Even with the title, the main menu screen, everything that gives me hints as to what shall happen in this VN... that first sex scene is still a surprise.
From there, the VN goes pretty full force on the eroticism until the end. I think that the moments where the two royals need to have some decorum provides nice moments to recollect and breathe until the next sex scene. I think that the idea of a kind of social horror in the sense of standard hierarchies of power being utterly waylaid so an empress can go doggy mode and get fucked like a hound in heat is an amusing one. "This visual novel would make the head of a medieval peasant explode" type of energy.
I think that the punk music for the sex scenes (and all the other times it was used, which was most of the vn lol) was an excellent choice. I think it taps into the reality of these royals wanting something much more carnal and animalistic than proper decorum. They want to fuck nasty with it.