Red Marker

Red Marker is probably the only scary story I'll ever write, but I like the sound of this one.
It starts when Benson's sister Kiyay gets a marker set in the mail.  She's so excited, until she finds out the red marker doesn't work.  Benson loves his sister, and promises to buy her a new red marker, but before he has a chance, something bad happens.
Benson is getting dressed, when he hears Kiyay screams, he runs downstairs, and finds her, sprawled across the ground, blood coming out of her side, with the red marker without it's cap on the ground beside her.  That night, Benson is going to bed, knowing his sister is in the hospital, when something on the mirror catches his eye.  He goes to get a closer look, and in red marker is the message 'You have been warned!'  And that's when things get REALLY scary.