The rest of the morning felt like a slow torture for Diana, because every time she looked up from her plate, she found Keith watching her with that same heavy, knowing expression. Leo was still rambling on about his job and some drama with his coworkers, completely oblivious to the fact that his best friend was basically stripping his sister naked with his eyes right across the table. Diana tried to focus on her food, but she couldn't taste a thing, and all she could think about was the way Keith had pressed himself against her in the kitchen and the way his voice had dropped when he told her he wins every game he plays. She felt a constant, pulsing heat between her thighs that made it hard to sit still, and she found herself shifting in her seat, rubbing her legs together just to get some kind of relief.

Keith didn't make it easy for her, because he kept finding ways to bring the conversation back to things that felt like secret codes between them. He would mention how the house felt quiet or how he liked the way the morning light hit the room, but he always looked at her when he said it, making sure she knew he wasn't talking about the architecture or the weather. He was marking his territory without saying a word, and Diana felt herself sinking deeper into the role of the prey, though she was the one who had invited the predator in. She loved the danger of it, the risk of Leo finding out, and the way Keith seemed to enjoy the thrill of doing something forbidden right under her brother's nose.

"I think I'm going to head out to the garage and finish working on that engine," Leo said, finally standing up and stretching his arms over his head. "You want to come help me, Keith? I could use a hand with the heavy lifting on the transmission."

Keith leaned back in his chair, his eyes never leaving Diana's face, and he let out a slow, lazy smile that made her stomach flip. "Yeah, give me a few minutes, Leo. I just need to finish my coffee and maybe help Diana with something first."

Leo didn't even think twice about it, just nodding and heading toward the back door. "Alright, don't take too long, man, I want to get this thing running by the afternoon," he called out over his shoulder before disappearing into the garage.

The second the door clicked shut, the atmosphere in the room shifted instantly, and the playful tension from the kitchen turned into something much more aggressive. Keith didn't move for a moment, just staring at her, and then he stood up and walked around the table with a slow, predatory grace. Diana stayed in her chair, her heart hammering against her ribs, and she watched him approach, feeling the air grow thick with the scent of his cologne and the raw energy he radiated. He stopped right behind her, and she felt his hands land on her shoulders, his grip firm and possessive as he squeezed the muscles there.

"Now that the big brother is gone," Keith whispered, leaning down so his lips were brushing against the shell of her ear, "we can stop pretending for a little while, don't you think?"

Diana let out a shaky breath and tilted her head to the side, giving him better access to her neck. "I thought you wanted to see how long I could keep the act up," she murmured, her voice trembling. "Are you getting bored already, Keith?"

He chuckled, a low vibration that she could feel through her shoulders, and he slid his hands down from her shoulders to her chest, his palms grazing the fabric of her sundress. He didn't stop until his hands were cupping her breasts, squeezing them firmly through the thin material. Diana gasped, her back arching instinctively, and she felt her nipples harden instantly under his touch. He knew exactly what he was doing, and he enjoyed the way she reacted to him, the way she was completely at his mercy the moment he decided to take control.

"I'm not bored," Keith said, his voice sounding rough and hungry. "I'm just impatient. I've spent the last hour watching you sit there and pretend to be a good little girl while I could tell you were practically dripping for me. It's a very convincing act, Diana, but we both know what's actually going under that dress."

He shifted his position, moving one hand down to the small of her back and pulling her up from the chair and flush against him. Diana wrapped her arms around his neck, her fingers tangling in the hair at the back of his head, and she pulled him closer, desperate for the contact. He didn't kiss her right away, instead choosing to bury his face in the crook of her neck, inhaling deeply and leaving a trail of hot, wet kisses along her collarbone. Every touch felt like a spark of electricity, and Diana felt her resolve crumbling, her mind screaming for him to just take her right there on the dining room floor.

"Do you have any idea how much I've wanted to do this?" she whispered, her eyes closing as she felt his teeth graze the sensitive skin of her neck. "Ever since you came back, all I can think about is you touching me like this."

