If it isn't painfully obvious from my pfp...
I know
Sailor Moon is a product of the 90's, but still, just stop and think about it for a sec. It's an anime/manga about a group of 10 magical girls fighting against all sorts of monsters. The hentai basically writes itself at that point.
Although not really an anime, i'd also like to see more games based on
Totally Spies! I know there are a few already here on F95, but they're all visual novels, and pretty short ones too. I'd actually like to see someone tackle an action hentai game based on that IP, preferably a brawler-esque H-game a lá
Pure Onyx
Fullmetal Alchemist... I don't believe i've ever seen a single H-game about it. It'd be fun to see a game tackling Winry's adventures while the brothers are away doing their thing... If you know what i mean...
Ghost Sweeper Mikami... I don't ever hope seeing a H-game of a super obscure anime from the 90's, but hey, i also didn't expect one based on
Magic Knight Rayearth out of all things, so, one can dream, right? Especially because, just like Sailor Moon, the hentai for Ghost Sweeper Mikami basically writes itself, since the MC is a hot bitch who is obssessed with money. A gold digger who just happens to also be good at exorcising ghosts... Did that got you excited already?
Inuyasha... Young highschool girl going around feudal japan battling Youkai? Again, the hentai writes itself, basically. Though i'd personally prefer the boomerang girl be the MC instead, as she's the prettiest girl in the series IMO.
Saint Seiya... This one would most likely be a full gay parody, but i wouldn't mind it much because hot damn, Saint Seiya has some of the hottest androgynous men in anime history lmao. Though a game about Saori would've been hella fine too, since Saori is really beautiful.
There's probably more, but i think these ones would be my most anticipated ones.