Derek laid on his back, the feel of cool grass against his bare skin. The sky was dark and majestic; a perfect summer evening. Tomorrow he would be making his way back to London, an irate Casey barking orders from the passenger side. The thought of their pending fights excited him more than he cared to admit. He knew that every fight had been instigated by him in some way or another. She's tried far harder to be "the perfect family" than he has. But why would he want to be perfect? If he failed to insult her, it only meant that he was letting her in as his sister. The thought repulsed him to a high degree. He could accept lizzie that way...but never Casey.

Derek couldn't understand why Casey was simply his step-sister, never feeling like actual family. Someone that was forced upon him when he wanted nothing more than to kick her ass out of his home. At first he had been excited that Casey decided to wait a year before going to Queens. A whole year without miss perfect sounded like a little slice of heaven. But then he started thinking even harder about it.

A whole year without Casey.

Casey far away. Casey in another country. Casey in another country with twinkle-toes Jesse.

Derek shot to a sitting position and rubbed his temples fiercely. He had no idea where these feeling were coming from. Tonight when they had danced, he only wanted to get a rise out of her. He wasn't completely stupid. He could feel daggers being thrown his way by Jesse and a look of confusion coming from Roxy. Their parents were too idiotic to notice anything out of the ordinary, so he took advantage of the moment.

Pulling her into his embrace was a mistake the moment he did it. And despite the small struggle, Casey had melted into him. Her sweet frangrance had intoxicated his senses, making it impossible to think. Derek had no idea why his mind and body had betrayed him. It was in the way he had ran a finger over her soft full lips or pushed the hair from her eyes. She had shook from his ministrations, her body letting him know that she liked his touch.

He had joked to himself, and to Sam when his best friend had had the audacity to date Casey, that if he gave her the time of day, she would be putty in his hands. He never actually believed it until tonight. Over the years, he had been saying how repulsive and ugly Casey truly was. It baffled him that anyone could honestly think he meant a word of it. The girl was beautiful.

But she was always Casey. The stuck up virgin snob that nobody liked. And it wasn't until he began dating Kendra that he realized how much that prissy bitch meant to him. That's why he had to get rid of his girlfriend. She knew what was lurking in his mind, even if he would deny the fact clear to his grave. He didn't need anyone reminding him about his secret obsession with his step-sister.

Derek shot to his feet and began getting dressed.

"Derek?" A sleepy voice called to him in the night. Roxy was laying on her stomach with only a pair of pink panties on, the moon highlighting her body beautifully.

"I gotta get back. It's almost 2 and I gotta be up by 7." He reached in this pocket for keys to the jet ski.

She came over to him and put two slender arms around his neck, deepening a kiss that would have seared him hours before. But this time it left him empty. What was wrong with him? He forced himself to kiss her back with as much desire as she was showing him. He may be an ass most of the time, but he's never skipped out on a girl after sex without a proper goodbye.

"I'll miss you. This has been the most amazing summer of my life."

Derek gave a genuine smile. "I'll miss you, too. We'll keep in touch. Step-granny seems a little more use to the idea of me now that the sticks been pulled from her ass," he gave Roxy one last peck on the lips before whispering, "I'll be back...eventually."

"Bye," he said pulling away. Wading up his shirt and vest into a tight ball, Derek hopped onto the jet ski and started the engine. He wasted no time taking it up to full speed. The crisp air and cold water did wonders for his senses. Riding a jet ski in the middle of the night without a life vest or anyone around had to be one of the more idiotic things he has done. But right now he could care less.

The ride ended far too soon and he reluctantly tied it to the dock before heading to his room. Fumbling in the dark for the correct key, he opened the door and pushed past the thresh hold with light steps. It was hard to believe that the vacation from hell was finally over, even if the trip had turned out pleasant enough. Derek was ready to go home, sleep in his own bed, and catch up on hockey. That had been the worse part of this entire vacation. No T.V.

Slipping below the covers that spread across the couch, he slid out of his pants and settled in for a few hours sleep. He sighed heavy, not realizing how tired he had been until this very moment. But something kept him from fully succumbing to sleep.