Keith pulled back just enough to look into her eyes, and the intensity in his gaze was almost overwhelming. "I knew you wanted it," he said, his voice a low growl. "I could see it in the way you looked at me, the way you tried so hard to look away. You've been craving this for years, haven't you? You wanted the one guy you weren't supposed to have."

Diana nodded, her breath coming in short, jagged gasps. "Yes," she admitted, the word barely a whisper. "I wanted you. I still want you."

Keith's expression darkened, and he suddenly gripped her waist, lifting her up and setting her on the dining table, pushing the plates and glasses aside with a careless sweep of his arm. Diana let out a small cry of surprise, but she quickly wrapped her legs around his waist, pulling him into the cradle of her thighs. She could feel the hard ridge of his erection pressing firmly against her, and the sensation made her moan, her head falling back as she looked up at the ceiling.

"You're so desperate," Keith murmured, his hands sliding up her thighs, pushing the fabric of her dress up until he reached the tops of her stockings. "I can feel how much you're shaking. You're practically begging me to ruin you, aren't you?"

"Please," Diana whimpered, her fingers digging into his shoulders. "Please, Keith, I can't take it anymore. Just touch me. Please."

He didn't give in immediately, instead choosing to torture her a little longer. He slid his hand higher, his fingers grazing the edge of her panties, but he didn't go inside. He just rubbed the fabric against her clit, using a slow, circular motion that made Diana writhe beneath him. She was sobbing now, the pleasure becoming too intense to handle, and she began to buck her hips against his hand, trying to force him to go deeper.

"You want it that bad?" Keith asked, his voice sounding cruel and seductive at the same time. "You want me to stop playing and actually give it to you?"

"Yes! God, yes!" she cried out, her voice echoing in the quiet room.

Keith let out a dark laugh and finally slid two fingers past the lace of her panties, diving deep into her warmth. Diana screamed, the sudden intrusion sending a shockwave of pleasure through her entire body. She was soaking wet, her walls clamping down on his fingers as he began to move them in a fast, rhythmic motion. He wasn't being gentle; he was pushing deep, hitting her spot with a precision that made her vision blur.

"Look at you," Keith whispered, leaning in close so she could see the triumph in his eyes. "Look at how you're reacting. You're not a shy little girl right now, are you? You're just a dirty little brat who wants to be filled up."

Diana couldn't even answer him, her mind completely gone, replaced by the raw, physical sensation of his fingers inside her. She felt the tension building in her stomach, a tight coil of energy that was about to snap. She gripped his arms, her nails scratching into his skin, as she felt the first wave of her orgasm crash over her. She let out a long, loud moan, her body shaking violently as she climaxed, her internal muscles squeezing his fingers in a desperate grip.

As the waves of pleasure slowly subsided, Diana lay there on the table, her chest heaving and her eyes glazed over. She felt completely undone, stripped of every defense she had ever built. Keith didn't pull his hand away immediately, instead staying inside her for a few more seconds, feeling the aftershocks of her release. He looked down at her with a mixture of possessiveness and hunger, and Diana knew that this was only the beginning.

"You're mine now, Diana," he whispered, his voice sounding like a promise and a threat all at once. "You might be able to play the innocent sister for Leo, but when you're with me, you belong to me. Do you understand?"

Diana looked up at him, her eyes filled with a mixture of love and fear, and she nodded slowly. "Yes," she whispered. "I'm yours."

Keith finally withdrew his hand and stepped back, adjusting his clothes with a calm efficiency that contrasted sharply with the chaos he had just caused in her body. He looked at her one last time, a smirk playing on his lips, before he turned and walked toward the garage.

"I'll be back in a while," he said over his shoulder. "Make sure you clean yourself up before Leo comes back inside. We wouldn't want him to wonder why you're breathless and shaking."

Diana stayed on the table for a long time after he left, her body still humming with the remnants of the pleasure. She felt a strange sense of peace, knowing that the secret was finally out, and that she didn't have to hide her desires from him anymore. But she also knew that by giving in to Keith, she had entered a game where the rules were written by him, and she had no idea how it would end. As she slowly slid off the table and began to straighten her dress, she could still feel the ghost of his touch on her skin, and she knew that she would do anything to feel it again.

