I think the only way to have that would be a parody game. You know, world is lewd, your MC is dense/innocent as fuck, he travels the land to face the champion.
Towns are thrmed after fetishes: Latex city, muscle village, cunny town, etc. You get meme badges: a condom from rubber gym, an uoh face in cunny town, lipstick from bimboland, stuff like that.
Evil team is based around degenerate rapists, MC saves both male and female asses.
E4 are modeled after
>>51495086, champion is a lonely angry girl, you beat her ass, she rants, you calm her down, and kiss her.
You were her childhood friend, she moved, she returned angry because she never loved other than (you), you went for her, and now that you are together, you'll never be apart again. Vanilla rules supreme, end game.
No postgame (or at least not beyond Gen 1 postgame)