Your a shifter.

Your in the slytherin common room late at night talking to Pansy and Astoria. Until Mattheo walks in, "Hey y/n...can I talk to you, alone?"

You get up and go to his dorm where he shuts the door behind you both. You then notice your diary on his table...the diary that has your scripts and where you write about what happened in each shift.

"I know your secret..."