The next few days were a complete blur for Diana, because she spent every waking second wondering when Keith was going to find another excuse to get her alone. Every time she saw him in the hallway or caught a glimpse of him talking to Leo in the living room, she felt that same heavy pull in her gut, and her skin practically itched for him to touch her again. She tried to act normal, keeping her head down and playing the part of the quiet sister, but it was getting harder and harder to hide the way her breath hitched whenever he walked into the room. She could tell he knew exactly what he was doing to her, and the way he looked at her—like he was just waiting for her to break—made her feel both terrified and completely electrified.

Leo was still preoccupied with the car, spending most of his time in the garage and leaving Diana and Keith in a state of constant, simmering tension. They didn't talk much when Leo was around, but the silence was loud, filled with the memory of the dining room table and the way Keith had claimed her. Diana found herself dressing differently, choosing thinner fabrics and shorter skirts, hoping he would notice and hoping he would do something about it. She was acting like a brat, and she knew it, but the thrill of the secret was becoming an addiction that she didn't want to quit.

One afternoon, while Leo was out running errands to get more parts for the engine, Diana was in the kitchen making a pitcher of iced tea. She was humming to herself, feeling relatively relaxed, until she felt a presence behind her that made the hair on her arms stand up. She didn't even have to turn around to know it was Keith, because the air always seemed to get thicker and hotter whenever he got close. He didn't say anything at first, just stepped up behind her and pressed his chest against her back, his arms reaching around to grip the edge of the counter, effectively trapping her between the granite and his body.

"You've been avoiding me, Diana," Keith murmured, his voice low and rough right against her ear. "Or maybe you're just trying to see how long it takes before I lose my patience and take you again."

Diana leaned back into him, her hips brushing against his hardness, and she let out a soft sigh. "I haven't been avoiding you, Keith. I've just been trying to be a good girl, since you seem to enjoy the chase so much."

He chuckled, the sound vibrating through her spine, and he shifted his grip, sliding one hand from the counter to her waist and pulling her firmly against him. "I don't want you to be a good girl. I want you to be exactly what you were on that table. I want you desperate and shaking and begging me to fill you up."

He didn't wait for her to answer before he turned her around in his arms, his movements quick and decisive. He hoisted her up onto the kitchen counter, pushing the pitcher of tea aside with a clatter, and stepped between her legs, forcing them wide open. Diana wrapped her legs around his waist immediately, her fingers digging into the fabric of his shirt as she pulled him closer. She was already wet, the mere sound of his voice making her core throb with a need that felt almost painful.

"I've been thinking about you all day," Diana whispered, her eyes searching his. "I couldn't even focus on anything because I kept remembering how you felt inside me."

Keith's eyes darkened, and he grabbed the hem of her dress, sliding it up and over her hips until it was bunched up around her waist. He didn't bother with her panties, instead just hooking his fingers into the lace and pulling them to the side, exposing her dripping heat to the cool air of the kitchen. He stared at her for a moment, his gaze intense and possessive, before he leaned down and buried his face between her thighs.

Diana let out a loud, sharp gasp, her head hitting the backsplash of the counter as he pressed his tongue against her clit. He didn't start slow; he used a firm, rhythmic licking motion that sent a jolt of electricity straight to her brain. She began to moan, her hips bucking instinctively as she tried to push herself closer to his mouth. He was relentless, using his tongue to swirl around her sensitive peak before sucking it deep into his mouth, creating a vacuum that made Diana scream.

"Oh god, Keith! Right there, please don't stop!" she cried out, her fingers tangling in his hair, pulling him tighter against her.

He ignored her pleas for a moment, instead sliding two fingers deep inside her while he continued to suck on her clit. The combination of the internal pressure and the external stimulation was too much, and Diana felt her walls clamping down on him in tight, desperate pulses. He could feel her peaking, and he accelerated his pace, his fingers curling and hooking inside her, hitting that one spot that made her entire body go rigid.

