Okay so this is my first story ever on here. I hope y'all like it!

The way she smiled. The way she laughed. Everything about Casey McDonald was perfect. Perfect for any other guy but him. He was her step-brother. He was supposed to tease her and make her mad and that's it. So why did he get butterflies in his stomach every time she said his name?

"Derek, I want you to stop being so rude to Max," she was doing it again...saying his name.

"Get real Casey. That's never going to happen."

"Max is my boyfriend, Derek, and he comes over here quite often. It wouldn't kill you to at least be civil to him."

Derek winced at the title 'boyfriend.' "Case, that just might be too much to ask..." Why did she look so good and smell so good?

Casey was wearing a pair of tight fitting jeans and a scoop necked tank top that hugged her curves in all the right ways. Her hair was perfectly straight and she had a conservative amount of make-up on. Yes, she was perfect and Derek really wanted to reach out, take her in his arms and kiss her peach flavored lips.

"Look, Case, I think you should just dump the guy. He just doesn't seem smart enough for you," that was the understatement of the year and as far as Derek was concerned, no guy was smart enough or good enough for that matter for Casey.

"Whatever Derek, Max is coming over tonight so you better behave!" and then Casey walked out of the room leaving Derek with his thoughts.

"How did I know what flavor lip gloss Casey wore? And why do I even care?" Derek thought to himself as he sat down on his chair and flipped on the T.V.

Marti ran downstairs and jumped beside Derek. "Derek, let's play dress-up!"

Derek rolled his eyes at his little sister. He really didn't want to play dress-up tonight especially with Max coming over. He would watch that guy like a hawk. "Marti, Casey's friend - eh boyfriend is coming over tonight. We shouldn't play dress-up."

"What's his name?" Marti asked.

"Max"

"Casey and Max sitting in a tree..." Marti ran off singing the song through the house.

Derek cringed at the song Marti started singing. Casey and Max doing anything together sounded awful to him.

Max and Casey were sitting on the couch, watching a movie. Derek had propped himself in his chair and would not leave for anything. He didn't even know what movie the couple was watching, he was too busy watching Max and making sure his hands didn't go anywhere they weren't supposed to go. So far, so good. In fact, Max wouldn't even touch Casey with Derek in the room which made Casey very mad. But she wouldn't let Derek know that. Finally, the movie was finished and Max got up to leave.

"Well, Casey, it's been great. I'll call you tomorrow," Max leaned in for the kiss but saw Derek and kissed her on the cheek instead of the lips. Then, he walked out the door and left.

"Thanks a lot Derek. Not only did you ruin my alone time with Max, but you ruined our goodnight kiss."

Derek looked at her for a moment. She really was beautiful. If only they weren't step-siblings, they could be together. It could be Casey and him watching a movie together. Casey giving him a goodnight kiss.

He placed his hand on her face, trying to be rude about it, but it came out soft. "Sorry, Case, but this is my house too and I wanted to watch the movie." He then ran off to his room, afraid of the thoughts that were playing in his mind and how he wanted to kiss her.

Casey just stood there watching Derek run up the stairs. He made her more mad than anyone that she knew. He also left her feeling dizzy after he touched her, especially when he put his hand on her face like he just did. Casey lifted her hand to feel the spot when she realized she was just being silly. There was nothing different about the way he had just touched her. And the only reason she got dizzy was because she was so angry. Yeah, that had to be it. Feeling relieved she headed up the stairs and into her room.

The weekend went by normally. Derek tried his best to act like Casey was annoying while thoughts of how fantastic she was plagued him. On Sunday, George, Derek's dad, and Nora, Derek's step-mom and Casey's mom, decided that the family was going to go to the local health club after breakfast. Derek was not thrilled at this idea but they had a hockey rink there and he could spend his time practicing for the big game on Wednesday night. Lizzie and Edwin were going to play soccer in the field outside the health club and Marti was going to go swimming with Casey.

After breakfast, the kids went to their rooms and changed into appropriate clothes and came back down. Derek was the first one ready. He had all his hockey equipment and was sitting in his chair waiting. Lizzie and Edwin followed after. Then, down came Marti and finally Casey. She walked down the stairs in a brown and pink striped bikini with a cute cover up. When Derek looked up at her, he nearly stopped breathing. She looked amazing. Her hair was in cute loose pig tails and her body was very tan.

"I changed my mind, I want to go swimming too," and Derek ran upstairs to grab his swim trunks.

Hmm...wonder what's going to happen when Derek decides to go swimming with Casey? Will his Dad and Nora suspect anything? What will Casey think? Please read and review!