A/N: Well, this is an idea I just came up with. I don't know how well it'll play out, and it's gonna be really difficult to write. But here's the main idea.
Basically, the roles of Tris and Tobias are switched. Tris is two years older, and she leaves Abnegation to escape her abusive mother. Tobias transfers because he knows he doesn't belong, and Tris is his instructor in Dauntless. The first chapter is going to be Tris's choosing ceremony. The rest, well, I guess we'll find out.
Let me know what you think.
Without further ado, here is the first chapter.

Chapter 1

Tris

I leave the aptitude test room shaking with relief. I didn't expect to get an Abnegation result; I expected at least two of the five factions, if not more. Because I am Divergent. And the only other person who knows about my Divergence is my mother, Elizabeth. The past few years, Elizabeth has been "training" me to receive an Abnegation result. Our training sessions involved a lot of yelling on my mother's part, and a lot of crying on mine.
But, whether I like it or not, they did help. They helped me hide my Divergence. A Divergent simply means that you are wired for more than one faction. At first, that might seem like it's not a bad thing. And to most people it wouldn't be. You see, if your mind cannot adapt to one way of thinking, you pose a threat to the faction system our city has come to know and love. And in our city, threats are eliminated. Therefore, being Divergent is incredibly dangerous. I don't know how my mother found out that I am Divergent, but I remember when she did as if it were yesterday.

*Flashback*

I am in the kitchen cooking dinner for my mother and I, when I hear the front door slam. That can't be good.
I continue to prepare supper, like I've done ever since Father passed away, until Elizabeth stomps into the kitchen. I turn to her. "Hello, Mother. How are you?" It kills me that because I am Abnegation, I have to be polite to the person I despise more than anybody. And I know that if I'm not polite, the beatings will get worse. Elizabeth stares at me before sitting down at her place at the table. "I've been better," she states, and doesn't ask me how I'm doing. She never has, and I'm sure she never will. I nod and turn back to my cooking. I fill two plates with a pile of peas, one chicken breast, and mashed potatoes. I put a spoon full of butter on top of Elizabeth's potatoes, but not my own, because it would be self-indulgent. My mother doesn't care if she is self indulgent. And usually, she isn't. Well, the her she shows to our city. The real Elizabeth is a monster. On the other hand, I am punished for the slightest slip from the Abnegation ways. It's usually the belt, but sometimes she just uses fists or feet. Each time she beats me, she tells me the same thing seconds before the first whip. "This is for your own good, Beatrice. I'm just trying to make you better."
What I don't understand is how beating a lifestyle you yourself can't adapt to, is going to make me better. I wish I could let the world know the real Elizabeth Prior. But if I tried, she would kill me.
My mother is a leader of our city. She is known as the model for Abnegation; the most selfless and caring of us all. But inside the walls of our house, she becomes a completely different person. A child-abusing, psychotic, sadistic, power-hungry woman. I set her plate in front of her, and sit to her left. She grasps my hand in hers, and I have to restrain my self from flinching. She thanks God for providing us with this wonderfully plain meal, and begins to eat. "How was your day?" I ask her, not meeting her eyes. She turns to me and throws her fork across the room. "Enough bullshit, Beatrice. Let's get to the point." Point? What point? "You," she pokes me in the chest, hard. "Are Divergent. And that is a problem."
How can she possibly know if I'm Divergent? I didn't even know I was Divergent. I have heard myths and stories about the Divergent. How they have special powers, and how they are murdered when they are found out. I decide to play stupid. "What's Divergent?" I ask with fake curiosity, and she replies with a staggering blow to the side of my face, causing me to topple out of my chair. She lifts me up by the scruff of my shirt and hisses at me.
"Oh, as if you don't know. You are going to be Abnegation; that's all you'll ever be. I'll cure your Divergence." I wake up what must be hours later, and Elizabeth is nowhere to be found. Our plates are left untouched on the table, and I am bruised all over. I groan, and begin to clean up the kitchen.

*End flashback*

And ever since that night, Elizabeth has been "beating the Divergence out of me". According to the aptitude test, it worked. But little does she know she'll never see me again after tomorrow. There's no way I'm staying here, in a faction with her. I have to leave; I need to escape. This is the hard part. Which faction do I choose? In my head, I cross them off one by one. The Erudite are the smart ones. They develop all of the technology our city needs, and are always researching. I find them annoying, acting as if they know everything.
I couldn't be one of them. I despise the Erudite. I cross them off of my checklist.
Amity are the peaceful. They farm and grow all of the food for our city, and are generally uplifting and joyous. Although it'd be nice, I know I could never be kind enough for the Amity.
The Candor are the honest. Our judges, social workers, and juries are made up of the Candor. They stick to the truth, no matter what. And I know I couldn't be a Candor,
for my whole life has been a lie. I have to hide what happens to me at home every day. That leaves the Dauntless. The Dauntless are the brave, the courageous, the daredevils. They are the military, police officers, and fence guards for our city. I've always admired the Dauntless. Every day, I watch them leap off the trains, landing in somersaults or on their feet, and I long to be one of them. After tomorrow, I will. I hear the door open, and curse under my breath. I prepared supper early, because we were allowed to go home after our test. Elizabeth enters the kitchen. Without warning, she grabs my by the shoulders and slams me against a wall.
"Your test results?" she growls, and I have to gasp for breath before replying.
"A-Abnegation" I stutter, and she narrows her eyes at me. "They better be. Now, go upstairs and rest. Tomorrow's an important day."
I nod meekly, and leave her to eat her supper alone. After I hear her bedroom door close, I make my way downstairs and clean the kitchen. I turn off all the lights in our house before getting ready for bed. And when I drift off to sleep, I dream of the freedom tomorrow will bring. I dream of Elizabeth's face when I slit my hand open, and my blood drips on the Dauntless coals. I dream of a new life. A new me.