That would be sweet BCG
A gallery would be great to see all the scenes in one location, like a scrapbook of sorts ;D
It would also be cool to have an "exclusive CG" section in the gallery. As in, players are incentivized to find
hidden collectible CG images scattered throughout the overworld in the game, and then those hidden CG images can be viewed in the gallery, separate from the actual sex scenes in the gallery.
So, these hidden CG images could be various female characters like Sophie/Suzy wearing different types of exclusive outfits or these hidden CGs could be various girls in compromising poses or performing sex acts on anon that are not tied to an official scene in the gallery. That would be pretty cool to see implemented, just my $0.02.