Here via gaycrow's rec. What a great story! I had been looking for your stuff to get some sense of what you liked for the Snupin Santa thing, but I think this is the first thing I've seen. (I don't know yet what you wrote for Snupin Santa.) I loved the magic here, it's very clever, and the Snape characterization is a lot of fun. You managed to do an AU Harry who is just as brave and impulsive as canon Harry, only happier, because not raised by the Dursleys--excellent.