“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.
I’ll occasionally watch people play something that I deem as “looks interesting, but not enough so that I’ll want to purchase and play this myself”
(Also for watching high-skill players do their thing, but that’s a different dynamic I think)