I personally like to read seriously written but also really fucked fanfictions because I want to see either how serious this person is about this weird thing, or if it's something really REALLY weird, how well they can write it.

It usually ends with me having to stop reading halfway through and I just put my head in my hands and sigh.

I liked this one
https://archiveofourown.org/works/10743234?view_adult=true

Lol, the end of that link says "adult=true". This should be good.

If you want terrible fanfiction go to crossovers. You can find some really stupid ones there.

@Sae Niijima Those are the ones I main.
Seriously though there are some awful ones.