AN: Thanks again for the reviews!!

Disclaimer: I don't own Life With Derek or any characters.

Derek spent the whole night formulating his plan. When he had finally finished he fell asleep, it was two o'clock in the morning.

The next morning everything went normally. All members of the MacDonald/Venturi household got up, ate breakfast and left for their various schools and workplaces.

Derek had an extremely hard time focussing in his classes. All that he could think of was his plan, what could happen if it went right and what could happen if it went wrong. The day seemed to drudge on forever. When the last bell rang Derek was the first one out of the classroom. He ran to his locker, threw his books in and ran out the doors. This was unusual for Derek, after school he generally hung around to talk to people.

Casey noticed the rush that Derek was in. "Emily, do you have any idea why Derek is in such a hurry?"

"I was about to ask you the same thing," Emily replied.

"There's probably some sports event on TV or something," Casey assumed.

----------------------------------------

Once Derek got home he began to clean Casey's room, making sure that he relocked the diary an put it back in the same spot. He was about five minutes into cleaning when Casey came in.

"What are you doing?" Casey asked.

"Uh, cleaning your room, what does it look like?" Derek replied.

"O-Kay," Casey murmured as she walked out of her room. What on Earth is he up to? She thought. There has to be some reason for him cleaning my room straight away.

Once Derek had cleaned Casey's room he went into his room to wait. He was waiting for Casey to go back into her room. She did not disappoint him, walking into her room a mere minute and a half after Derek had left.

Here goes nothing, Derek thought. He took his shirt off, revealing his gorgeous chest. He turned on some music, making sure to crank the volume up extra loud. He figured it'd take Casey five minutes to get annoyed with him and his music. As usual, she would bang on his door and he'd "reluctantly" open it. Soon her banging fist could be heard on the bedroom door.

Taking a deep breath Derek opened the door, hoping that his plan would work. "What do you want?"

"Derek! Turn that music d-," Casey yelled, stopping abruptly when she noticed that her step-brother didn't have a shirt on.

"What's the matter Casey, cat got your tongue?" Derek laughed as he closed the door behind her.

"What are you trying to pull Derek?" Casey asked pointing a finger at him.

"I have no idea what you're talking about," Derek replied coolly.

"Uh, you, d-don't uh." Casey stuttered. Then, deciding that she didn't trust her mouth, she pointed at Derek's chest.

"What? You don't like it when I don't have a shirt on?" Derek laughed easily.

After a few moments of silence Casey spat out, "No, that's not it!"

"Oh, okay, well do you want to play the Honesty Game?" Derek asked, trying to look as innocent as he could, under the circumstances.

"Okay, I guess." Casey replied.

"Okay, first question, do you like it when I don't have a shirt on?" Derek asked. "Remember you have to be honest!"

Casey did not like to break the rules, not even when it was for a stupid little game like this. Resigned to her fate she decided to answer truthfully, but she had a great idea for the next question.

"Come on, are you going to answer the question or not?" Derek asked impatiently.

"Yes," Casey said simply. "Now for your question Derek, why were you so eager to clean my room today?"

Derek had already known the answer to the question he gave her, thanks to her diary, but he hadn't expected her to counter with a question of her own.

"Do you really want the truth?" Derek asked.

"Of course Derek, it is called the Honesty Game!" Casey reminded.

"If you insist," Derek grumbled. "I was eager to clean you room because I had to put something back."

"Oh come on Derek, you have to elaborate," Casey sighed.

"Fine, but you can't get mad at me. Deal?" Derek asked.

"Deal," Casey agreed.

"I wanted to put your diary back. You said you wouldn't get mad at me!" Derek yelled when he saw Casey's angered expression. "I only took it because I..."

"You what?" Casey asked frantically, trying to remember all the things that she had written in her diary.

"I wanted to know if you like me." Derek confessed.

"What do you mean?" Casey asked.

"I wanted to know if you like me like me. You know?" Derek explained.

"Derek, you could've just asked. You didn't have to go steal my diary." Then, remembering an entry she added. "You read the one about my first date with Sam. The one where I wrote something about your chest and... Oh my God!"

Derek grinned. "Yeah, that's kind of where I got the idea for this whole setup."

"This was a setup?" Casey turned.

"Uh, yeah. I didn't expect you to counter with another question." He admitted.

"You know, Derek Venturi, you are a very bad boy." Casey laughed, as she headed towards the door.

"Casey! Wait." Derek caught her arm before she could open the door. "You can't leave."

"Why not?" Casey asked.

"There's one more thing in the plan." Derek admitted.

"And what would th-," Casey was cut off by her step-brother's lips against hers. At first she fought it, but then kissed Derek back.

After the kiss, Casey came back to her senses. "Derek what on earth do you think you are doing? We can't-," Casey was, yet again, cut off by his lips against hers.

"Derek," Casey began once she managed to push Derek off of her. "We can't do this. You're my step-brother."

"Which means we're not blood related," Derek replied.

"Even so, it's still wrong," Casey cried, opening Derek's door and walking out into the hallway.