Disclaimer: I don't own LWD or Cruel Intentions. (:

(A/N) I wanted to write a LWD-CI style, because, well, it's uncanny how similar the two stories are. Come on - Kathryn Merteuil vs. Casey MacDonald? Sebastian Valmont the player vs. Derek Venturi the player? And they're both stepsiblings? Haha, okay, so it's not that uncanny. But I wanted to write it anyway! This fic was just for fun, really. Thanks for reading! (:

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Paul put his face in his hands. "Again?"

Casey MacDonald wiped the tears from her eyes and sniffed. "Yes. But this time, Sam and I have broken up for good."

"For good." He raised an eyebrow, all too familiar with this phrase.

"I mean it. We're through." She folded her arms, daring her counselor to dissent.

He didn't. Instead, he sighed, "Okay, then. I'll take your word for it." He then folded his hands on the table. "But, Casey, there's something I actually need to talk to you about."

Casey fidgeted – since when did her counselor need to talk? He did the talking. "Sure."

"It's about your stepbrother. Derek."

What isn't?

"He went out with my little Marci the other day and never called her back. She's heartbroken! Maybe you could remind Derek about her. She'd really appreciate it."

Casey raised an eyebrow. "Um, Paul," she smiled, "I wouldn't worry so much about Derek not calling Marci. She shouldn't take it personally – he does that to every girl he goes out with."

Her counselor's grim facial expression indicated that that probably wasn't the most reassuring thing to say.

"Uh." Casey parted her mouth, planning on rephrasing her words to soften the blow. Fortunately, however, the bell rang at the exact moment she began to speak. "Oh!" She said, silently thanking the bell system. "That's the bell! I'll see you, same time tomorrow?"

He nodded. "Yeah. And, uh -"

Casey smiled knowingly. "And, yes, I will remind Derek."

"Thank you, Casey."

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Casey slowly gunned the accelerator on Derek's new red Civic, smiling and admiring how smoothly she passed the car driving alongside her. She was so glad that her mom had forced Derek into letting her borrow his car. Derek, on the other hand, had not been so pleased – his exact words, as he sneeringly dropped the keys into her hand, were, "This is the first and last time, Casey." Casey had only smirked triumphantly.

As she pulled into the Venturi-MacDonald driveway, Casey found her thoughts drifting to Sam. She seethed, her grip tightening on the steering wheel. Sam had come up to her the other day and given her that annoying, oblivious stare before saying, "There's someone else, Casey."

Someone else?

He hadn't given a name, but, then again, Casey hadn't given him the chance. She had simply yanked off the relationship necklace and thrown it at his face. Casey MacDonald just didn't lose. She hated to lose.

Casey slammed the car door shut before digging into her bag for her house keys. She sifted through a plethora of essentials before she finally opened the door. And what she found inside was far from pleasing.

What…

"Casey." A boy her age, wearing a hockey jersey and a blue beanie, was seated in her living room, looking awkward. "Hey."

"Sam?" Casey felt her blood boil. "What the hell are you doing here?"

Her stepbrother, Derek Venturi, emerged from the kitchen, chewing a day-old slice of pizza. "Oh, hey, Casey," he mumbled, mouth full of food. "Sam here was just leaving, weren't you, buddy?"

Sam alternated looks between Derek and Casey. He looked blatantly uncomfortable. "Uh, yeah, just leaving." He scrambled to pick up his things and slid past Casey's frozen frame. Casey could smell his familiar scent. She hated it now – the smell of cinnamon turned her stomach.

When the offending creature had finally left the vicinity, Casey plopped onto the tan couch. "I didn't know it was Asshole Day at the Venturi house."

Derek rolled his eyes and finished his pizza in two bites. "Trust me," he said. "I'm just as mad at him as you are right now. I only invited him over to find out some needed information."

"Could've fooled me. You guys looked pretty chummy."

"Casey." Derek shot her a look. "Hasn't anyone ever told you? You keep your friends close and your enemies closer."

"But I thought he was your best friend."

"Was being the operative word. That was before Kendra decided to cheat on me with him."

"What?" Casey, who had just picked up an apple, sputtered and dropped it in shock. "Wait, Kendra's with Sam? Kendra is the 'someone else' that Sam left me for? Kendra, resident airhead?" She felt warm tears leak out of her eye ducts, threatening to spill. Kendra?

Derek plopped onto his favorite armchair and put his feet on the coffee table. "The very one. So, I now plan to devote all my effort into destroying Sam."

"I didn't know you were capable of devoting effort to anything."

Derek glanced lazily at his stepsister. "I hate losing."

"But why Sam? Why not Kendra?"

"Casey, Casey, Casey." He dropped his feet and clasped his hands. "I see you still have the mind of an amateur. You see, if I destroy Kendra, it'll be traced back to me."

"You're terrible."

"Please. Like you don't want in on my plan."

"I don't." Well…

"You don't want to get revenge on Sam?"

"I don't want to hurt him." Well…

"Trust me, my plan won't physically hurt him. But by the time I get through with him, Kendra will be running back into my arms."

Casey bit into her apple thoughtfully. She was all too familiar with Derek's plans. They never worked, and she doubted that his latest would either. But she humored him anyway. "What's your plan of attack?"

"It's simple. I get Kendra to catch Sam cheating on her with someone else, then she'll break up with him. Then, once she sees that I'm with someone else, she'll become desperate to come back to me. You know how jealous she gets." He smirked.

Casey's eyes narrowed. "There are a lot of problems with your plan, Derek."

"How so, dear sister?" He raised an eyebrow.

She put her chin in her hands. "For one, you need someone to seduce Sam. Then, you need someone to pretend to be your new girlfriend."

Derek waved her offending questions out of the air. "Easy. I have it covered. I can pull this off in a month, tops."

Casey smirked. "You don't stand a chance."

"Oh?" Derek leapt out of his armchair and sat onto the arm of the couch, facing Casey. "Care to make a wager on that?"

He might as well have said, "Care to make some easy money?" Casey knew that Derek's plan would eventually find a hole and spiral down the drain, as had been the case with his previous ones. "Sure," she grinned.

"What are the terms?"

Casey thought for a while, searching for the perfect prize. Her lips slowly curled upward as her mind settled on one thing. "If I win," she announced, "that hot new car of yours… is mine."

"And if I win?"

The words were already resting on her lips, which were formed in a subtle smirk. "I'll give you something that you've been obsessing about ever since our parents got married."

"What, for you to move out?"

Casey smiled. "I think you know what I'm talking about." She often caught her stepbrother looking at her in a way that went beyond what was acceptable for a family member to do so, and she often did the same to him. Even though they were semi-related, she was still an attractive girl, and he was still an attractive boy. They both still had hormones, after all! Casey never acted on it, but instead, waited for a time to use it to her advantage. And now is the perfect moment to do so.

"Oh, that." Indeed, Derek had caught on. He ran his eyes quickly down Casey's body. "You got yourself a bet."

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(A/N) How was it? I hope you liked it. Please feel free to leave me some motivation in the form of a review! Thanks so much for reading. I'll update ASAP! (: