Demonic Intruder

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Y/N : Your Name
H/C : Hair Colour
E/C : Eye/Colour

You can be any gender in this story (thing) - Male, Female, Non-binary, etc...
You can imagine how your appearance would look like [if you wish

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Y/N, a teenager living their life, any other usual night, they would stay up doing their stuff. Until, a peculiar night, weird things would start to unfold.
Who is that?
/What/ is that?