Need some recommendations for the corruption genre

I am a big fan of the corruption genre and I've played quite a bit of those and now I kind of want something special.

I want an eroge (visual novels) or maybe a RPG Maker game in wich you play as a female and you fall to the evil side via sexual corruption. But i want this change of sides to have some importance to the game, not just one scene at the end. I want this change to be the reason why the evil guys won, like maybe you go against you old friends and kill them or maybe even capture and corrupt them too.

Both English and Japanese are all right.

This is my first post so do tell me if I make any mistakes.

Well, now I've looked through it but, come on, 200 pages is too much to read through. But it was useful, I found something that may be what I'm looking for and while I was at it, some interesting games that were not necessarily what I initially wanted. Too bad most people there aren't looking for the type of game I'm looking for.