Thanks for the reviews. :) I'm aiming to do approximately two chapters per episode, hopefully it will all work together.
A/N: This chapter is likely to change slightly with the outcome of episode 5. (Please note that this chapter has changed slightly).

Chapter 2

"Be careful my dear Agatha," Magnus said as Agatha disappeared through the portal.

Isabelle, Clary, Jace and Alec stood waiting hidden in the shadows for Agatha to arrive at the institute. The four of them walked towards the front of the abandoned church and up the steps stopping short of the front door.

"Are you coming Aggie?" Isabelle turned around to face her older counter-part.

"Yeah, I'm coming. Just give me a second," Agatha replied, pulling her hair back from her face before she walked quickly up to join the others. "And Alec, the Clave know that I'm here so don't bother going to try and send them word," Agatha told him resting a hand on his shoulder as they walked through the doors.

"I'll take Jace to the infirmary, go speak with mother," Alec told her pausing before he spoke again. "And then come and find me," with that Alec took Jace straight to the infirmary Agatha nodded and took both Isabelle and Clary with her to find Maryse.

"Alec, your mother isn't home," Aggie had searched the institute and found no sign of Maryse being there.

"Oh, well go do something with them and then come and find in me in a half hour," Alec told her, helping Jace off to the infirmary.

Half an hour later and Isabelle and Clary found Jace exactly where Alec had left him being stubborn in the infirmary. Isabelle laughed a little, it wasn't unlike him to be stubborn, in fact both Alec and Jace were stubborn to the point where they argued upon who was right. Clary looked to Isabelle and then at Jace before she spoke.

"What's so funny?" she questioned, raising an eyebrow at the brown haired girl beside her.

"Jace sees himself as our protector and doesn't particularly like to be looked after," Isabelle explained watching as the Jace was looked over and looking at Clary. "You'll get used to it,"

"I don't know if I want to get used to this, I'm still trying to wrap my head around the whole thing," Clary paused briefly before she continued to speak. "How come you didn't know the girl, what was her name Agatha? And then you did?"

"Aggie is Jace's older sister, Alec's best-friend before Jace even came along. She's also my best-friend and parabatai...the reason that I didn't recognise her, now that's where it gets a little complicated," Isabelle told her, as they heard Hodge walking up behind them.

"Young Agatha is back then?" Hodge questioned, Isabelle nodded before the older man walked away again.

"What was that about? And what do you mean complicated?" Clary asked, as Jace pushed the shadowhunters that were attending to him away.

"Agatha is complicated, no one quite knows how she survived being born. She's also my sister which is why I both hate her and love her," Jace said standing before them and resting his hand on the wall behind the two girls.

"I still don't understand," Clary tilted her head looking at Jace as she tried to figure out just what they were all hiding from her.

Meanwhile Agatha had found Alec laying on the floor of his room staring up at the ceiling tossing his witch-light up in the air. Agatha stood in the door way and looked around the floor to see what she could kick at the boy, her eyes settling on his discarded boots. She took a step towards the boot and kicked it softly allowing it to hit Alec startling him causing him to sit up.

"Alec," Agatha walked further into his room and sat down on the floor beside him. "The memory you gave up of Jace, it's still inside you – it's just hidden away,"

"Aggie, you don't know that," Alec sighed, as Agatha wrapped an around him, almost forcing him to rest his head on her shoulder.

"When you kill a greater demon, it's not completely gone...it takes a few hundred years for them to come back but guaranteed they do come back," Agatha explained, not knowing whether he would believe her.

"You know, you didn't have to do the memory spell on me...I would have remembered you no matter what," Alec told her, moving slightly so that he could see her.

"You're stubborn you know that. Grab your bow and arrows we're going to go shooting," Agatha told him standing up and pulling him up with her. "Here, this memory of Jace is just what you need," she told him sharing a memory of a time when Alec and Jace first learned to fight one another.

"I hate you sometimes," Alec said as the memory flooded into his mind causing him to smile at the thought. "You've always known haven't you?"

"How can I not?" Agatha laughed, hugging the taller boy as they stood in his room. "Now come one grab your bow and arrows and we're going to the park it's vacant this time of night," Agatha dragged Alec towards the weapons room where they bumped into Hodge who stared at her and then looked to Alec with a raised eyebrow.

"You're back then Agatha?" Hodge said looking back at her as the two grabbed a bow and arrow each.

"I'm standing in front of you Hodge, so I would say that the answer is yes. Now Alec and I are going out into the park we need to let off steam and don't worry the mundane's won't see us," Agatha told the older man as Alec grabbed her arrows from her and started to rune them. Within minutes Alec and Agatha had made their way to the park and where they fired at the same tree over and over again. "Alec, you know you can always talk to me whenever you need,"

"I know, and I love you for that. But there's nothing to say," Alec told her firing just above where her last arrow had hit. "I remember doing this years ago, and you taught me...not Hodge you,"

"I love you too, and hey I helped Hodge teach you. I told you to focus on the smallest of things to hit that one spot and you did just that and you still do," Agatha laughed, firing her next arrow above his. "Trust your instinct's, just not about Clary – she's different you'll see,"