They live in the dark

In an attempt to return home for some simple rest and relaxation, a science teacher inadvertently walks through a portal of darkness into a realm of an obscure world filled with demonic creatures.
Written by LeRieur
A link to this story
https://www.reddit.com/r/nosleep/s/iVp1ePXveq
Music by Myuu
https://soundcloud.com/myuu
Sound effects
https://freesound.org/