I love you more, j'adore.

A/N: Hey there! This is my first fanfiction. I apologise because I only took what I knew from my little watching this show but I thought Derek and Casey would make a cute couple, despite their parents choice. Anyways please read and review! I want to know if ya liked it! And I would like to know if I should put a Casey point of view for a chapter two. Thanks!

I do not own Life with Derek or Derek, Casey and Sam.

I love you more, j'adore.

It wasn't right. The whole idea would seem sick to anyone else but Derek couldn't help the way he felt. They weren't really related anyways. So this wasn't all that wrong, the way Derek loved Casey.

He sighed, thinking this as his last resort. He would never dream of doing this, or maybe he would. Derek slipped into Casey's room. She was asleep, neatly tucked under her covers and laying on her back. Derek watched her chest rise and fall with her breathing. He pressed himself against the door, shifting on his feet. A chill ran up his spine, what if Casey woke up to see him standing there in his boxers and t-shirt? Would she get the wrong idea, or was that just what Derek thought? Inhaling deeply, derek pushed off the door quietly, creeping across the room. He knew Casey was asleep, he been watching her lately, like he had been planning this nightly visit for a while. Derek knelt next to the bed gazing at Casey's sleeping form, the moonlight causing her pale skin to glow. Romantic things were what really got Derek's attention. He watched her, his eyes scanning her body. He had thought about this many times but at this moment his mind was blank. In his thoughts Casey was awake and she knew what was going on. She was in a deep sleep, nothing being able to disturb her from her slumber. Derek crawled onto the bed, putting his knees on either side of Casey. He leaned in slowly before lightly kissing her lips. He then placed a more delicate kiss on her, earning a sigh as she parted her lips. Derek took this as a que to continue as he slipped his tongue inside the hot cavern of Casey's mouth. Casey inhaled deeply, exhaling into Derek's mouth as he pulled away.

He had been jealous of his friend, Sam, being able to have Casey whenever he wanted. Derek wondered what Casey was like in a relationship. He tried not to pry or seem interested in her life as he found it better just to shut her out to keep his feelings from progessing, but his plan failed. Once Derek saw how hurt Casey had gotten over a break up, he wanted to be there to console her, not as her brother, but someone more important.

Casey shifted underneath Derek, her body rising and rubbing against his. Derek moaned softly as he watched as she settled back on the bed and slowly pulled down the blanket. As he uncovered her body, he found her to be wearing the pajamas he had given her for her birthday. A secret gift of a two piece set, with a button-up, long sleeve top and pants with a cute little animal pattern decorating them. Derek smiled, outlining one of the animals that covered one of Casey's breasts. As much as he wanted this moment to last a lifetime, he only had a limited time before Casey would wake up. His quivering fingers found the first button of her shirt as he carefully began to unbutton her top. He exposed more of her skin as he pulled the material away from her chest. His cheeks reddened as it was revealed to him to be totally naked under the pajama top. Derek's hands trailed to Casey's breasts, they were soft under his touch as he lightly squeezed. Casey sighed, her lips parting more as she turned her head. 'Did she wake?' Derek thought, but did not stop. His fingers toyed with her nipples, pinching and squeezing until they became hard. Derek swallowed hard, leaning into Casey again and slowly licked her nipple. Taking the tiny pebble into his mouth, he nibbled and sucked on it. Casey moaned sweetly, arching her body up slowly from the bed. After lightly nibbling and groping her chest, Derek decided to move lower. He moved down her body as he sat up, placing ghost-like touches on her body. Sitting over her knees, Derek dipped his thumbs inside Casey's pajama bottom, pulling at the elastic band and lightly tugging them off. Unlike when he had exposed her top half, Derek discovered a cute pair of pink panties hiding her lower body from his view. He faintly pressed into a slit made by the material. He began to stroke the slit with his fingers, causing Casey to make small noises. Derek began to feel wetness come to with fingers through the panties,'This means she's ready, right?' Derek asked himself, though he had been quite ready some time ago. He uncomfortably rubbed against his pants occationally to stop himself from coming too soon. Derek pulled Casey's panties down and away from her body. He almost choked at the sight of her innocence as it was presented out for him. It glistened in the moonlight. Derek swallowed hard again, stripping off his boxers and tossing them to the floor.

He never knew if Casey was really as innocent as he thought but he was soon to find out. He did not like that he knew Casey would hurt the morning after and to have no explaination. He felt even worse because he wasn't going to tell her if was him that caused her to feel this way either.

But it was too late now, he was too ready to stop and just got to his room. His sleep, if he could fall asleep, would be too unpleasant. Lowering his body, Derek positioned himself and slowly entered Casey's body. She groaned, tears forming in the corner of her eyes. Derek kissed her forehead, whispering an apology he knew she would never hear. He pushed further, feeling her innocence break away as he was fully inside. He lightly kissed her lips before pulling out and pushing in again slowly. He saw the pain in her face but he kept his pace slow to help her get used to him. Casey seemed to relax, her tense body calmed and Derek moved a little faster. The bed began to rock with Derek's movements. Casey softly cried out moans of pleasure as Derek panted, thrusting into her. He felt his peek grow near as Casey wrapped her legs around him. She squeezed him, her voice forming words,"Oh Derek..." She moaned but Derek could concentrate at the moment for time to worry as he climaxed inside of Casey, moaning her name loudly and collapsing on top of her. Panting, he sat up, pulling out of Casey and grabbed his boxers, heading for the door. His hand gripped the handle as he was suddenly grabbed from behind.

"C-Casey." Derek choked, trying to whisper through his apparent shock.

"You were just going to leave?" She asked, tightening her grip around him.

"I...I..." He stuttered, not sure what to say.

"I knew...All along Derek." Casey turned Derek to face her in the moonlight."And I'm glad." She smiled with tears in her eyes."I'm glad."

Derek cupped her chin and kissed her lighty."Thank you Casey." He smiled, kissing her deeply.

Derek went back to his room and fell asleep. Casey rolled over in her bed and did the same. Because their parents were married, sleeping in the same bed was not an option, but that was for another time, another day.

~~The end.