The scene itself is hot, no doubt about that. However, the way it's introduced surprised me a bit. Sure, there are men throughout the game who have their eye on Kath. And it was clear that after all the teasing, the first scene like this would happen sooner or later.
What surprised me, though, was how suddenly it happened. Many men had tried, Kath had her fantasies and struggled with herself, but she blocked all of them (for now). But then she suddenly lets her father-in-law inside her without a condom, and even ejaculate inside her? If he had at least been particularly ardent and skillfully seduced her, or if she had drunk a little too much wine, I could have understood that. I am eager to hear her explanation in the next part, where she will have to answer for everything. That's true, at the moment the scene makes little sense from the storytelling perspective.