Later that night, after everyone had gone to bed, Becca couldn't sleep. The images of Andy in her underwear, his cock locked up in that cage, how he had squirmed as Mary had brought her to orgasm flashed through her mind. She knew it was wrong, but... She grabbed her phone, hesitated, then typed out a message to Andy.
'Andy, I need to know. What's it like?'
Her heart raced as she hit send, waiting for his reply. A few minutes later, her phone buzzed with his response.
'It's... intense, Becca. The cage, it's always there, rubbing against me, teasing me. And Mary, she controls everything. When I can cum, what I can do, who I can be with. It's... humiliating, but also... exhilarating. I know it's twisted, but it's what I need.'
Becca's stomach churned, but she found herself asking more questions, pushing for details of their encounters. The she learned about this dark world of submission and humiliation, the more curious she became. It was like train wreck—horrifying yet impossible to look away from. She stayed long into the night, researching BDSM and cuckolding, feeling a strange mix of disgust and arousal.
The following day, Mary visited again. Becca couldn't ignore the undercurrents anymore. As they all sat down for dinner, she found herself drawn to Mary, wanting to understand this world that had consumed her brother. They talked casually, but Becca couldn't shake the images in her mind: Andy, his cock trapped, serving his Mistress. She tried to focus on her food, but her mind kept drifting back to the cage, the humiliation, the power dynamic.
As the meal wrapped up, Mary excused herself to use the bathroom. Becca seized the moment, grabbing her brother's phone and opening up the messages between them. She couldn't believe what she was reading—Andy pleading for release, begging to be used like a slut. A wave of nausea washed over her, but beneath it was something darker, something twisted. She continued reading, her fingers trembling as she scrolled through the Andy in her underwear.
When Mary returned, Becca couldn't meet her eyes, feeling dirty and ashamed. But Mary's next move surprised her a sly smile on her face.
"Becca, dear," she purred, "I know you're curious. And I see fire in your eyes. Why don't we explore your desires?"
Becca's heart raced; couldn't believe what she was hearing. Was Mary a predator, or did she see something more in? She hesitated, but the temptation was strong. "I... I don't know," she managed to whisper.
"I do," Mary replied, her voice low and seductive. "We all have our secrets Becca. Why not embrace them? Let's make your brother watch as you explore yours."
Becca's breath hitched. She felt like was falling into a pit of darkness, but somehow, she couldn't stop. "Okay," she whispered back, her voice barely audible.
Mary saw the crack in Becca's armor. She moved with decisive grace. In one smooth motion, she slid off the couch and onto her knees on the carpet, positioning herself between Becca's legs. Becca yelped in surprise but didn't push her away.
"What are you—?"
"Shhh," Mary soothed. She placed her hands on Becca's knees. "Just feel. Just… imagine." Her hands slid up, pushing the hem of Becca's sundress higher, revealing her toned thighs. Becca was trembling. "He's watching, Becca. Look at him."
Becca's eyes, glazed and conflicted, found Andy's. He was statue-still, his own arousal a painful, obvious bulge. He gave the slightest, desperate nod.
Mary's fingers found the edge of Becca's panties. "He wants to see this. He wants to see what his sister looks like when she's wet for a fantasy." She hooked her fingers and pulled the fabric aside.
A soft, damp curl of black hair was revealed. And beneath it, the glistening, pink folds of Becca's pussy. She was soaked. The evidence of her conflicted arousal was unmistakable, shining in the afternoon light.
A low moan escaped Becca. Her head fell back against the couch cushions, her resistance crumbling. "Oh, God…"
"That's it," Mary purred. She didn't touch Becca directly. Not yet. Instead, she leaned forward, her face inches from Becca's exposed sex. Her breath ghosted over the sensitive skin. Becca shuddered violently. "He's imagining a man here. A big, thick cock spreading you open. He's imagining the sounds you'd make."
Andy's hand moved to his own crotch, pressing against the hard ridge, a silent plea. The sight was beyond anything he'd fantasized—his dominant girlfriend on her knees before his sister, his sister's most intimate place exposed and glistening because of his secrets.
Mary finally made contact. Not with her mouth, but with her fingers. She traced a single, slow, feather-light circle around Becca's outer lips. Becca cried out, a sharp, choked sound.
"You're so pretty here," Mary whispered, her voice thick with her own arousal. "So wet and hot. I can feel the heat coming off you." She dipped the tip of one finger, just barely, into the pooling wetness at Becca's entrance. She gathered it and slowly, deliberately, brought her glistening finger to her own mouth. She sucked it clean, her eyes locked on Becca's horrified, fascinated face. "Mmm. Sweet."
"Stop… please…" Becca whimpered, but her hips gave a tiny, involuntary jerk forward.
