I'm still at a disadvantage in that I'm a mac user who hasn't played chapter 9, but I'd say a few things:
1) The "adventurousness" thus far has mostly been Anne fucking other guys and the MC fucking a small percentage of other women. Which is fine, and fun, but it'd be more interesting to start tying all that into a more cohesive narrative. The MC needs to be more involved in Anne's fun, aside from pure voyeurism.
2) Anne has really, really fucked a lot of other guys. Again, that's great and a valid (and hot) path, but a true "hotwife" path needs to have a commensurate amount of MC/Anne sex along that path. I think the balance is a bit off in favor of the other men, at the moment.
3) The idea that the MC having his own secret fun has consequences seems important. I gather, from the above, that it finally does in 9, but I'd love to see it made more explicit. As in: I'd like to see the MC's choice to be with (Nicole, is it?) be a consequential moment about which Anne knows and encourages (as in the current game)/Anne doesn't know/Anne knows and hates it trinary choice.
4) The game as I've usually played it to the current end, letting Anne do everything she can (and again, I haven't played 9) feels like a game in which she's going to cheat/leave/dump the MC. And if that's your gameplay goal, that's cool; you write the game you want. But my point is that if one can let Anne fly her slut flag and still come back to the MC in the end, it's not really satisfying that goal; Anne is already acting out. Ideally, there's a full corruption route that allows Anne to screw absolutely everyone but keeps the marriage intact. Or maybe its your intention to punish full sexual immersion, which would be an interesting gameplay choice. But if the latter, it'd be good to be warned that she's on the verge of pure abandon before dad shows up.