Request!

2000wires

So, I hope you like it! (Sorry for the background, I suck doing them :/)
Lil backstory. Mabel's brother was sick and she summoned a demon to cure him. The thing was, this demon (Bill) was also a vampire and in exchange of her  brother's life, she had to turn into her apprentice, or in other words, trade her life for his. And being the loving sister she was, she did it...