Hi bloodlust
How about the following idea: Julie goes with some of her friends in the urban sewer, because one of the girls has heard that tonight apparently a gothic scene should take place there. Julie does not like it at all because she's so scared of rats.
In the end, she lets herself be persuaded and goes with them into the stinking tubes, which means death for her and her friends. Because it actually turns out that deep down in the sewers not only rats live, but also creatures that feed exclusively on intestines. But since Julie is so afraid of rats, her belly should be eaten by them.

I have already written a similar story, but in German. My English is a disaster, so it's out of place in this forum. I use a translation program.