This is not really a game, just a story, but I do really like these games like Good Girl Gone Bad for example, and many others, where a naive and innocent girl gets progressively more corrupted. And this has the added plus of the husband's corruption and submission as well, which is also hot, very much a mirror image of what's happening to the wife. It's a really well thought out story, where the other couple obviously planned this whole thing this way. I do approach this from the girl's point of view, though, so maybe that's why a lot of the negativity I often see with these games I don't really get that much.
Actually, are there other similar games where a couple corrupts a girl? It's usually just one person doing "the training" but I found the two of them working together was super hot.