For The Nights I Can't Remember

"It was within the second year that they all began to accept the fact that they hadn't wanted to for so long. That he hadn't been taken by anyone that wanted information on them. He wasn't on the brink of death. He hadn't just gone missing. Alexander Lightwood had run away. And there was nothing they could do about it." With the aid of a potion and rune Alec erases his memory.