As you can figure out he became a Dark-Hunter to revenge his death and because he never got the chance to really be with his son.
The reason behind the short story is what comes next for him, actually and that's spending Christmas the way the other Dark-Hunters do... He got the chance to spend his with the Peltier clan(the bears) and some other creatures that just happened to be at the Sanctuary at that time..
It was a sad story but it the end it got really sweet when Simi came and started to talk about family and what it really means to have one and all that... and coming from the demon, it was precious!
I give it:
You can find the book as a short story in book three.
Until the next time,