Pre-Hogwarts:
The Age of Discovery (Fic, PG-rated): The main cast discover their magic as children. Ensemble piece.

First Year:
Sorted (Fic, G-rated): Sherlock cuts a swathe of deduction through the Hogwarts Express and sorts everyone into their Houses before they even get there. Ensemble piece.

Running is something that we've always done well (Fic, G-rated): Castiel just made Hufflepuff. It's been a year since Anna last saw him. Castiel+Anna, sibling feelings.

Pinwheeling (Fic, G-rated): Koschei drags Theta over to meet that freak who sorted them on the train. Deductions and silliness ensue. John, Sherlock, Theta, Koschei.