Ah, it's good that you revived a thread like this. I may be able to offer something constructive to this kind of topic.
It started as a normal school trip. Ten students and four chaperone teachers were looking forward to spending their time at a private hot springs inn. But little did they know that one small mistake would lead them down a rabbit hole of violence, insanity, depravity, and absolute terror.
www.scribblehub.com
My fiction, Terror in Ryokan, contains a scene depicting a teenage girl (It's obvious she's in her late teens, but her age isn't explicitly mentioned, so there's no way to know for sure whether or not she's a minor) engaging in necrophilia with the dead body of another character. The scene isn't described in detail - mostly because I'm completely unused to writing sexual stuff and the scene is more for shock factor as the sort-of climax of the story - and is mostly conveyed through the character's dialogue, moaning, etc.
Before uploading the particular chapter the scene in question takes place in, I was concerned about whether or not it violated the content guidelines. But in the end I received permission to upload it from Tony personally after messaging him about it. If it helps, feel free to use the scene as a reference for what could be considered "light enough to pass" or as a guideline for how far you're allowed to go with these sorts of things.
Personally, I feel the scene rather pushes the boundaries a bit, so I'm grateful for Tony's generosity.