Okay so I have never done a life with Derek fic so I hope everyone likes it.

Summary: Life in the McDonald/Vinturi house is always an adventure, Marti is still curious, Edwin and Lizzie are still quirky, Derek is still the Jerk and Casey is still neurotic, but Casey has a secret that will change the course of her relationship with the one person she'd never expect to get help from. Can he save her before it's too late?

Warning: Mild Cursing, some graphic sexual content in later chapters. Several Inside Jokes.

Dedicated to: Michael (Tato)

Disclaimer: I don't own anything except the story plot.

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December 23rd 2007

"Are you going to tell them?" the low hum of a dimming light was heard echoing the white hallways that held a soft melancholy glow. The bright yellow door that was opened slightly held the figures of two people seated across from each other. The room wasn't that big or welcoming; degrees of the doctor's graduation and profession were hung on the wall, the dark oak desk was cluttered in paper and a gold tag read the name Dr. Alan Sterwick.

He was a middle aged man of approximately forty-two years of age. His face held small wrinkle lines at the edge of his lips, his eyes were forest green were playful yet held maturity, a soft gentleness played in them as he starred at the young girl sitting across from him. Her eyes were casted down, her hands fidgeted slightly, her breathing was slow, and her demeanor was slumped.

"No…Not yet"

"But…."

"Dr.Sterwick Please, it's my decision. I don't think they're ready for this…." The room fell silent a moment, a single tear rolled quickly down her face. "Not yet anyways."

"You don't have much time." His voice was soft; he spoke to her as if he was speaking to his own daughter her age. Her eyes looked at him, and she smiled.

"I Know"

"You need treatment if you want to fight it."

"I know"

"You can't do this alone."

"I know" her voice would drop several octaves as she spoke, falling deeper and deeper into a whisper. But her eyes continued to look at him, and he saw the sadness that took residence there.

He looked at her a moment longer before taking out a pad and writing down a prescription, his hand writing seemed like a bunch of whirls and loops but he was sure she would understand it. Ripping the paper from the pack he handed it to her.

"Take these two times a day." She said nothing taking the piece of paper silently. "You are not alone." He began, her eyes looked at him. "Until you are ready to tell them, I will be here to support you."

"Thank you Doctor"

"Be back here next Monday and we'll start the treatment." The young girl nodded at his words. She stood up she made a movement for the door but stopped upon hearing the doctor peak once more. "Casey don't, live your life any differently…." She didn't say anything her eyes said it al, looking back to the door a smile on her lips.

"I won't" and with that she walked out of his office, the small white paper clutched in her hands tightly, refusing to read it's contents yet.

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Present Day

"DEREK VENTURI!!" the sudden rather loud shout that echoed through out the two story house, let the people living in it know that something was about to happen. A messy semi-long brunet head was poked out of the room two doors away, a sly smirk playing on the lips of the handsome faced teenager, obviously satisfied with what he had done to annoy his step-sister yet again.

And in affect his smirk grew wider when his step-sister's door flew open and she came out seething with what seemed to be a bright pink lacey undergarment; her eyes threw a multiple amount of daggers in his direction before she stormed over to him flashing the hideously pink thong in his face. Her eyes looked at him as if expect him to give her a straight forward answer but when he just stared at her, she groaned loudly.

"What in god's name is this doing in my room!" her voice was peeking higher and higher in her anger, and Derek simply enjoyed the show, loving to annoy his new sister profoundly.

"Casey I don't have the slightest clue as to what you may mean." His voice came out in the most innocent way that it almost made Casey gag.

"Don't you dare play dumb with me" she said her clear blue eyes held irritation in them.

"Who's playing?"

"I know Trish was here three days ago, I know because when I got home she left with a huge smile on her face!" Casey began, her blue eyes starring into Derek's Chocolate colored ones. He could have sworn she took a step closer when her face seemed to lean in on him.

"Yeah so?"

"SO!" she stopped a moment, closing her eyes and exhaling slowly, when she opened them again he saw something he couldn't quite figure out. "So I would appreciate it if you didn't fuck people in my room" she said in her normal voice yet with venom seeping from the side of her lips. Derek smirked and leaned in closer to her.

"Nah it's too much fun in your room" When the words left her lips she almost yelled out in anger, instead she flung the pink garment at his face, her fist clutched tightly as she huffed.

"You are the most……"

"Good-lucking and irresistible man I've ever meet?" Derek suggested.

"Good for nothing, irritating, immature asshole I've ever meet!" Shot back at him, but he seemed to take that comment pretty well too.

"Oh in that case I'm good" Casey just stared starred at him a moment before turning her heels and walking back to her room, slamming the door in the process. Derek simply smirked, it was good to get something out of her this early in the morning, and with that thought he went back into his room and closed the door.

Casey leaned against the door of her room, her breathing came in short pants, and she could barely breathe. Her eyes darted to one of her drawers and she quickly made her way towards it, opening it she took out a small orange bottle; opening it she took out two pills and put them into her mouth, a water bottle sat on top of the dresser; opening it she swallowed the pills and water down. She needed to calm down, at some point during her argument she felt dizzy, resulting in her closing her eyes and trying to calm down.

These sudden peaks in her mood were dangerous for her health, or so the doctor had said. Turning to the clock she sighed, she needed to get ready for school, moving away from the dresser she went on to get dressed, the person who starred back at her in the mirror was the ghost of who she was. She had felt her body weaken considerably fast over the past three months, yet the person in the mirror still looked healthy with a soft pale hint here and there, but nothing seemed out of the ordinary, not yet anyways.

