Sorry, I know Bella is a little out of character in the first few chapters- no, no one has told me that- and so I will try to make her more like herself! And I'm going to try a new writing style, that may work better. I would like opinions on the comparison.

Jace didn't like his sister. Anything reminding him that Clary was his sister was evil. "I like her," Clary said with a smile. Jace frowned, "You're kidding, right? She's terrible." Clary scowled at him. Her scowl was something he liked to see. It amused him and made him smile. "Jonathan Christopher Morgenstern-Lightwood! Bella came all the way down here to help our sorry butts. You want to know why? Because she cared! Now, if you keep being such an ass..."
Clary rarely got mad at him, and when she did, she got really mad. Sometimes it was cute. But times like this, when she dared use his name, it infuriated him. There was a crack of thunder. Oh, great, it's storming! Jace thought. Clary took one more glare at him and stormed off to find her sister. Because she was not his own sister. Like Jocelyn was not his own mother.
But Clary was right, in a way. Bella had come all the way across the country to help the siblings she thought she loved. But no matter how many times Jace told himself this, he couldn't bring himself to like her or even feel grateful. But he wanted to so badly. And after a few minutes, something did pop up inside him, that made him come to like Bella a little bit; the way she looked at Alec. It was similar to the way that Clary had once looked at him. And earlier when Alec grabbed her hand, they both blushed... They liked each other!
Alec and Jace were parabatai. The normal meaning is a chariot driver paired with a warrior, but with the Nephilim, it mean two men who fight along side each other and swear to protect each other. Jace had known that Alec was gay, however it seemed now that Alec was crushing on his sister. Wait, what? His brother was crushing on his sister? Hmmmm.

Alec led Bella to the library where his parents sat waiting. When Bella walked in, they smiled at her. It was a familiar smile, a smile his parents often gave to him after they came back from a long trip. His mother ran up to Bella and hugged her, "Oh, Bella! I haven't seen you since you were a baby! Look at you, so beautiful and grown up! I remember when Valentine showed up on our doorstep with you, only a few months after Alec was born..."
His father beamed at her, "Oh yes, I remember it well. You can call me Robert, and I assume you can call my wife Maryse?" Maryse nodded in agreement. "Alec, darling?" his mother asked him. He looked up at her and there was a look on her face asking if he liked this girl. "Yes, mother?" Alec asked in a form of a question, but Maryse was no fool and she knew this was his answer. "Oh, um, never mind," she muttered happily.
"Alec, why don't you show Bella around the Institute? Of course, she's not going to learn her way around right away..."
Alec was more than glad to have some alone time with Bella.
He led her out of the library. Not far away was the Garden, and that's where he was taking her. On the way there, she tripped on Church. "Oh my gosh! I am so sorry! I'm such a clutz!" she apologized. Alec laughed and her, and helped her up. She looked up at him with a warm smile, and it almost melted him. "It's fine, really. That's Church. He's older than us, much older. He is even older than my parents. We think he's special, magical," Alec informed her.
"What about Jace? He doesn't seem... nice," Bella retorted. "Who doesn't seem nice?" asked Jace. This, of course, scared the living daylights out of both of them. Bella turned and cowered into Alec, where Alec had turned to protect her and gave a deadly look at Jace. Did he always have to ruin things? "For you information, Bella, I've decided to overlook the fact that you're my sister, and be nice. I'm nice to Clary, because I've had time to get used to it," Jace said with a smile. Alec rolled his eyes, "Oh, yeah! You're really nice to Clary. Really, really nice!"
Jace glared at him and stalked off. It was not like Alec to tease Jace about his problem. Really, he was the only one who didn't. But with Bella still curled up into him, he felt the need to. This is a nice moment, Alec thought to himself. Bella looked up at him and her cheeks were bright red. She stepped away nervously and muttered an apology. "Um, this way," Alec said.
They walked into the Garden. Bella gasped in delight. It was truly beautiful. "It's even prettier in the moonlight," Alec hinted. Bella looked at him with an awkward smile. "Really? Promise you'll take me up here sometime soon?" Bella asked. Alec agreed.
Then, of course, Clary came flaunting into the room. Bella stood up as she came near. Clary hugged her older sister. "Wait, you two, stand next to each other," Alec demanded lightly. Bella and Clary stood next to each other obediently. "Hm, you two look like sisters. I think you have the same hair, really. Most would say it's different shades, but I think slowly Clary's hair is becoming the same as Bella's. You both are bellow average height, same skin tone..." Alec speculated.
Clary and Bella smiled at each other happily. "Have you shown Bella to her room yet? I want her to have the one just across the hall from mine, if that's okay. In fact Maryse sent me up here to give you her bags. Would you like me to show her the way there?" Clary told Alec, not even bothering to look at Bella. Alec tried to keep his voice calm, "Naw, that's okay, Clary. I think I can do it. It'd probably be best if you helped her unpack and get settled in though." Clary looked at Bella with her eyebrows raised, and Bella replied with a reassuring smile.
"Well okay then. I'll go help Isabelle. I'm sure she needs me to pick out an outfit for Magnus's party this weekend!" Clary said. And with that she skipped away.
"To your new room," Alec declared and they marched off. Though that didn't last for long, as soon they stopped and were giggling. "This is ridiculous," Alec said laughing. Bella agreed with a smile. Alec did not laugh much. He was always more serious, and responsible. So was Bella. But at this moment they each dropped that unfortunate characteristic and laughed.
Alec walked her to her room. "Tonight?" Bella reminded him. Alec nodded, "I'll be here at 11."