"Do you want me to stop?" Mary asked, her voice dropping to a dangerous, low register. She brought her hand back down, this time using two fingers to part Becca's lips, exposing her swollen clit. "Or do you want to know what it feels like? To have someone take control? To make you feel things you've never let yourself feel?"
Becca was panting now, her chest heaving. Her hands gripped the couch cushions, knuckles white. She looked at Andy, her expression a shattered mirror of shame and desperate need. She gave a tiny, almost imperceptible shake of her head. No. Don't stop.
It was all the permission Mary needed.
"Watch him, Becca," Mary commanded as she lowered her head. "Watch your brother watch me taste you."
And then her tongue was there. A flat, hot, wet stroke from Becca's entrance all the way up to her clit.
Becca's whole body arched off the couch, a strangled scream caught in her throat. Her eyes flew wide, then squeezed shut. Mary didn't let up. She settled into a rhythm, her mouth sealing over Becca's pussy, her tongue lashing and circling the hardened bud with expert precision. The wet, sucking sounds were obscenely loud in the quiet room, punctuated by Becca's ragged gasps and moans.
Andy was stroking himself openly now, his hand working over his pants, his eyes glued to the scene. His girlfriend was eating out his sister. His sister was coming apart under the attention. The taboo of it was a drug, flooding his system with dizzying intensity as his cock throbbed against it prison. He could see Mary's shoulders working, could see Becca's thighs beginning to tremble, could see the slick shine of saliva and arousal covering Mary's chin.
"I'm… I'm gonna…" Becca choked out, her voice high and tight.
Mary hummed in approval, the vibration against Becca's clit sending another shockwave through her. She doubled her efforts, her fingers joining now, slipping easily inside Becca's tight, clutching heat. Becca's back bowed, her mouth open in a silent scream as her orgasm ripped through her. Her hips bucked wildly against Mary's face, her legs clamping around Mary's head as she rode out the waves of pleasure, each one wracking her with violent shudders.
Mary worked her through it, gentling her licks, swallowing every drop Becca gave her. Finally, Becca collapsed back onto the couch, boneless and spent, her dress a rumpled mess around her waist. Mary pulled back, her face gleaming with Becca's release. She looked utterly debauched, triumphant. She turned her head, meeting Andy's gaze.
She opened her mouth, showing him her tongue, then slowly, sensually, licked her lips clean.
As the week went on, the tension between them grew. Becca found herself wearing tighter clothing, highlighting her curves more. Andy watched her with a mix of fear and anticipation. He knew that something was brewing, but he couldn't it. Meanwhile, Mary continued to seduce Becca, pushing her boundaries further and further.
Becca paced her room, her mind a whirlwind of confusion, of desire, of shame. She couldn't stop thinking about what had happened, about Mary, about Andy. She knew that she had to understand it better, that she had to observe it, that she had to see it for herself. She took a deep breath, her body shaking as she walked out of her room, as she made her way downstairs.
As she made up her mind, she sent a text to Mary to which Mary instantly responded.
'Becca, dear. I know that you want to understand. And I'm here to help.'
Becca felt a pang of unease, of dread, but also a pang of desire, of curiosity. She nodded, her voice steady as she typed.
'Mary, I... I need to understand. I need to see it, to observe it, to understand it better. I need to see Andy, to see what he goes through, to see what he feels.'
'Oh, Becca. I thought you'd never ask. I have the perfect plan. A double date, with a friend of mine. He's young, he's dominant, he's everything that Andy isn't. And I think, I think you're going to love it.'
Becca felt a pang of unease, of dread, but also a pang of desire, of curiosity. She nodded, her voice steady as she sent. 'Yes, Mary. I... I want to see it.'
In the days leading up to the double date, Becca found herself in a state of heightened anticipation and anxiety. She spent hours trying on different outfits, each one tighter, more revealing than the last. She wanted to look her best, to feel desirable, to push Andy's boundaries. She caught him staring at her, his eyes filled with a mix of fear, desire, and shame. She reveled in it, in the power she held over him, in the taboo of it all.
On the day of the date, Becca chose a dress that left little to the imagination. It was a deep V-neck, hugging her curves, the hem short enough to reveal her toned thighs with every move. She paired it with heels that added inches to her height, making her feel powerful, dominant. As she descended the stairs, she felt Andy's eyes on her, heard his sharp intake of breath. She turned to him, a wicked smile on her face.
"Like what you see, Andy?" she purred, twirling around to give him a full view.
Andy nodded, his voice a mere whisper. "Yes, Becca. You... you look beautiful."
Becca felt a pang of satisfaction, of power. She knew that she was pushing boundaries, that she was playing with fire, but she couldn't stop. She wanted to see where this would lead, what she would feel, what she would discover about herself.