Tall Creature Document (( Slenderman X Reader ))

"(Y/N), (Y/N) (L/N)." You introduced yourself to your new boss. "All right then, you will be assassinat- I mean.. err... assigned to research this tall, slender, faceless creature that people have been seeing sightings of... especially the little ones... You will need to go into the woods and look for... This." Your boss hands you the document of the creature, and many pictures lay inside.
"I will find this creature, sir..." You trailed off, "Call me Mr. Nightmare Or Mr. Night." Your boss said. You thought it was a strange name but you didn't mind it, so you went to your laboratory and looked up this creature... For now you'll stay human, but for the future you'll see the time change and you change.