Author note: this is my first fanfic so it might not be very good, but I had fun writing it and I absolutely love Kaie. Disclaimer: I do not own Mortal Instruments

Chapter 1: Kaie Hayes

Jace was tired of being locked up in the Institute. Alec was arguing with Isabelle and Clary was out with the bloodsucker. He was watching the siblings fight when the bell rang; telling them someone was at the door.

"I'll get it." He jumped to his feet and went to the large door. Opening it, he found a little girl holding a green stuffed dragon. She looked to be about seven. Her hair was white as snow but the last three or four inches were bright blue, though it looked natural.

"You're a Shadowhunter, right?" she asked, looking up at him with big eyes, the left one an emerald green and the right an exotic orange. He nodded.

"I'd like to join you. I want to fight monsters." She declared. He studied her for a moment, then turned and left, leaving the door open so she could follow. She did, reaching up and grabbing his hand. Glancing at her out of the corner of his eye, he led her to Isabelle. Isabelle instantly stopped arguing with her brother to look at the little girl holding Jace's hand.

"Who's that?" Alec asked. Jace shrugged.

"She said she wants to be a Shadowhunter." Isabelle bent down in front of the girl and smiled.

"What's your name?" she asked.

"Kaie. Kaie Hayes."

"And you want to be a Shadowhunter?" Kaie nodded.

"Why?" Alec asked. Kaie smiled.

"Mommy says I'm a demon. So maybe if I kill demons, she'll see that I'm a good girl." All three teenagers stared at her in shock, though Jace kept his face completely emotionless.

"Why would she say that?"

"She doesn't like my eyes." Alec thought for a moment, and then tapped his sister on the shoulder.

"Maybe we could let her join us. We could help her." He said quietly. Isabelle nodded.

"I was thinking the same thing." she said in the same volume. Jace was watching the people he considered his own siblings with little interest.

"Alright, Kaie, we'll let you stay. But you'll train like us, fight like us, kill like us. Got it?" he said. Kaie nodded happily.

"Would you care to show her around, Jace?" Alec asked. Jace shrugged and Kaie grabbed his hand again. He showed her around the Institute, giving her a room across from his own. After her tour, he told her to go to Alec, who would get her some food. She immediately obeyed, finding the dark haired boy in the kitchen, drinking a glass of water. He looked down at her. She was still carrying that dragon of hers, holding it in her hands.

"He's pretty cute." He smiled and nodded towards the toy. "What's his name?"

"His name's Mochi. My big sister gave him to me for my birthday." She said, hugging it. Alec nodded.

"I bet you're hungry, huh?" he said. She nodded.

"Well there's a really good burger place close by; we can go there if you want." Kaie nodded and they walked to the restaurant, Kaie clutching Mochi in one hand and Alec's hand in the other.