Having spent the night together, Jake and Elena woke slowly, with sibling teasing leading to a play fight. Elena was wearing underwear and a short black negligee, but her brother was naked, and she loved how his erect cock bounced as they struggled with each other for supremacy. She knew he was letting her win, but she still loved sitting on her brother, using her full weight to hold him in a tight schoolgirl pin.
They had played like this when they were younger. Back then, Elena could really trap her brother, and she could remember sitting on him with a cruel smile on her face as his slim body struggled hopelessly beneath her. She would never admit it, but some of her earliest sexual feelings had been when her brother had been confined between her legs.
Now that she was a grown woman, she could indulge in so much more. Jake no longer tried to escape, and seemed content to languish, snuggled down deep in his sister's wrestling hold. He was even kissing his captor's thighs.
Elena's blonde hair dropped down as she looked at him, "You know you used to try to escape," she smiled.
"And how did that work out for me?" he asked.
"Not great."
Elena eased forward until her black silk underwear was resting on her brother's mouth, her body kneading against his, "I never did this when we were younger," she smiled shyly.
*
An hour later and they were still in bed, with Elena giving her brother a full body massaged. She hadn't tired of sitting on him and was resting her full weight on his chest as she played with his balls.
"What are you doing El?" Jake asked, pushing his giggling sister to one side and sitting up to find that his testicles were now encircled by a large gold padlock.
"Just claiming what's mine," Elena replied sweetly as she arched her back and stretched out innocently on the bed.
Jake's attention returned to his locked-up testicles. He had felt her cup his balls, but he had no idea that her fingers were squeezing shut a high security combination lock. His cock was now embarrassingly erect as he tried to pull his scrunched-up balls out of the small shackle.
Elena had always fantasised about laying claim to a man's genitals and her increasingly intimate relationship with her gorgeous brother was the perfect opportunity to try, "Do you like it?" she asked hopefully.
"Do you know the number?" he asked as he eased his balls away from the heavy padlock and gingerly turned the first of six dials.
"I'm the only person in the world who does..."
Jake felt his cock harden as he watched his sister. Her beautiful lingerie clad body looked so sexual yet so innocent with her legs open and her hips thrusting gently forward.
"Guess I'll have to keep you close."
Elena melted as her naked brother straddled her prone body and pinned her hands to the bed. She cried out as his fingers ran over her taut stomach, his touch sending thrills of excitement through her negligee clad body.
She smiled as her brother's padlocked balls dangled comically above her, "Works better than Viagra!" she giggled as she stole a look and reached out to stroke her brother's erect cock.
The padlock pulled at his balls and felt strangely claustrophobic, yet it only seemed to heighten the feel of her fingers. He brushed his lips against his sister's cheek and then briefly touched her open lips.
"What if you forget the number?" he asked, a reasonable question given the dreamy, faraway look in his sister's big blue eyes.
"Then you'll have to spend the rest of the year turning dials."
Jake could feel his erect cock pushing up between his sister's legs and he rolled away from her to relieve the pressure. Elena rolled over on to her front to reveal her round butt that was threatening to break free from her tight black silk panties, "Kiss my ass..." she whispered, "It'll help me remember."
Jake buried his face between his sister's cheeks, "Fuck, I can make you do anything," Elena moaned to herself.
Why did her brother's face feel so good between her cheeks? She rolled over, half sitting on his head as she hurriedly pulled off her underwear.
Two weeks ago, she wouldn't have let her brother even see her underwear. Okay, maybe a deliberate fleeting glimpse as she walked from the bathroom to her bedroom, but nothing more. She would then lock herself in her room and daydream about him and how his touch might feel.
Things had changed so quickly. Now it felt right to have him between her legs, blatantly sexual, but also caring in a sisterly way. No harm could come to him while he was kissing her clit. Now when she slid down her pants, she knew he would worship her feet, teasing her playfully until he reached her vagina. Her brother's natural devotion to her was now amplified by an enormous lock on his balls.
She climaxed and clinched her thighs tightly around his neck, rubbing her scent against him as she came down from her high. Jake didn't protest, he never did.
She slipped away and quickly pulled her underwear back between her legs as Jake's attention returned to his balls that looked ridiculous, clinched beneath his seemingly huge cock.
"That's so cute," she giggled, seizing the lock, "I can lead you around by the balls, or lock you to my bed."
She pulled the lock up slightly, drawing her brother on to tip toes and then she crotched down on to her athletic haunches, catching his erect cock in her mouth as she dropped.
"No El," he protested, but his sister's lips would not release him and within seconds he had climaxed.
Elena stood up but continued to hold the padlock as she looked around for something to chain her brother's balls to, but with nothing obvious, she led him by the balls as she walked to the kitchen.
"Mmm," she moaned in delight as Jake wrapped his arms around her and kissed her neck. His hands then moved to her breasts as he pushed her body against her.