I'm going to get real basic here. It's gonna be vague. I want developers to really think about this, to help start a dialouge between fans and devs on what makes a hentai game a hentai game. So here's my ideal game: a game where hentai is part of (or is) the core game mechanic. Do whatever you want, but make sure hentai takes center stage. It has to be such a fundamental mechanice that the game stops making sense without it.
If it makes sense without the hentai, then the game never really needed it. Which is why I'm not really all for the Skyrim with boobs thing. If you take away the boobs, you've still got skyrim, which works well enough without the boobs. So I'm gonna give an example of a game with EXCESSIVE VIOLENCE and how that EXCESSIVE VIOLENCE is an itegral part of making the game what it is. Why? Because it's seems it's all the industry seems to know how to do right now, but I'm gonna talk about a game that did it right.
In Dead Space fight crazy space-monster zombie-alien-mutant-things. They can't die like normal things, canonically they don't die, period. But fret not there is hope. They are not invunerable. With some heavy industrial tools and the saavy to remove their safeties, You can cut off the creepy space zombie limbs and stop them from moving.
The cool thing about this is that the game is built around being a psychotic butcher. All the enemies have their own reactions to how you cut them up and how you cut them up changes how you will proceed. Shoot off some dudes legs, he crawls at ya. Cut off a claw, then congrats! Now you have a new weapon you can chuck at his buds! The game is so built around the fact that these guys get cut up that if, say... You tried to remove the gore, the game wouldn't function properly. These things need to get cut up. The game's mechanics are built around this concept. Which is why it's so damn violent. It's not just because visceral studios is weird and probably needs therapy, it's because the game is built around violence, and it wouldn't make sense narative or gameplay-wise to remove or even tone it down.
In a nutshell. If it's a hentai game, the hentai parts of it shouldn't be trivial. There has got to be a purpose for it and a depth to it. It should be one of (if not THE) core aspect/mechanic/whatever. Metroidvania with some sexy rape anims and game over CGs is fine, but if those are removed, then you still have a metrovania. If that's the case, then was the hentai really necessary to beging with? I want an h-game that has good reason for being an H-game.
That was long fucking winded.