Lockdown (A Creepypasta Fanfiction)

What happens when a few clicks of some locks in a school, two girls, maniacal laughter, and a bunch of pentagrams are combined? (And a bunch of random shit :3 -Mia) ... This story. (DISCLAIMER: We all know about the girls who tried to murder their best friend to show dedication to Slender, but we want to inform you th...