CreepyPasta adopted a demon

Hi my name is Midnight Blu but people just call me Blu I got my name because my hair was midnight blue and my eyes were navy blue.
My family is dead because I murdered them and I sucked there blood every little ounce of it.
I did have a little sister she is my twin but her hair is blood red and her eyes crimson her name is Crimson Red but we call her Red.
I am now 13 and I am in a orphanage my sister and I have been getting weird things coming out of our hands but we think it is just a phase we are going through.