A/N: Okay, so it's my first fanfic ever. Haha, please be gentle with me. I've been meaning to post this since last summer but I was so busy with school. In fact, I have finals coming up and here I am on FF(dot)net, procrastinating. Anyway, enough of that. I've been wanting to base this story off of Derek and Casey's conversations on Twitter. I love these two! Go follow them if you haven't already: Derek - http:/twitter(dot)com/DerekVenturi and Casey - http:/twitter(dot)com/LifeWithCasey (Just replace the "dot" with an actual dot, but you know what I mean, LOL). I give them the credits to all of the "tweets" I'm going to include here, unless otherwise noted. This is THEIR story and THEIR plot; I just added the stuff in the background that I can't technically see on Twitter.

This is set right after "Vacation with Derek", before Derek and Casey move to Kingston to study at Queen's. If I remember correctly, Casey (LifeWithCasey) said she decided not to go to New York with Jesse. Forgot the reason, have to search the tweets. So, read on and enjoy.

Disclaimer: I do not own Life with Derek. Sadly. And Twitter or the tweets (again, unless otherwise noted).

Chapter 1: When Derek Meets Twitter

Trotting down the stairs to get a light afternoon snack in the kitchen, Casey came down to find an unusually quiet place. No TV, no music, no.. anything. This was not the typical Monday afternoon that she's used to seeing. Did everyone leave without telling me? Scrunching her eyebrows while stretching her neck to search for any life form present in the area, she spotted something – although, she could've sworn this does not exactly fit in the category of "life form". More like, should-not-exist-in-this-world kind of form. She let out a heavy sigh and walked down the rest of the plight of stairs, brushing past this "life form's" niche and stopping right in front of it. Blech - well, this is something, alright. Weirdly, a mild and lightning fast jolt of pain pinched the leftmost part of her chest, and her heart pounded a little. It's as if she just hit a nerve that isn't supposed to be touched. Ignoring this odd sensation, she continued staring at the seemingly immovable person sitting comfortably in his recliner, eyes blankly staring at the phone he was holding on his right hand while his other hand held the remote control which he seemed to absentmindedly wave and wiggle, hitting the arm of the chair occasionally. Her gaze shifted from the distracting motion of the remote to the black screen of the powered off TV, then back to the.. Derek, who's currently doing a good job in the "Ignore Casey" department, making no efforts whatsoever to recognize her presence.

"Take a picture, it'll last longer." exclaimed Derek, after ten minutes of being put into a scrutiny test which made him feel oddly naked for some reason. Not letting his eyes stare up to meet the author of his newly found annoyance – or not really, this is not exactly "new" anyway – he continued pounding his thumb on the screen of his phone, hoping that the large speck of grubber dust will disappear from the face of the earth, or at least from that precious space in front of him. He began to wonder if there's an iPhone app to make an irritating stepsister go away. After all, shouldn't there be an app for everything at this point in time?

"What are you doing?" Casey asked blatantly out of curiosity, dismissing his sarcastic remark and his obviously irritated demeanor. Her eyes focused on his thumb-pounding action, as her arms swung and folded across her chest.

"Since when did my business become your business?" he snarled back, finally lifting his head to face an annoyed-looking Casey who had just change expressions from curious to irked, including some other emotions in between that he couldn't exactly tell.

"I was just asking. You don't have to get all snappy at me," she responded, as he went back to his usual business of oodling on his phone.

"Well, I won't if you start minding your own business," he said while running his thumb back and forth on the screen.

"Well, could you at least tell me where everybody else is?" Casey mentioned, aware that talking to an obviously disinterested Derek will not result in any productivity for the rest of her afternoon. And she likes her afternoons productive.

"No, not really."

"Der-ek!"

Derek rolled his eyes in disbelief and slammed his head on the headrest in frustration.

"Fine," he said, letting out a frustrated sigh, "Edwin, out. Lizzie, out. Dad, Nora, and Marti, out. Satisfied?"

"You are so impossible," Casey said, "I'm trying to have a normal conversation with you here. Can you at least give me a decent answer?"

"Wait, let me think," Derek said, "NO. So, go away already."

Letting out an angry grunt, Casey left the living room and headed to the kitchen to finally get the snack she's come down for. She needed something to cool herself down from the rage that her annoying stepbrother had given her. Thinking that making her favorite strawberry smoothie will ease her thoughts, she reached out for the handle of the fridge. But as she was about to pull the door open, a loud laugh came from where the person she'd rather not think about right now is. The TV is still not on, so she found his sudden outburst weird and somehow alarming. Knowing the usual Derek, he'd be tuning in to some sports program on TV right about now, while munching on chips, cereals, or leftover meatloaf. As much as she wanted to find this new peace-and-quiet in the house comforting and relaxing, it had actually started to make her feel uncomfortable. What is keeping this jerk occupied? He hasn't even devoured this entire box of pizza, let alone, touch it. Closing the lid of the box she found containing half-cold, untouched pepperoni and cheese pizza, she stared at the back of Derek's recliner again, thinking of how and what changed his daily summer routine.