"You're so tight for me, Diana," Keith mumbled against her skin, his voice muffled but clear. "You're practically shaking. Tell me who you belong to."

"I'm yours! I'm yours, Keith!" she sobbed, her voice breaking as the first wave of her orgasm hit her.

As she climaxed, her body reacted violently, and a sudden, hot gush of fluid erupted from her, soaking his hand and splashing onto the counter. She was squirting, her body releasing everything in a powerful, uncontrolled surge that left her gasping for air. Keith didn't pull away; he stayed right there, feeling every single contraction of her muscles, his fingers still buried deep inside her as he drank in the sound of her surrender.

Diana slumped against him, her chest heaving, her mind a complete blank. She felt completely drained and utterly satisfied, the tension that had been building for days finally snapping. But Keith wasn't finished. He pulled back, looking up at her with a smirk that told her he was just getting started. He stood up, stripping off his pants and boxers in one fluid motion, revealing a thick, pulsing erection that made Diana's mouth go dry.

"Now it's my turn," he said, his voice sounding like a command.

He grabbed her thighs and pulled her to the very edge of the counter, positioning himself perfectly. He didn't use any lubricant, because she was already soaking wet from her release, and he drove himself into her in one long, powerful thrust. Diana screamed, the sensation of him filling her completely sending a new wave of pleasure through her. He was huge, stretching her walls to their limit, and the feeling of him bottoming out inside her made her eyes roll back in her head.

He began to move, his pace fast and aggressive, each thrust hitting her deep and hard. The sound of their bodies slapping together filled the kitchen, a raw and carnal rhythm that drowned out everything else. Diana wrapped her arms around his neck, her legs locking behind his back to pull him even deeper. She was sobbing again, not from pain, but from the sheer intensity of the friction and the way he was claiming her over and over again.

"Look at me, Diana," Keith groaned, his face strained with effort. "I want you to see me while I'm ruining you."

She opened her eyes, seeing the raw hunger and the dark obsession in his gaze, and it only made her want him more. She felt herself building up again, the pleasure stacking on top of the previous orgasm until she felt like she was about to explode. She began to moan his name over and over, her voice a desperate plea for him to finish.

"I'm close, Keith! Please, I'm so close!"

He didn't slow down; instead, he gripped her hips and slammed into her with everything he had, his movements becoming frantic and powerful. He let out a low, guttural growl as he hit his own limit, his body stiffening as he dumped his load deep inside her. Diana felt the heat of him filling her, and the sensation triggered a second, smaller climax that left her shivering in his arms.

They stayed like that for several minutes, their breathing heavy and synchronized, the only sound in the room being the ticking of the clock on the wall. Keith eventually pulled out, the wet sound of his exit making Diana shiver. He didn't move away immediately, instead leaning in to kiss her deeply, his tongue sliding against hers in a slow, possessive motion.

"You're a little addict, aren't you?" he whispered, pulling back just enough to look at her. "You love this. You love that I can make you lose control like this."

Diana couldn't even argue; she just nodded, her eyes glazed and her lips swollen. "I do. I love it."

Keith smiled, a dark and satisfied expression, and he began to dress himself with a calm efficiency. He looked at her one last time, seeing her sprawled out on the counter, messy and undone. "Clean yourself up, Diana. Leo will be back any minute, and we can't have him finding out that his sister is a little slut for his best friend."

He walked out of the kitchen without another word, leaving Diana alone with the cooling tea and the lingering scent of their passion. She lay there for a while, feeling the drip of him inside her, knowing that she was now completely trapped in his web. She didn't care about the risk or the lies; all she cared about was the way he made her feel, and the terrifying realization that she would do absolutely anything to keep him coming back for more.

The days following that afternoon in the kitchen felt like a slow burn that Diana couldn't put out, and she found herself constantly on edge whenever she heard Keith's footsteps in the hallway. She tried to keep her composure when Leo was around, but the secret they shared felt like a physical weight pressing against her chest, making her heart race every time Keith caught her eye from across the room. Leo was still obsessed with that car, spending hours under the chassis in the garage, which basically gave Diana and Keith a free pass to play a dangerous game of cat and mouse right under her brother's nose. She could tell Keith was enjoying the power he had over her, and the way he would occasionally brush against her hip or whisper something filthy in her ear while Leo was talking about engine parts made her feel like she was walking on a tightrope.

