Real talk I prefer calling Andrew/Ashley "coffincest" over "gravescest" bc of the thematic significance of the coffin part and how it relates to their ominous decline into depravity of various kinds. It refers more obviously to the apartment they were rotting in alone together (what comes to mind, especially, is their conversation on the floor—with Andrew waxing poetic abt their shared burials and hopelessly entwined corpses), but also to their codependency/the all-encompassing nature of what they are to each other and who knows what other messed up shenanigans the plot will reveal ♡

AKA it's something uniquely theirs (gravescest could mean any possible combination of that family period) and it refs the title and core of the game ayyy

+ Relevant image lol