When Pennrose could no longer ignore the evidence that St. Clauss was not responding to her yearly letters, she took solace in the fact that even if Harry was only playing the part of the saint, he was at least obligated to formally approve or deny her requests.

Part 2: https://www.weasyl.com/submission/1423085/dear-st-clauss-part-2
Part 1: https://www.weasyl.com/submission/1423081/dear-st-clauss-part-1