And you also know that corruption doesn't necessarily need to end with vaginal sex. It can always have more stages and be more debauched over time. Why does it need to be a endgame thing? Especially when the game is a sandbox?
You can implement afterwards several positions,role plays, threesomes and orgys, flavour text ....you call it.
The game is in risk of stagnating or already is. The first game "Corruption" by Mr.C despite all its short comings had a much better pace for a porn game. Period.
Different sexual positions don't signify furthering corruption. A woman isn't more corrupt for wanting to do doggystyle over missionary. I agree that there are stages past vaginal sex that can be explored; Mr.C's previous game, corruption, did just that with anal sex and slavery, but that's just it - there were many stages before vaginal sex, and just 2 stages afterward.
When thinking about corruption as a narrative arc, we can use
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to chart the various stages. In that context, I consider the leadup to vaginal sex - kissing, handjobs, blowjobs, etc - to be the rising action, while vaginal sex is the climax of the woman's corruption, and the stages of further corruption afterward are the falling action and conclusion. From my previous example of the fantasy story, the leadup to the fight with the demon king is the rising action, the demon king's fall is the climax, and the celebrations, journey home, etc are the falling action and conclusion.
There is story left after the climax, but the climax is the "destination" of the journey, and so it needs to be toward the end of the story, where it's anticipated throughout and cathartic when it finally happens. Vaginal sex is that "destination" for this game, and so it needs to be held off to the beginning of the end of the game to make good narrative sense, even though there are further corruption stages to explore afterward.