Christmas with the Black Knights
Kallen sighed. It was already nearing Christmas and this year she had to spend it with the Black Knights. Just as she was wallowing in her sadness, she heard Lelouch, AKA Zero, outside her door with one Tamaki asking his "buddy" Zero if they could throw a Christmas party. The man in the mask agreed defiantly. Kallen grinned at the overheard news, when she heard Deitard interrupt. To her it sounded as if he was trying to black-mail the poor man in the mask as he took the guy around his arm and whisked him away asking for a favor.
A couple days later, on the day of the party, kids (and those who were VERY gullible) screamed in joy as Deitard announced the arrival of everyone's beloved figure, "Santa Claus". It had to have been black-mail because what Kallen saw appear wanted to make her explode in laughter, but the shock kept her silent. Out on the stage appeared Zero… in a Santa suit, beard, mask and all. Yes, Christmas with the Black Knights turned out to be the best of them all.