This game is still one of my all time favorites
I can only agree. I still wonder whether it is nostalgia (it was my first sandbox of this style back when I was still hunting for lewder games in other places and didn't know about the cornucopia I can get here) but there are some factors which still click for me:
I do consider the pacing both storywise as well as gameplay wise (amount of "grind" per reward) to be almost perfectly suited for my needs, only the "endgame" may get a bit boring when you only have one path to complete left.
I still think the "dream about your future" idea is a great way of how to handle individual endings without the need for replay.
Veronica's path still features one of the - for me - best dom/sub relationships in any game in that it both evolves nicely (see pacing again) and is not completely over the top (parading naked in the bus).
Also, while "one big mean sister, one cute small sister" of course is a cliché on its own, similarily I think Ashley's crush develops better and more realistically (okay, only slightly more, but more nonetheless) than most others.
Sophia is - again to me - one of the nicest "naughty little minx virgins" around here.
Pam also is a lot of fun with her somewhat unexpected storyline.
Add to that a lot of QoL in the UI, a well made gallery with also the dialogue not just the images, and yeah, the package is good indeed.