Well if your talking about what a person would want...
I would like a combination of Tifatanx2, all of toonpimps RoR games, the caprice doll RoR game, nightmare sphere, and erotical night...
It would have the adventure-genre elements of caprice doll with the selectable missions/levels, and the GO CGs..
The multi-rape goodness of toonpimp's game but improved so EVERY monster can rape you with any other AND have more than 2 of them on you at one time...
The awesome fighting goodness of the tifa fighting game so you can choose to bash the living crap out of your enemies with epic combos as opposed to just getting raped..
And the mechanics of nightmare sphere that let you level your character up and learn new moves, along with the after-defeat raping goodness so the fun doesn't stop when you lose.. :3
Mash that all together and add in 50 or more different monsters and 25 levels with a boss on every 5th level and an entire division of the game set to the exact same thing but with a MALE protagonist fighting FEMALE-type succubus monsters...
And you have the golden mother load of all RoR games, a true shining relic amongst hentai games that would never be forgotten for generations to cum...
That's what I wanna see.. But I don't think even the most skilled god-of-a-hentai game-developer could even make such a game.. It will remain a mythical fantasy..
..... But a guy can dream..