My review of the game: So far, Eternum is a perfect game, even without its NSFW components (i.e. if it just faded to black), it would arguably still be a Solid A, with the Ready Player One influences, characterization and the mystery going on.
The NSFW scenes though are what raise the game to an entire other level. It's easy to see how skilled Caribdis is, the first notable scene with Annie has the song "Run Boy Run" play which sensually accompanies the outer teasing. There is also the Nova riding scene where the two can barely contain their desire for each other. But most notably I believe is the Alex first sex scene, with the powerful line "never in a million years" that show she has broken her own principles in order to lust or love our main character. The triple whammy scenes that follow in a roll really seals the deal and makes the scene ground breaking to me, for a free to play game.
Other notable scenes include the Egyptian which adds diversity and exotic feeling, and the Spanish influenced music playing while you are massaging Luna. I look forward to the full game of Eternum...