KrampusKlaus

When Gina and Bobby wake up at midnight on Christmas Eve, they catch Santa in the middle of his present deliveries—but he's unlike any Santa they've ever imagined. He's short-tempered, rude and wouldn't know jolly if it ran him over with a sleigh. It turns out that Santa has been cursed. Gina and Bobby don't figure out a way to save Santa, he'll turn into the demonic Krampus, (Hell's official Punisher and Tormentor of Naughty Children), forever.
This short story was originally published in the holiday anthology Naughty or Nice.