This story has potential, but rationalists and their aversion to humour ruins it. The Last Christmas is a fun premise, but way too short to build it up properly, and so it ends up all over the place. Still: It’s short, and a nice read, so if you want to see how an engineer deals with suddenly being Santa, go check it out.
I'm currently behind on reviews, so don't be surprised if the recent reviews are a bit sparse.