I just wanted to let you know that my working on the missing Christmas chapter has already yielded results...
While in Grimmauld Place, Harry get's a chance to talk to Severus and, as a result of that, asks him if he wants to go to Godric's Hollow with him. Harry wants to visit his parents' grave, like he did last Christmas with Hermione. To his surprise, Severus agrees, and they finally have a chance to talk about all the things that happened in the past.
For me, it was a chance to look more deeply into some of the unanswered questions that remain about the night Lily and James died, the events that led to it and a number of other issues I personally considered plot holes. (Full list of the adressed topics at the beginning of the first chapter).
The discussion was meant to be just a chapter, but as always, it has turned into a multi-chaptered piece again. I've started publishing it under the title 'The Truth Behind it All'. Please be warned that it's not a fluffy piece full of romance and action (well, romance would have been weird with Harry and Severus anyway), but again a story consisting mainly of dialogue with A LOT of background information.
Once it's finished, I'll go back to the rest of the Christmas Chapters, which are also coming along nicely. :)
Hope you'll enjoy reading!