Decided that this would work since Haji being a great cello player and sebastian being a great violinist ...
Got the background from here X
A Chiropteran (Chevalier) vampire

And then a Demon....
both have a master to protect... but play great music.

Make a great team don't you think? But here's my entry hope you like it ... enjoy. though it took me a week to do this but its done at least.