Story is about an isekai hero who returns to Earth with his harem, but they are all cursed along the way. He enjoys his girlfriends having sex with other men, and each heroine has her own traits / curse plot lines that are explored.
To be honest, there's a fair amount that I didn't find particularly erotic like some of the heavier content. But, I did find the storytelling interesting enough and it manages to write decent smut while keeping some form of plot cohesion, which most authors struggle with.
The main appeal - which I won't spoil - is learning about the curses, evolution of netorase play, and learning the background in terms of how they met or personality changes (see Delen).
As far as I know that commenter in your spoilers does not know what the hell he is talking about:
Only negative for me is that the series appears to have slow updates or prone to hiatuses. Last chapter was on November 5th, and prior to that, August 28th.