Best rape games in my opinion are cumming... uhm... coming from Illusion games.
Rapelay:
Gained a lot of infamy in 2009 when some american group called "Equality Now" somehow heard about the game and started an outrage, even though it was never officially released outside of japan. This went so far that Illusion had to apologize and stop distribution of the game even in japan. Of course graphics suck by today standards since it's a 2006 game but it had some nice features. There is no story and so the game doesn't really have any endings but 2 possible game over scenes. Girls could get pregnant and if you didn't force them to abort you will be thrown onto the train tracks after a few days. The other game over can happen if you use the cowgirl position with a certain girl when she suddenly will pull a knife and stabs you.
https://f95zone.to/threads/rapelay-final-illusion.3115/
Play Club:
One of the first Illusion games to use Unity. All 4 main heroines and a female side character can be edited to your liking but with very limited options compared to later games like Honey Select, Koikatsu, Ai Shoujo and so on. This feels kind of like a reboot for Rapelay because the mother and two of her daughters look almost exactly the same like the characters from Rapelay but the short haired girl is older this time. Gameplay is pretty basic but it has a somewhat decent story for a game like that and even comes with a happy end. You can still have fun with the girls after the ending.
https://f95zone.to/threads/play-club-r1-museum-release-illusion.3280/
Play Home:
Released between Honey Select and Koikatsu. Again you can edit all girls to your liking with much more options than in Play Club. It's not a sequel to Play Club despite the similar title. Gameplay is pretty much the same as in Play Club and again has a story that is actually hilarious this time but I won't spoil it.
https://f95zone.to/threads/playhome-v1-4-illusion.5875/