I don't give a fuck about Fate Gay Order so it's pretty hot to see Gilgamesh shit on that entire game including his own personification in it. Anyone who self inserts in a gacha game that ruined the series deserves to be NTR'd
They managed to NTR the entire Fate fanbase. How could they not go for that?
Usually there is a reversal/happy end in part 2 of such stories, I would like to see Fujimaru turn the thing around on Gilgamesh and get Mash back by his own abilities.