“glowfic” apparently. written in a roleplay forum format.
This is not a story for kids, even less so than HPMOR. There is romance, there is sex, there are deliberately bad kink practices whose explicit purpose is to get people to actually hurt somebody else so that they’ll end up damned to Hell, and also there’s math.
start here. or don’t, of course.
Yeah, it’s both impenetrable and punishing, which I think is in part due to the glowfic format (which I am new to). There’s even a glowfic primer from LW!.
One advantage of the format is I did like the bits where Yud’s writing partner seemed to be trying to rein in his nonsense spewing a bit.