This VN brought in a lot more real-world life and consequences than your average AVN does which is why it's so popular. But you put it beautifully, it's easy to sit back and say well I'm innocent because she was doing it to the MC like meeting her in the first place isnt a betrayal all of its own.Ana had made her decision based on the belief that she could use it as leverage, but the only way to win that game was to not play that game. It is a question of utilitarian ethics vs deontology at that point. Ana is fully responsible for her corrupt decision and is looking to make him an accomplice to her corruption. By going to meet with her he makes himself a rational moral actor in the outcome and thus is taking responsibility for the consequences of that meeting one way or another. You have to decide if actions have a moral weight in themselves or if you are a consequentialist. In some ways, it is a question the entire game is asking.