Author's Note: Okay, votes have beencounted and I've decided that because of my generous reviewers, I shall continue with this fic. I know the chapters are kinda short but I will try to make up for it by updating frequently. That is, if I know that people are actually reading! Thanks and enjoy :-)

"Casey!"

Derek's head snapped over at his best-friend, who was flagging over his new girlfriend from across the cafeteria. Derek's eyes narrowed instantly.

One thing he could always count on was having lunch every day in school with his best-friend… without Casey. So what the hell was Sam doing calling her over there during their guy-time?

Casey jogged over to the table, smiling brightly at her boyfriend. Derek tried not to notice how happy she seemed to be with his best-friend.

"What's up?" she asked coolly.

"I was just wondering if you wanted to go out to dinner tonight with me," Sam smiled slowly at her.

Derek's shoulders tensed and he stared down at his lunch so he wouldn't make any dumb comments. And wouldn't have to look at Sam's goofy "I'm-Casey's-Boyfriend" face.

"I thought we were going out tomorrow night," Derek heard Casey respond.

"Well… we can go out both nights… I mean, if you want…" Sam said almost nervously.

Derek had to fight not to lose the lunch he had already partially eaten.

Casey gave a flirty laugh that made Derek's jaw muscles tighten. "Sure, Sam," she giggled and, unfortunately for him, Derek looked up just in time to see Casey give Sam a peck on the lips.

"Can you guys NOT do that in public?" Derek growled irritably.

Casey just threw Derek a stony glare. Her eyes softened as she looked back at Sam. "I'll see you later, Sam."

"Later," Sam replied with that goofy grin again as Casey sashayed back to the table she was sitting at with Emily.

Great. Another night of Casey-Sam. Thinking quickly, Derek let his eyes scan the room. He set his eyes on Ashley, a cute little blonde vixen he had yet to sink his teeth into. A perfect night for her.

"Hey, Ashley," Derek called her over smoothly. The blonde in the top that was three sizes too small for her and over-the-top eye-make-up bounced over. Whenever Derek Venturi beckoned, the girls would come.

"Yeah, Derek?" she asked, giving him a flirty smile as she chewed obnoxiously on a piece of bubblegum.

"How about the two of us get together tonight?" Derek offered with his charming grin. Of course, no girl could resist him. Well… almost no girl…

"Sure!" Ashley exclaimed excitedly.

Derek smirked. "Cool. I'll pick you up at six, okay?"

"Uh-huh," Ashley popped her chewing gum and grinned before bouncing back to the cheerleader table to tell all of her friends.

Derek looked over at Sam triumphantly. If anyone could get his mind off of his confusing feelings about his stepsister, it would be Ashley.

He popped his collar once and smirked into the mirror. He looked good, as always. Feeling confident as always, he opened his bedroom door and jogged down the stairs two at a time.

And he stopped completely when he saw his stepsister. Casey. In a dress that shouldn't even be legal.

It was strapless and tight, showing off an abundance of new cleavage clearly brought to you by a push-up bra of some sort. It was short, much shorter than anything he had ever seen Casey in, and showed off her long legs impeccably. Her hair was loose but curled with a bit of a wave. And she had make-up on… not too much, so she still looked like Casey. But enough to give her this alluring, mysterious look that could drive any guy wild.

And wild was what it was making Derek.

"You're not wearing that!" he blurted, his eyes not able to be peeled away from Casey's sexy outfit.

Casey glared at her stepbrother. "You can't tell me what to do!" she shot back. Smoothing her dress down with her hands in a way that Derek felt was extremely enticing, Casey asked, "Do you think Sam will like it?"

Derek could only stare at her hands moving down her body slowly, almost erotically. He had to get out of there before his tightening pants gave away how he truly felt about the dress.

"I gotta go," he said quickly, "I have a date." Tearing his eyes away, he bolted out the front door before Casey had a chance to say another word.

As he walked to Ashley's house, all he could think about was how Sam got to spend the evening with Casey in that tight little outfit.

It wasn't fair. Sam didn't deserve her. He deserved someone… well, someone goofy and awkward like him. Not someone like Casey.

Oh, God, Casey…

Derek had never seen anybody look so sexy in a dress in his life. And he had gone out with a lot of girls in his time.

He wanted her in that dress. Well, actually, he wanted her out of that dress. With it on the floor of his bedroom. With her under him, naked and begging for him. Writhing around his bed with her small frame and moaning out of those plump pink lips of hers.

Sexually frustrated, Derek ran his trembling fingers through his messy brown hair as he approached Ashley's house.

He had to stop thinking about his step-sister like this. Whatever it took, he just had to get the X-rated Casey thoughts to stop.