Diana spent most of her time trying to distract herself, but her mind kept drifting back to the feeling of him filling her up and the way he had completely taken control of her body. She started noticing the small things, like the way he watched her walk away or the way his gaze lingered on her chest when she leaned over to pick something up, and it made her feel a mixture of fear and intense arousal. She knew she was playing with fire, and she knew that Keith wasn't the kind of man who played fair, but the thrill of the risk was the only thing that made her feel alive lately. She found herself wanting more, wanting to be pushed further, and wanting to see just how far he was willing to go to claim her as his own.

One rainy Tuesday, Leo decided to head into town to pick up a specialized set of tools that he couldn't find online, leaving the house completely silent except for the sound of the rain drumming against the roof. Diana was in the living room, curled up on the sofa with a book she wasn't actually reading, because her mind was too preoccupied with the thought of Keith being just a few rooms away. She heard the floorboards creak behind her and didn't even have to look up to know he had entered the room, because the air seemed to shift and grow heavy the moment he stepped inside. He didn't say anything at first, just stood there watching her for a long minute, his presence filling the space and making her skin prickle with anticipation.

"You look far too innocent sitting there with that book, Diana," Keith said, his voice a low rumble that sent a shiver straight down her spine. "I can see it in your eyes, though. You've been thinking about what I did to you in the kitchen, haven't you?"

Diana closed the book and looked up at him, her breath hitching as she saw the dark, hungry look in his eyes. "Maybe I have, but that doesn't mean I'm just waiting around for you to decide when you want to use me again," she replied, trying to sound defiant even though her voice was shaking.

Keith laughed, a short and sharp sound, and he walked over to the sofa, leaning down so his face was only inches from hers. He reached out and gripped her chin, forcing her to look him straight in the eyes, and the intensity of his gaze made her feel like he was reading every dirty thought crossing her mind. "You love it when I decide, and you love it even more when I don't give you a choice. You're a little liar, Diana, but you're a very honest slut when you're underneath me."

He didn't give her a chance to respond before he grabbed her wrist and pulled her off the sofa, dragging her toward the hallway and into the guest bedroom. He slammed the door shut behind them and pushed her back against the wood, his body pinning her in place as he began to kiss her with a raw, desperate hunger. It wasn't a gentle kiss; it was a claim, his tongue pushing deep into her mouth and his hands roaming over her body with a possessive urgency that left her breathless. Diana wrapped her arms around his neck, pulling him closer and moaning into his mouth, her body already reacting to his touch with a familiar, throbbing need.

Keith pulled back for a second, his breathing heavy, and he looked down at her with a smirk. "I want you on your knees, Diana. Right here, right now. I want to see you beg for it."

Diana hesitated for a split second, the shy part of her fighting against the desire, but the dirty-minded side of her won out instantly. She slid down the door and sank to her knees on the carpet, looking up at him with wide, pleading eyes. She reached for the button of his jeans, her fingers trembling as she undid them and slid the zipper down, releasing his thick, pulsing erection. He was already hard, the head of his cock glistening and smelling of musk, and the sight of it made Diana's mouth water.

"Do it," he commanded, his voice sounding like a whip. "Show me how much you've missed this."

Diana didn't need to be told twice, and she leaned forward, swirling her tongue around the tip before taking him deep into her throat. She focused on the sensation of him filling her mouth, using her lips to create a tight seal and sucking him with a rhythmic intensity that made Keith groan. He gripped the back of her head, his fingers tangling in her hair as he began to thrust his hips forward, controlling the depth and pace of the act. He wasn't being careful, and he pushed himself deep into her throat, causing her to gag slightly, but he didn't slow down, enjoying the way she struggled to take all of him.

"That's it, take it all," Keith groaned, his voice strained. "You're so good at this, aren't you? Just a little pet for me to play with."

