Oh, the aching beauty of the beginning! It really underscores what the war and suspicion took from him. And even the middle while heart wrenching is mitigated slightly knowing that Sirius tried to fight for them.
An you left them with Christmas, at least. Sob!

I take the hand he offers and we Apparate to my flat. A silent thrill runs through me at the thought of us being together on Christmas. For one day we will be free to be ourselves and to forget about the war.