Revelations (слэш)

Set the evening after Alec looks through Magnus's box of memories in season three. I felt like, in reality, that would have cut a lot deeper than the show let on and I needed a better resolution. There's a tiny plot about a Warlock child too, but it's not the main point of the story.
“'Someday… someday I’m gonna be one of those things in your box and you… Magnus you’re, like, my whole box.' He swallowed thickly and blinked away a few tears. 'You’re my whole life.'”