Bella almost forgot about Edward when she was with Alec. Almost. A little voice in the back of her mind repeated "you will be safe there". There was a knock on her door. "Come in!" Bella called out. Clary walked in with a grin that went from ear to ear. "So you an Alec, huh?" Clary asked. Bella laughed at her little sister. "I don't know," Bella said. But she couldn't keep the amusement out of her voice. "I'm sorry! It's just that... well... you gotta promise you won't say anything. But we all kinda thought Alec was gay," Clary explained.
Bella laughed nervously. Was it possible? No! "Anyway, I'll help you unpack," Clary continued.
"Is this really all you brought?" Clary questioned. Bella shrugged. "Well, we'll have to do something about that! We can go shopping tomorrow afternoon. You, me, probably Isabelle..." Bella shrugged once more, "What all do I seriously need?" Clary thought for a minute. Maybe she was thinking about how much fun it would be?
"Well you obviously need a bedspread, you can paint the walls... You will probably fit into Isabelle's party clothes, and you need some for this weekend. But I think it'll be nice to have your own. And room decorating is essential! We can get you books, if you like books as much as I do... And anything else you see that you want. The Lightwoods have a lot of money and aren't afraid to use it..."
"But I feel bad about just taking the money from these people I just met! And I love books!" Bella complained- well, you know, except for that last part. "You didn't just meet them," Clary reminded her smugly. "You've known the Lightwoods since you were born. And you know that goes for Alec, as well." Bella sighed. It still felt wrong taking their money.
"God, he's gorgeous," Bella muttered. Clary smiled at her, "Well, tell me a little about yourself. What's your life like?" This instantly reminded her of Edward. But she didn't hold back while telling Clary her story.
"Well, I kinda fell in love with this guy that was a vampire. He was amazing, gorgeous- as all vampires are- talented, smart. And he loved me dearly. His family- I guess you guys don't call it family, you call it coven- were like siblings to me. I even had the desire to become one of them, so that I could be with him forever. Well one day he led me into the woods, and told me he was leaving. Edward said that without himself in my life, I would be safe. He left."
"And now you're here?" Clary finished. Bella nodded, tears in her eyes.

FYI, I really love reviews- good and bad! And comments about the writing style, how it compares. If you find any spelling or grammar mistakes, please inform me!