If I depart from purely or mostly oral series, again, my requirements don't change much, it seems. Like, you don't have much to improve in the already
super-niche titles that show you the whole process of erection or the "penis pranks"
I think, it's just:
more actual topical stuff (be it the things having to do with motivating the team in various ways or the girl trying in various ways to untie the cock and balls without touching them, etc.),
cuter/beautiful-er/sexier actresses (any of those or all together work),
bigger tits and ass specifically are usually better as well (unless, again, it's a petite etc. fetish),
bigger cocks and balls as well
Maybe if the title only has one topical scene (like with the penis pranks: if it only has one actress, then the first scene is usually the prank one, and then it's just regular sex, more or less), then why not make more?
I would much prefer it to be a compilation of just the topical scenes, in this case pranks, or at least, if it's the same actress, let her help as many people in need as she can within the duration! Like, the Japanese like game shows, right? Why isn't there a gaming show about that yet?
Like, you lock 4 or 5 guys in different parts of the city, and she has to go from one place to the other, sharing her experiences in short "intermissions" while she's in a studio van. Maybe have the first scene to be a regular one, then the second be with something at stake (like if she can't untie him in time, he gets to choose what to do with her sexually), and the third one is with two guys, where she has to try and untie them both at the same time, with time constraints
Maybe there's League of Penis Pranks operating in the cursed city of Peniyama, and she somehow gets involved in their criminal activities... I mean, who is Japanese? Me or them? I expect
them to surprise me, create anime-ish vibes, etc. not the other way around
P.S. Also, they could make specials like they often do: one for MILFs, one for petite girls, one for busty chicks, one for big-assed chicks, even one for Western pornstars. Imagine someone like AJ Applegate working as a temp nurse transferred to Japan (as part of an exchange program between hospitals). I'm not sure if it's allowed in JAV, but they could find the biggest cocks they could in Japan (I mean, Japanese ones) and have her watch her Japanese patients go hard for her, and she could be all bitchy at first about the size of their dicks, before she sees them, and then switch to this catch phrase, like, "They're not small at all!.."