There is already a game that is the spiritual successor to SDT. It's called
True Facials. Don't let the name fool you; it's a lot more than that. True Facials has been expanded to full-on sex scenes and even has the begging of a story mode.
Not really, there is very little of SDT in True Facials, great facial physics sure, but game lacks what made SDT fun which is modding, character customization and proper dialogue system with moods/reactions, a much closer match to SDT would be Lust Cupid, although it does suffer from some issues (main one being the artstyle which is just too cartoony, and yes I know SDT was hardly a realisitic game in terms of art style, but it was fairly neutral and LC isn't, but it's not bad, it certainly has all the elements we modded into SDT like custom cocks, larger bulges, x-ray (SDT didn't even natively support anything other than BJ's and had no x-rays, LC has all kinds of positions, x-ray for all holes, inflation, puking/pissing/cumming/swallowing/variable resistance.
Still nothing comes closes to the interactivity of SDT, nothing has the passing out, reactions and all other stuff that still makes SDT fun to play to this day, especially with mods that expand what's in the base game and add new stuff.
Time will tell which game is gonna get closer to SDT, for now Lust Cupid seems to be closer, True Facials seems to be stuck in the "let's add more video game characters" loop now and suffering same issues as Wild Life (why add new game mechanics/story when we can add another animation/character and keep charging people).
There is also Head Game which seems to be somewhere in between Lust Cupid and TrueFacials (3D like True Facials, but not as good with facial sim like it, but has customizaton or at it least it should, haven't played it in a while, doesn't get updates much now and seems to be abandoned, although posts in it thread suggest dev is still working on it and it should have had an update in 1-2 months, but that was in December of last year, still no update).
Best to just start SDT, load up models and enjoy some good ol' deepthroat action, who cares it's old, it's still good, until then, we got those 3 games as alternative, one 2D, two 3D, one in development hell, one with lazy dev
