Well, this is a two-fold piece, maybe three.

1) it's for the 100 manga theme challenge #57---sacrifice
2) A fanfiction I am currently writing deals with Sakuya singing a duet with the girl in the middle (no, there is no 'love' between them).
3) I got to draw Santa-san again, duh

The reason this is 'sacrifice' is because of the duet's name in the fanfiction. ^.^;; It's a verbally painted picture of a girl 'sacrificing' herself to a one night lover... >.