Butterfly Effect

Prologue: 10 years ago

A couple of things made that day more memorable than I had imagined. But not in a good way. It was my eighth birthday and also my twin sister's, Chelsea. We were having a party to celebrate.
It was supposed to be one of the happiest days of our lives but... it wasn't, for me at least.
My sister watched the guests walk in to our mansion from just a few feet away from the main door. I watched the guests as well, but from the stairs, as I walked down from them.
Chelsea was always happy. She liked bright colors like her curly blond hair, and the pearl-white dress she was wearing. She always smiled at everyone, and treated them so nicely.
While I was always so emotionless. I liked dark colors like my dark blue hair, and royal blue dress. I only smile at my family and no one else. And I always scoff at people who aren't my friends, not that I'm saying I have any, or who I didn't know.
Sometimes I wonder how we were even related to each other. We were always so different. But I knew one thing... my sister kept me sane...

When the party started, Chelsea started to greet everyone who came, while I just gave a half-hearted wave. Everyone put their presents on the big long table in the middle of the room, and went over to us to give us a "Happy birthday" greeting. Of course, Chelsea always said "Thank you" in the most happiest way possible. While I always just said it in the most emotionless way possible.

"Hey," Said Chelsea as she came over to me. "Why are you acting like that again? It's our birthday." She smiled.
I sighed. "Chelsea," I said to her, with cold, emotionless eyes. "I'm always like this. I just can't understand how you're still not used to it."
"Well, you are my sister," She said. "For once, can't I just see you happy? It would be the greatest birthday gift you can ever give me!" She gave me puppy eyes as she begged.
I sighed once more, but I gave in. I smiled whole-heartedly at her, then dad came over to us, and my smile disappeared.
"Hello, girls," Said dad.
Dad was always in his lab coat. Which annoyed me so much! I know he's a scientist and everything. But does he have to wear that... stupid coat everywhere?!
"Hey, dad!" Said Chelsea.
"Yeah... hey..." I said.
"Oh come on, Eve. Where'd that actual happy smile you had go?" He asked, with a slight smile.
"Just stop dad..."
"Well, sorry to cut this conversation short," Said Chelsea as she put on another smile. "But I have more guests to greet. I'll see you both later!" She ran off to the crowd of people, making sure which ones she hadn't greeted yet.
"Well, since your sister's distracted... I might as well tell you that your mother wants to have a private conversation with you in the kitchen." He said, in a very serious tone.
"Why?" I asked.
"Just go..." He answered.

In the kitchen, I saw my mother. She was sitting on a chair at the dinner table, and looked at me with sad eyes.
For once I actually felt... worried for her. For someone.
"Mom? Is something wrong?" I asked, in a fully caring and worried voice.
"I'm just... w-worried for you... and your sister... it's just..." She stopped to wipe the tears on her cheeks.
"What mom?"
"Just... please... promise me one thing..." More tears streamed down her cheeks. "Promise me, that you'll protect your sister. That you won't let anyone hurt her, and you hurt her."
"Why would I hurt her?!" I asked, in complete shock. I may always be emotionless, I may always be mean to people I didn't know, and yes I may have always scoffed at people. But I would never think of hurting my sister! "Why would you even say or ask something like that?! I'm not like that! She's my... my... sister... I'd never hurt her..." Tears started to strean down my cheeks. Just the thought of my sister suffering, made me gag.
"It's just that, you're so much like you're father..." She answered.
I was confused. I know I'm a lot like dad but... what does that have to do with anything about this?
"What does that have to do with anything at all?" I asked, with a confused expression on my face.
"You're father, is not the kind of scientist you think he is," She answered, and looked down while more tears streamed down her cheeks.
Then she looked up, with a dark expression on her face.
"You're father, is a insane, psychopathic, killer!" Her face got darker. "He's not to be trusted! He uses people for his experiments, and doesn't even give mercy to them!"
When I heard her words, I felt my face make a dark expression. How could he be like that? He's always been so nice to us... unless... he was just faking it. Faking!
"Mom, does he know you know this?"
"No," She answered. "But please, promise me you'll keep your sister safe from him, from other people, and from-"
"Me?" I cut her off. "Are you saying I'm like dad...?"
She made a shocked yet scared face. As if she thought that I could kill her at any minute. That I would snap if she said one wrong word. Or that I would turn wild with the slightest touch.
"What?! No! Of course not." I wasn't completely sure, but I felt like she was lying. "Just please, promise me you'll protect her from any harm."
At some point in our conversation, I felt like I was being called a psychopathic killer already. But what she was asking me to do is my about my sister. So I couldn't possibly say "no."
I gave a heavy sigh, and said, "I promise," I made a serious face. "I'll protect her with my life."
Mother stood up from her chair and kissed me on my forehead. I knew she meant that with love. But being the kind of person that I am, that kiss meant nothing.
"Thank you so much." Mother hugged me and wiped away all the tears she had on her face. I could tell she was happy again, I wanted to give her the same kind of happiness in return, but all I could give was a slight smirk.

On that very day, I've always wondered what would happen in my future. In my sister's future. But I knew only time would be able to tell. Only time... would be able to tell.