Dismissing the thought in her mind, she continued with what she was about to do. She grabbed a pack of fresh strawberries from the fridge and milk and laid them down on the kitchen island.

Moments later, Derek came barging in the kitchen. Casey, who's half-annoyed at this sudden invasion of personal space and half-intrigued at his short pause of motion, went on with her task of preparing her drink and ignoring him. He eyed her and realized what she was about to make.

To Casey's surprise, Derek grabbed the pack of strawberries from the island.

"Thanks, C," he said, winking at her before making a run for it.

"DER-EK!" she shouted in frustration, accidentally slamming her right hand on the pizza box and squashing the contents.

Back to normal Derek, Casey thought. She didn't exactly know whether to be relieved that he's back to his usual childish, pranking self or extremely angry since said person was also the reason why her hair looked like something that just came out of a horror movie, it being red and all. Just when you think that after the vacation and the "bond" that the family had over at the Great Blue Heron Lodge, the bickering would lessen. The older will be a little more tolerable and the younger will be a little less irritable. Unfortunately, in the McDonald-Venturi residence, such a miracle does not exactly happen - tension does not get resolved after a night of dancing, apparently. Back to reality meant back to the old ways of getting on each other's nerves.

Eager to get out of the bathroom and scream at the culprit, she grabbed the nearest and only towel available and immediately dashed off.

"Der-ek!"

"Whoa there, woman. Okay, I do NOT get paid enough to see you reveal your flesh. Put some clothes on, will you?"

"Shut it, Derek. This is not funny! You changed my shamp-" It took her a few seconds to let the situation register in her brain. She's, after all, standing in front of her stepbrother who barged in her room without permission, not to mention, used her laptop while she was taking a bath. And she's wearing nothing but a towel, but right now, her concern is centered more on his consent-free usage of her personal computer. "What are you doing in my room? Who gave you right to use my laptop? What did you do? Were you snooping at my stuff? Were you reading my private files?"

"Case.. relax, okay? I just needed to go on Twitter really quickly. Seriously, you have some issues."

"I have issues? You were using my laptop! My personal laptop, Derek."

"I told you, I just needed to use it quickly. My computer froze and I can't find my phone, so had to use my final option."

"My laptop is never your option," Casey scowled as she pulled his arm in the hopes that it would remove his butt off her chair. Derek, who felt helpless in his fight to regain position in front of the computer for the last time, struggled to leave a large amount of space in between his body and her towel.

"Stay away from my stuff and stay out of my room!"

Derek was about to say something else, but her door approached his face faster than he could utter a syllable. "Damn."

"There is never a privacy in this place!" She screamed as she shut the door after kicking him out. It's not that she really minded him hanging around and barging in her space every once in a while – or every single day, really. It's the fact that he was a click away from reading things that no one was supposed to read, not even him, especially not him. Desperately finding an outlet for her sudden emotional build up, she shifted her focus on the LED light of the monitor of her unintentionally opened laptop which she now found irritating. Striding towards her desk, she's about to shut it down when she noticed what Derek forgot to close or actually log out of – his Twitter account.

| DerekVenturi: Casey's screaming right now. I replaced her shampoo with ketchup and her soap with butter. Derek = 1, Space Case = 0. Heh!

"That twisted, arrogant, self-centered jerk! Did he really have to post this for the whole world wide web to see!"

Well, two can play that game. Casey thought as she hit the "Sign Up" button, not knowing exactly what she's signing up for or what use it would be for her life. After all, she's not that much of a fan of social media sites. She maintained a simple blog, but that's about it when it came to online interaction. What would be better than good old classic diary-keeping where thoughts flow with every swish of the pen? Whatever Twitter is, she'd figure out later, but if Derek has one, it's only natural that she has one, too.

| LifeWithCasey: I figured I need a twitter in order to a) annoy my stepbrother (at)DerekVenturi & b) make sure he wasn't posting embarrassing things about me!

Rather pleased with her short post, she let out a sly smile as she signed out of the website. Two.. can play that game.

A/N: Sorry, it's really not that eventful. But I hope it gets better in the next few chapters! I need to figure out how to do the changing POV too. Maybe I'll include more intro/background on the next chapter. But yeah. So, let me know what you think so far.