Derek opened his eyes and gazed in the direction of Casey. With the moon filtered in through the window, he could clearly see that she was watching him. He could feel her penetrating stare hitting his skin from a mile away. And as he gazed at her, she never looked away. It seemed as if they stayed like that for hours, even if it had only been seconds.

Her hair framed her face in a halo. She looked like the angel she truly was. Lifting up on one elbow, he challenged her with his eyes. Derek wasn't certain what he was asking of her. But he waited, hoping she would answer his own question. Instead of saying anything, she simply lifted a delicate hand up to her face and pushed glistening locks back in a soft motion before turning her back to him.

It was as if she was turning away from him for good. Saying goodbye. It didn't matter that they still had a month together before she left. It felt too soon. Especially after all that had happened in just a few hours.

Derek lifted himself off of the couch and made his way twords Casey. He was completely naked and stopped in his tracks. That was the last thing he needed. Uptight Casey to start screaming because she's never seen a cock before. He groped in the dark for a pair of boxers and rested them on his lean hips before walking the rest of the way to Casey's bunk. He never paused for fear of losing his nerve.

He sat down on the bed. What did he expect to happen? Derek wasn't sure what he was doing, or why for that matter. The only thing that was certain was the dance they had shared. No one could fake something so intimate.

Casey froze, her eyes closed in sleep that was clearly a facade. "Case?" Derek whispered.

"What?" she hissed out, barely audible.

Derek wasn't sure what to say, so he spoke to Casey the only way he knew how. "So you wanna talk about earlier? Why did you run out on me when you were clearly about to faint at my feet?"

That got Casey's attention. She sat up quickly, fury written all over her face. "You have some nerve doing what you did and then come in here and act like it's my fault. I'm not the one who grabbed you to dance; I'm not the one sitting on your bed right now. I saw the way you were looking at me tonight and it stops right now! It's two in the morning. You've been gone for the past four hours and you can't tell me that that entire time you were riding around the lake. You reek of another women, yet still come over here and act like something happened between us." Casey paused to take a breath and then lowered her voice a mere octave. "You...are...beneath...me, Derek. I don't play these childish games and I'm not wasting a second fulfilling my step-brothers twisted fantasy."

Derek sat looking into an ocean of hatred written inside Casey's eyes. He had been on the receiving end of her fury before, but never like this. This was like a women scorned. He knew he felt it earlier this evening; her body responding to his touch. There was no mistaking it. It was the same response he had gotten from every female he had ever graced with his presence.

Casey jerk to the side and plastered her body to the wall, getting as far away from Derek as she possibly could.

He was trying to pin point the odd feeling that he was having. It was a sharp pain in his chest. Not physically, but emotionally. Women have turned on him before in the past. But never like this. She just told him that he was beneath her. That made him angry, but he knew it was true. Everything she had said was true. Who sleeps with another girl while having his step-sister on his mind? He was sick and twisted. Derek wished that he could say this was the first time.

But it wasn't.

First Kindra, but she was nothing like Casey. Not physically or emotionally. And then there was Sally and several other girls over the years. But maybe it had started sooner than he wanted to admit.

It all started with Vicky. He hated that bitch with a passion but the moment she shut up, and if you squint just right, she looked exactly like Casey.

"Shit," he muttered into the night. Despite speaking out loud, she continued to ignore his existence. He placed a hand on her hip, feeling her stiffen beneath his touch. Suprisingly, Casey didn't break his arm like he had anticipated.

"Goodnight, Case."

She remained silent.

Derek walked back over to the couch and laid down, knowing he would not get any sleep that night. After what just happened, Casey leaving for New York would be for the best. But was it really? This wasn't something they could simply hang in the air for a year and never speak of. They were stuck with one another for life whether they wanted to admit it or not. And the nauseated feeling in the pit of his stomach would forever be present if they didn't sort out what kind of game they had always been playing.

Author's note: Thank you for the reviews so far. Sorry if this chapter made some of you frustrated. Leaving with Roxy just seems like something Derek would have done to save face for what he's really feeling. And of course Casey's going to be angry about Derek in general. But we all know this is a Dasey story :)