For the past three months she had dealt with the illness on her own, well with the help of the Doctors and Nurses who were extremely caring and supportive. She went to therapy once a week without delay and things were supposedly getting better, but she knew that there was more than that going on. She felt it, and she had still to tell her family about it, they were too preoccupied with the coming for her new little brother, they were all so happy that she was afraid to spoil the happiness by telling them what was wrong with her.

She hadn't even told Emily or Paul the guidance counselor, she had not told a soul about it, the only ones that knew were the Doctors and Nurses in the hospital who were helping her. She knew sooner or later she would have to tell them, but not now. Her mom was five months away from giving birth and she wanted her mother to concentrate on the baby and giving birth, besides even if she didn't make it God was giving her mother another child that would take her place.

Sighing she sat on her bed, the small bottle of pills still in her hands and all she could do was stare it, she remembered the day she was diagnosed, she was sick and went to get checked by her doctor and somehow winded up at the hospital for a blood test, when Doctor Sterwick sat down the look on his face was solemn. He looked at her and told her the bad news.

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"I'm sorry to say this Casey" His voice had been soft and the hurt in his green eyes told Casey something was about to go terribly wrong, but she stayed silent and listened to him, not wanting to jinx herself or make the slightest sound. "You have Leukemia." Casey felt her heart stopped at that moment and the wind get knocked out of her completely.

"W-what?"

"Acute lymphoblastic leukemia to be exact" His words hit her hard and fast. All she could do was stare at him but she reacted.

"What is acute lymphoblastic leukemia?" she asked her voice breaking slowly as she let it really sink in.

"It's a type of Leukemia. It's a Malignant, immature white blood cells that continuously multiply and are overproduced in the bone marrow"Casey let the tears falls as the doctor spoke, she had felt so broken, just recently she'd been happy to know she was going to have a little brother and now she felt so lost. "Casey go home tell you're parents…I'll have you meet with me in about a week to discuss your treatment."

She didn't answer she had simply gotten up and left.

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That day had marked a time limit for her life and completely changed her views on life but she had kept her promise to the Doctor and lived her life as if nothing had happened. Well at least in front of everyone else she did, but when she was alone in her room she sat and thought, sometimes she even cried feeling alone.

"Casey! Are you done we have to go soon!" Derek's voice brought her out of her stupor, exhaling sharply she stood up and walked to the door. Swinging the door open she glared him, her eyes held irritation as she stared into his dark brown eyes. "Are you ready or not?" his voice sounded as annoyed as she looked. Rolling her eyes Casey picked up her bag that was sitting next to the door and walked out without a word to Derek, not really in the mood to be bothered.

Derek didn't think much of it seeing as Casey had irregular mood swings. He simply strolled past her and down the stairs, where Nora and his dad were having breakfast. One look at his stepmother's belly and he smiled knowing his new sibling was coming soon. Casey followed soon behind him; a smile grew on her lips as well.

"Good Morning Casey…Morning Derek." Nora's voice had taken a much more motherly tone since the pregnancy and everyone loved it things in the house was much more peaceful and Derek and Casey's fight weren't as violent now.

"Hey mom it's Monday, remember I do my community service hours at the hospital so I'll be home late." Casey took a piece of toast began to eat it plain. Derek was in the process of gulping down his personal carton of milk. The whole family had given up on him a while back and bought him his own carton of milk; Casey simply rolled her eyes and stood up.

"Oh well we can go together" Casey nearly choked on her toast at her mother's words; George patted her gently on the back. "Casey are you okay" her mother's voice sound alarmed but Casey brushed it off

"Yeah I'm fine, why are you coming with me?" Casey ignored the quizzical looks coming from her family members; she was more interested and desperate to know why.

"I have an appointment with my Doctor."

"Mom don't you go somewhere downtown for check-ups?" Casey asked as she bit once more into her toast.

"Yes but I have a new doctor now." Casey nodded and poured herself a glass of milk, picking the glass up she looked at her mother?

"Who is it?" she asked then began to drink her milk.

"Oh George what was his name…" Nora snapped her fingers as if that would help her remember. "Doctor…um Sterwick?" as the words left Nora's lips Casey found herself choking on the milk, since she refused to spit it out. George pat her on the back once more as she gasped and whizzed for air. Casey coughed violently, her mouth covered by her hand as she attempted to regain her breathing.

"Casey! Are you okay?"

"Yeah, I-I'm fi-ne" she coughed out as she stared at her mother. "Doctor Sterwick is it?" She asked quickly changing the subject but she felt Derek's eyes on her.

"Yes he was recommended to me by a collogue of mine, he says the man is a genius, studied two fields of medicine you know. I've already met him once, he's a real sweetheart."

"Really?" Casey wanted to kill someone but she knew lashing out at Derek unexpectedly would cause suspicion. She was going to kill that man when she had the chance, he probably did it on purpose and even if he didn't she was going to blame him for whatever caused her mother to meet with her Doctor. Her mother went on talking about how great her new Doctor was and all Casey could do was fantasize about killing the guy in the most painful way possible.

"Okay Nora we got to go." Derek's voice broke through Casey's thoughts making her look at him. She looked at the clock on the microwave and nearly choked again at the time it was.

"Oh My GOD! Mom I have to go!" she exclaimed as she jumped off her chair.

"Casey I'll pick you up today so we can leave together."

"Yeah okay mom!" with that she rushed out of the house with Derek starring at the spot she had been at only moments earlier, that girl never ceased to surprise him.

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Okay I hope you like tell me what you think and if I should continue. REVIEW PLEASE!!

Jme