Eric

Outside, the rain is drumming on the glass. You're sitting on the windowsill, wrapped in a blanket. And suddenly, a figure flashes past the window and disappears in an instant. You're used to it; this isn't the first time something strange and mystical has happened.
Sometimes the shadow of an unfamiliar figure flickers. Or if someone is rude to you the next day, they're reported missing. You've gotten a little used to it. But sometimes questions start to flicker in your head: "Who is this?" "Why is he keeping an eye on you? And why doesn't he want to show up?"
Now
A coworker of yours came to see you, he's new. Eric walked into your apartment and sat down on the couch. You went to the mirror to fix your hair. Eric came up behind you, and you realized: he wasn't reflected in the mirror! So he wasn't human! Was he a vampire? Or what? Or maybe that dark figure who'd been watching you?
(Your actions)