1998 & 2002

Alec first met Agatha when they were children, playing in Alicante, Idris waiting for their parents to finish doing whatever it was that adult shadowhunters did whilst in council. Agatha was three and Alec was two years old they were being watched by Tessa Gray, it was the first time that the two had met. Agatha immediately taking to the younger and smaller boy.

"Agatha, Alexander please don't go that way," Tessa chased after the two nephilim children as they ran around. Agatha and Alec giggled as they continued to run only stopping once Tessa caught hold of them.

"Tessa, I want a big brother,"Agatha giggled before she seemingly disappeared from Tessa's arms for a split second before reappearing again. Agatha's magic wasn't strong enough to set of the wards and technically she hadn't created any portal's.

"Agatha, you have to be careful when you visit Magnus," Tessa whispered to the small girl before Agatha grabbed Alec's hand and they proceeded to run around again.

"Alec we'll be friends forever," Agatha grinned looking at him as she spoke.

"Promise?" Alec asked as his parents started to head towards them.

"Yep, I do," neither of them understood what the word 'promise' meant – to them it was just a word that they had heard their parents use.

"Alexander, it's time to go now. You can play with her again another day," Maryse Lightwood called out to her young son as they walked from the gathering of members of the Clave.

"Bye, bye Aggie," Alec waved as he walked over to his parents and was taken by the hand. Agatha ran over to Alec and hugged him before she ran back over to Tessa.

"Bye, bye!" she waved as Tessa took her to meet with her mother.

Alec and his parents used a portal and headed back to the New York Institute with the two year old continuously babbling about the pretty big girl that he had met and decided that she was his friend.

Four years years later and Agatha was no longer living with her mother, but rather with a man claiming to be her father. The only way that she could see Alec was when her father and baby brother were fast asleep. Agatha closed her eyes and thought of where she wanted to be, at seven years old being unseen was one of things that she had mastered.

"Jace, I'll be back soon I promise," Agatha whispered to her four year old year old baby brother and hugged him tightly.

"Aggie don't go!" Jace cried into her shoulder, they may have only been small children but they knew family.

"But I'll be home soon," Agatha told him quietly before doing what she had done the first time that she had visited Magnus.

Six year old Alec sat playing on the floor of his sisters bedroom in the New York Institute, he'd been telling her stories of Agatha from the day that they had met and played for hours. Isabelle stared at her big brother in awe, as a four year old does when their older sibling is talking to them.

"Alec," Agatha grinned as she appeared in his sister bedroom.

"Aggie," Alec returned the grin of the older girl and then pulled his baby sister up and pushed her in front of him. "Izzy this is Aggie,"

"Hi Izzy," Agatha smiled, looking at the little girl whose eyes brightened as she heard her name.

"Hi," Isabelle smiled at her watching as Agatha and Alec hugged.

"My dad's teaching me to use a bow and arrow," Agatha told him proudly, it was one of her favourite weapons.

"Help me when we're older?" Alec questioned, it wasn't unusual for some of the nephilim children to enjoy using weapons from a young age.

"I will, when we see each other again, I have to go home. Jace is waiting for me," Agatha replied, she hadn't mentioned her little brother until now.

"You have a brother?" Alec was confused by her answer, it had after all been a couple of years since they had seen each other.

"Yeah, Jace. He's four. You have Izzy," Agatha told him, Agatha hugged Alec tightly before she told him again that she had to go. "Alec, I'll come back soon promise,"

Agatha kept her promise and was back a month later for Alec's sixth birthday and to give him what would be the first of many presents that she would make for him with enchantments. Magnus had helped her make this one telling her to only give it to someone that she would trust to keep her secret.

"Mom, can Agatha come?" Alec questioned, he hadn't mentioned Agatha's name in fear that his parents would disapprove.

"Agatha?" Maryse questioned, looking down at her son as she spoke. Alec nodded grinning at her. "Is she the girl you played with in Idris?"

"Yes, can she?" Alec was insisting that she came, his mother agreed to allow the young girl to attend. "I'll ask Hodge to send her a fire message," Alec grinned and ran of to find Hodge Starkweather to ask him.

The fire message appeared in Agatha's mother's hands asking permission for her daughter to go to the New York Institute for Alec's birthday. Agatha's mother contacted Tessa asking her to somehow get the message to her daughter and to take her to the Institute she believed that her daughter shouldn't have to miss out on small things. Tessa quietly took Agatha to the New York Institute for Alec's birthday long enough for her to give him a small teddy bear with an enchanted witchlight that would light up whenever he was frightened.