Every Monmusu game is already about straight reverse rape. Koikatsu rape roleplay exists, in which you can recreate your waifu. Degrees of Lewdity exists for pedophiles. Every single game which is just focusing to be a hentai game about rape is a visual novel, no knowledge of programming is needed for a VN, just an professional artist specialized in drawing Japanese stylized comic art, because no one would want to masturbate to amateurish scribbles.
Good perverted games have optional rape scenes for every (female) character or they are important parts of the story like in Evenicle, Rance or Monster Girl Quest. The RPG Maker game Black Souls for example gives the option to nearly rape all females, but it's optional and doing so will remove the character from the game's story in the current walkthrough, but no one ever played BS for the porn, because it has amateurish scribbles like previously mentioned.
