A/N: This is my newest fic, Little Miss Mary Sunshine. It's going to be mostly in Casey's POV, with a slight insert of Derek POV in chapter 7. This will be eight chapters long (chapter 8 will be an epilogue). It's a song fic with a couple lines from the song as an inspiration for the chapter. I was very happy with all the positive review I got for my other LWD fics! Thanks a bunch for taking the time to review! I love it! Please R&R! Thanks! –Mac

Disclaimer: I don't own Life with Derek. I also don't own the song 'Mary' by Saving Jane, but I own one of their CD's and I love it!

Chapter One

Bad Day

Little miss Mary sunshine

Had a bad day…

It's the little things, I think, that add up to make a bad day. It is for me most of the time, at least. Of course one big thing could happen and ruin your day. Like your dog dying, or your boyfriend cheating on you. Or catching your boyfriend cheating on you. Now that one's a whopper. For me, usually, it's a billion little things that just push me to the brink of explosion, but never all the way over the edge. Today was different. They started small and each new thing just got bigger and bigger. I think I could honestly say this was probably the worst day of my life.

I woke up late. I guess I snoozed my clock one too many times without even realizing it. Then I had to wait for Derek to finish in the bathroom which took I don't know how long. The arrogant jerk took longer on purpose I just know it. Then when I finally got access to the bathroom, I discovered that Marti had used all of my things to make potions, again.

Then at breakfast, Derek drank the last of the milk, straight from the carton. He gave me the classic Derek smirk and put the empty carton down in front of me, next to my bowl of dry cereal. When I tossed the cereal and opted for some toast I was distracted by my Mom racing through the kitchen trying to catch Marti to dress her for the day, and it burnt. Finally I decided against having breakfast, and left for school.

At school, as I tried to vent my frustrations to Emily at the very mention of Derek, she went into a trance…Ugh. It was normal for her, and if my day hadn't have been going so well already, it wouldn't have bothered me. But I was already frustrated as it was, and she didn't help. I slammed my locker shut with an exasperated grunt and headed to class, leaving Emily with a confused look on her face.

Most of my classes passed uneventfully, thank God. Except there was the time I got in trouble for passing notes because Emily insisted on tossing me every five seconds when I wouldn't tell her what had put me in my mood. And the teacher gave me detention. I was having such a lovely day.

Then at lunch my wonderful stepbrother oh so accidentally dumped half his lunch in my lap. To say I wasn't so thrilled would be an understatement. It caused a huge blowout fight, which we usually saved for use at home, in the middle of the cafeteria. Usually when we fight at school Sam, my boyfriend and his best friend, or Emily would attempt to break it up. No such luck this time. Both were pleasantly absent.

I was on my way to the bathroom to try and clean up the mess Derek had created when it happened. I was passing a janitor's closet on my route to the bathroom. The door was wide open and they were never open unless the janitor was in it. But as I passed, what I saw was definitely not the janitor. Most definitely not the janitor. The door must have slipped open after being hastily, and not properly closed by the current occupants. I could have screamed. I could have cried. I could have punched him and her. But I didn't. I just finished my walk to the bathroom as I began to absorb what I had just seen. Sam. Sam and…Sam and some blonde! Sam and some blonde making out. Sam and some blonde making out in a janitor's closet. Sam and some blonde making out in a janitor's closet when he was supposed to be spending lunch with me, his girlfriend! Instead he was with some blonde, who wasn'this girlfriend, in a dingy old closet. Could my day get any worse?

The tears finally came as I hunched over one of the sinks in the girl's room. I just stood there, crying my eyes out. Everything from the day finally caught up with me as I stood there. All the little things seemed so much bigger now as they piled onto my shoulders, weighing me down. Somewhat distantly, I could hear the bell ring for us to return to class. I wiped at my eyes furiously, then splashed some cold water on my to try and soothe my probably swollen eyes. Then I tried to go on with the rest of my day like nothing happened. Yeah, right. Fat chance.

I went through my remaining classes in a daze. I didn't know what to do. I didn't know what I was feeling at the moment. It was just too much at once. Emily caught on really quick that something was really, really wrong, even more so than that morning. She tried to pry it out of me, but I couldn't even attempt the words. She wouldn't understand what I was feeling. She couldn't help me. So I blew off her questions and refused to answer.

Then I had to go to detention. Of all days for me to get a detention. I could barely deal with it all as it was. Now I had an extra hour to let all the horrible things stew. I had an extra hour to think over everything that had happened to me today. An extra hour I could have done without. I felt bad enough as it is. Now I had a chance to think about just how bad it is that I felt.

I was emotionally exhausted when I arrived home that evening. The last thing I needed was for Derek to get in my face. But of course, he did anyway. I was surprised that he actually noticed I wasn't myself. He actually realized I was a bit down—a lot down—not that he actually sounded concerned when he revealed that to me.

"What happened to you? You look horrible." Derek commented, catching up with me on the stairs as I headed for my room.

"Could you just leave me alone? Please?'' I pleaded. I really didn't need his garbage right then.

"So how's it going with Sam?" Derek questioned. I whipped around and I think he could tell from the look on my face that I was really upset, because he added in a more concerned tone—a shock seeing as it was Derek—and said, "Casey, what happened?"

"Don't you know? He's your best friend."

"Yeah, but he's your boyfriend."

"Not anymore."

"What?"

"You know, why don't you ask him? Maybe you could do me a favor…find out who the blonde bimbo, that he was making out with, is for me."

"Huh?"

"Confused? Yeah, me too. But I bet you're happy now, you never did want us together. Now you've got your way again Derek, we're not."

"He did what…with who?"

"He was making out with some blonde at school. I saw them when I went to clean up the mess you made when your lunch ended up in my lap. So, it's over. You win."

"Wait Casey!" Derek called just as I was about to go into my room, and I stopped. "Are you sure? Did you talk to him? Did you say anything to him?"

"I saw them, so yes I'm sure. But I didn't talk to him. I didn't say anything to him. Not yet." I answered, "I thought he was different. I guess he's more like you than I had thought."

With that I slipped into my room, closed the door, and locked it. I fell onto my bed and stared at the ceiling. When I couldn't stand holding it in anymore, I let the tears go again. They slid down my face and pooled on my pillowcase. I didn't understand it. I couldn't understand it. I should have been able to understand it.

Sam was the sweet one. Sam was the one who opened the door for me and pulled out my chair when we had dinner. Sam was the good one. When I had met him, I couldn't figure out how he was friends with Derek. Sam was the sensitive one. Sam was the caring and kind one. He doesn't do this kind of thing. He's not the one who cheats on his girlfriend. He's not the one who could hurt me this badly. He shouldn't be capable of causing this kind of hurt. Derek did this kind of thing. But it was Derek that seemed to be sort of concerned, in his own way, just moments ago. I just didn't understand.

I was confused as hell, and it didn't look like I was going to get any answers anytime soon. Things weren't going to change on their own. Someone had to change them. If I wanted things to get any better than today I would have to change them. I had finally been pushed over the edge. And to think it started with a late alarm clock, some spilled hair spray and lotion, and burnt toast. I had experienced the worst day of my life. I decided I wasn't going to have anymore bad days. I was through with bad days. Over and done with. I would have better days from now on. And I didn't care what I had to do to get them. I was finally going to get what I wanted…if I had to take it for myself. Things were going to change…if I had to make them change myself. It was my turn and I was definitely taking it.

A/N: Thank you for reading my new story…I will update as soon as I can! Please review! I would love you if you review! Thanks! Love ya! –Mac