lips as she felt the sensor still pinned between her legs by the clinging fabric of her lingerie. Her dreams had been wilder than she remembered, but she wouldn't know what her body had inflicted on Tom until she checked the data. Her first instinct was to run down to the basement to check the results, but even Ellie knew that skipping downstairs and parading almost naked in front of Tom was cruel. Instead, she showered and dressed in blue jeans and grey woven top, before skipping down to the basement to parade in front of her prisoner.
"Tommy!" Elena cried as she saw him panting in his cage.
Tom's face was red as if he had been slapped, and the words, 'Car key for chastity key' were scrawled across his face in red lipstick. His mouth was taped shut with duct tape and when Ellie eased it off, she found her sister's underwear jammed inside Tom's mouth.
"She took the chastity key, El!" Tom moaned, his mouth dry and sore from accommodating Kate's panties.
"Stupid Kate!" Ellie hissed, throwing a piece of paper across the room in an Ellie-style rage, "Just 'cos I told her she couldn't have my car today!"
"What about my cock?" Tom repeated.
Elena was about to storm up to her sister's room when Kate conveniently appeared at the basement door. Her black top revealed that she wasn't wearing a bra, and her semi-translucent pale blue shorts proudly showed only naked flesh beneath.
"Seen my pants, El?" Kate smiled.
"This is my research, Kathrine!" Ellie screamed.
Elena hated her sister's blatant sexuality and stepped back against the cage as her sister's rolling hips advanced. She wanted to attack her younger sister, but she knew that she would lose. Last time, she had ended up pinned between her sister's thighs and she desperately didn't want that to happen in front of Tom.
"Panties?" Kate asked again.
Ellie had always been intimidated by her sister's confidence and meekly picked up the black lingerie, holding it by fingertips as she returned them to her sister.
"Oh yes, that's where I left them," Kate teased.
"How could you forget!" Elena retorted with her usual naivety.
"Well Tom didn't say anything," Kate giggled.
Elena was about to point out that poor Tom had been gagged with her smelly pants before realising that Kate was playing with her.
Tom sighed, watching helplessly as the sister's squabbled. As always, Kate was teasing Ellie and she was now unbuttoning her blatantly sexual shorts and sliding them seductively down her tanned thighs. Ellie reacted, which only encouraged Kate to ham up the show as she stepped into her black underwear, now soaked with every last drop of Tom's saliva, and then theatrically eased back into the short blue shorts.
Kate walked towards the cage and looked down at Tom, "They're damp!" she scolded.
"You put them in his mouth and tapped him shut!" Elena exclaimed.
"Mmm... I must look after my panties more carefully."
Tom looked on feeling sorry for Ellie. She was so beautiful and kind, but so easily tormented by her more worldly sister. Tom wanted to defend Ellie, but both women spun around to stare at him as he opened his mouth.
"What have I told up about talking?" Kate's voice was ultra-confident, and her hands were already unbuttoning her shorts.
Elena unexpectantly laughed out loud, and then quickly muffled her giggles with her hands. Kate could be so funny and the look of shock in Tom's eyes was to die for. She followed Kate as she walked slowly around the cage and then untied her ponytail so that her long blonde hair hung free like her sister's, "What were you saying Tommy?" Ellie giggled.
The sisters shared a look.
"Do you want me to leave my pants," Kate smiled, "In case he tries to talk again?"
Elena grinned back with a squeeze of her sister's hand, "I have my own," she whispered mischievously.
Elena was distracted by the real-time results flashing up on her laptop. The argument with her sister had created a different correlation between Tom's heartrate and arousal level and her mind was whirring to understand this new phenomenon.
"I'm sorry if I messed up your research, El, I just really need the car."
"Car..." Kate replied, her big brown eyes glued to the screen.
Elena reached for her handbag and hunted through its contents for a large bunch of keys from which she freed her car key. In return, Kate fished Tom's chastity key out of the back pocket of her shorts.
Elena seemed surprised as Kate offered her the small padlock key, "Oh, I don't need that today."
"What?" Tom cried.
Both sisters spun around and stared accusingly with their hands on their hips . The family resemblance was strong, the defiant eyes and flick of hair over their shoulders.
"Yours or mine, El?" Kate purred menacingly.
"Both if he says another word."
Elena sat down on the cage deliberately slowly, her jeans less than an inch from Tom's face and totally blocking his field of vision, "I want you to count every stich in these jeans... miss one and you start again, understood?"
Ellie felt proud. She could see that her sister was impressed, and they shared a knowing smile as Kate, the car key and the chastity key bounced back up the stairs.
*
"Ellie?" Tom whispered, nervously addressing the fidgety denim butt that was perched above him.
"Shush..."
"I've been in here all night," Tom begged.
Elena tried to fart, she strained but nothing came out.
"Please darling!"
Elena moved her laptop, opened her legs and looked down, "That fits..."
"What?"
"Your mental and physical arousal has been getting higher all night and is now at crazy levels you poor thing. Hence the term of endearment," Elena explained, "The more I detach you from the real world, the more you fixate on your captor. What would another eight hours do?"
Tom was starting to panic, fighting against the bars, his heart rate spiking, "No, Ellie. Please!"
But the deceptively innocent woman on the other side of the bars knew how to control him. She picked up the silky white underwear that had spent the last twenty-fours on her aroused body and that were now soaked in her scent. Tom's heartbeat was racing as she laid it across his nose and mouth and pushed down to seal in her scent. His breathing instantly slowed, leaving him whimpering into the fabric.
"Can I own you for the day?"
Tom didn't reply, intent only on sucking in air until the silk moulded to his face like a mask.
Elena knelt down, leaned on the cage and studied her subject through a mess of blonde hair. She had heard about such experiences and how they could impose permanent changes to a captive's thinking.
"This reaction to my scent may be permanent," she whispered in delight, "Just being close to my scent may eventually trap you in a semi-hypnotic state."
Tom didn't understand what Ellie was saying, although he knew he was trapped in her eyes. He certainly felt different, as if he had reached a high from which his mind couldn't leave.
"Tomorrow's drug," she breathed, turning back to her computer and tapping her butt, "Your life may depend on receiving it," she whispered to herself.
*
Tom felt a pang of disappointment when Elena unlocked his cage later that morning. It felt odd to be free. Elena helped him to his feet and wrapped a towel around his naked body. The shower helped a little, but he still couldn't think of anything but his cute studious friend.
"You okay?" she asked.
"You look nice."
Elena was keeping mental notes as Tom took her hand and insisted that he buy her lunch. However, as they ate, Tom's over-devotion started to fade. A friend joined them and by the end of lunch had arranged to spend the afternoon playing football with friends.
"Can I have you tonight?" Ellie whispered meekly as he left, "For my study? Please?"
"Sure, El," he replied, kissing her cheek as he left.
*
The basement felt lonely that afternoon and Elena almost shrieked with excitement, her fists clenched, as Tom returned only two hours later.
He stepped closer to kiss her cheek, "Wow, I love the smell of your hair, El."
Elena bit down on her lower lip. That was out of character for him and a sign that maybe he was becoming permanently ensnared. She turned to her laptop.
"Low levels of arousal this afternoon," she announced with her back to him.
"You still monitoring me?" Tom seemed amused as he tapped his metal cock, "Has your sister returned the key?"
Elena shook her head, creating waves of blonde locks.
"Would you tell me if she had?"