Well let me address all of this one by one.
Sorry to be the bearer of bad news, but this isn't going to happen. One, he despises her and wants nothing to do with her. Two, he wouldn't betray his girls trust like that, he is a good guy, not a villain. Lastly, IIRC the dev has already commented on this before saying it won't happen I do believe. (Could be wrong about the last one, but it still won't happen regardless)
There will be some drama of sorts happening with the families coming up, as soon as the next update likely, so things will get "spicy". However, I've thoroughly enjoyed the more slice-of-life cozy vibes the game has already been giving off, I haven't found it boring at any point.
This is a KINETIC NOVEL (as seen in the tags), it will never be a visual novel with impactful choices on the story. All the choices in this game will be largely flavor/kink/sex related, and won't impact the story in any meaningful way. This has done been made clear, there might be some choices that make some slight variation in certain scenes, but everything will eventually lead to the same place.
VIA the Developer Notes -