Diana looked up at him while she continued to suck, her eyes glazed with pleasure, and she could see the sheer dominance in his expression. She used her hand to stroke the base of his shaft, her fingers rubbing against his balls while her mouth worked on the head, creating a combination of sensations that had him swearing under his breath. He was getting close, and he could feel the tension building in his legs and lower back, and he decided he wanted more than just her mouth.

He grabbed her by the shoulders and hauled her up, flipping her around so she was facing the door and pushing her chest flat against the wood. He hiked her skirt up and ripped her panties to the side with a single, violent tug, exposing her soaking wet heat to the room. He didn't waste any time, sliding his fingers deep inside her from behind, his touch rough and demanding. He found her clit and began to rub it with a firm, circular motion, while his other two fingers curled and hooked inside her, hitting that spot that always made her lose her mind.

"You're dripping for me, Diana," Keith whispered, his breath hot against her neck. "You're so wet it's practically running down your legs. You've been thinking about this all day, haven't you?"

"Yes! Yes, please, Keith, I need you inside me!" Diana sobbed, her head leaning against the door as she bucked her hips back against his hand.

He didn't give it to her immediately, instead continuing to tease her, his fingers sliding in and out of her with a wet, slapping sound that filled the room. He was driving her to the edge, pushing her further and further until she was shaking and pleading for him to stop the torture. He could feel her walls clamping down on his fingers in tight, desperate pulses, and he knew she was right on the verge of a massive release.

"Tell me what you are," he demanded, his voice low and dangerous. "Tell me who owns this pussy."

"You do! You own it! I'm your slut, Keith! Please, just fuck me!" she screamed, her voice breaking.

The moment the words left her lips, Keith pulled his fingers out and positioned himself at her entrance. He drove himself into her in one long, brutal thrust that bottomed out completely, making Diana let out a loud, piercing shriek of pleasure. He didn't give her a second to adjust, immediately starting a fast, punishing rhythm that slammed her body against the door with every hit. The sound of their flesh colliding was raw and carnal, a rhythmic thudding that echoed through the quiet house.

Diana was completely lost in the sensation, her mind turning into a blur of heat and friction. She felt like she was being split open, but the pain was eclipsed by the overwhelming pleasure of him filling her so completely. She reached back, trying to grab onto him, but he gripped her hips tightly, keeping her pinned and ensuring that every thrust hit her deep. He was relentless, his movements aggressive and focused, and he began to growl as he felt his own climax approaching.

"I'm going to fill you up so much you'll feel me dripping out of you for hours," Keith groaned, his pace becoming frantic.

Diana felt the pressure building in her core, a tight coil of tension that was about to snap. As Keith delivered a final, powerful series of thrusts, Diana's body suddenly went rigid. She felt a hot, explosive surge of fluid erupt from her, a powerful squirt that soaked the carpet beneath them and splashed against the door. She was climaxing violently, her muscles contracting around him in waves of intense pleasure that left her gasping for air.

The feeling of her squirting triggered Keith's own release, and he let out a guttural roar as he dumped his load deep inside her, his body shaking with the force of his orgasm. He stayed buried inside her for a long time, his chest heaving against her back, both of them drenched in sweat and shaking from the intensity of the encounter.

Eventually, Keith pulled out with a wet pop, and Diana slumped against the door, her legs barely able to support her. He stood back and looked at her, his eyes dark and satisfied, seeing the way she was completely undone and trembling. He didn't offer a hand to help her up; instead, he just watched her, enjoying the sight of her submission.

"Clean yourself up," he said, his voice returning to that calm, commanding tone. "And make sure there's no trace of this in the room before Leo gets back. I don't want him thinking I'm being too gentle with you."

He turned and walked out of the room, leaving Diana shivering on the floor, her body still pulsing from the aftershocks of the orgasm. She looked down at the wet spot on the carpet and felt a strange sense of pride, knowing that she had been completely claimed by him. She knew that this was only the beginning, and that the obsession was only going to grow, but as she felt the warmth of him still inside her, she realized she didn't want it to ever stop.