Fulfilling a Promise ([Ib] Garry x Reader)

Curiosity Kills

J-Just a brief power outage, I'm sure...
(Y/N) anxiously looks around the gallery, not seeing a soul. After wandering around the exhibit numerous times and saying "Hello, is anybody here?" more times than they can count, they find themselves back at the mural; only to be greeted by a blue substance leaking underneath it's frame. A blue substance inscribed into a message, practically begging to be read.
come down below (y/n) i'll show you someplace secret
(Y/N) feels a rush of panic course through them as their mind was bombarded with panic driven questions.
Who-rather, what left this message?
How do they know who I am?
Where is "down below"?
What's their objective here?
What's going to happen to me?
Are they trying to lure me to someplace?
Oh god, are they going to kill me?!
Although still a bit nervous, (Y/N) takes a deep breath, and tries to regain the little composure they had. They decide to walk around the gallery a bit more to see if anything has changed, and much to their surprise, something did change. A mysterious door where there had been a wall. It wasn't locked, and there's nowhere else to go, so why not?
They put their trembling hand on the doorknob, and froze.
...but should I really?
Who knows what's in there? It could be anything. Anything dangerous.
But god damn were they curious. It got to the point where they couldn't take the pondering curse of curiosity. As they opened the door, they realize the major mistake they just made.

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