I do understand that he's likely working a day job and doing this on the side. Probably why it's taking so long.
However if the game is a glorified scene viewer, might as well open up r34 and watch some warcraft porn. Alternatively just boot up ultra modded Skyrim and get somewhat similar visuals. Except you get to actually play.
No story - no game. Simple as that for me. This as concept for potential future systems works. Scenes are nice.
Now it's time to scrap it and start from the very beginning of the story.
Alternatively, just switch to Ren'py or unity. Tell instead an interactive story. Rexx can already pose, edit models and animate.
Unreal Engine games are widely known to be always unfinished messes. Might as well start over with actual storytelling.
Nobody wants to boot up the game and start in the endgame where heroines are already broken/trained.