The Erynn finally gets it, or Erynn NTR spoiler posts like an hour or so after the update dropped?...yeah thanks for that!

I think you even brought a few NTR enjoyers here thinking it was real.
Between those taking the piss saying "i knew she was a slut", those deeply offended seeing a LI with someone else and those extremely aroused by it... This place would absolutely be in flames.
did nyx plan to hook up john and emily on day 1 or is it more recent thing?
It may have been the plan for a while, Erynn looking for her father was established quite early... and Emily was available from day 1.
Even in the flashback with Melissa, Emily says something like "he sounds hot, i think i would fuck him".
And in their very first interaction they flirted.
Much is made of the MC being like Santiago in various aspects, including manwhoring...
But Emily has quite a track record herself.