Alright, I'm finally all caught up. I played the Erryn path and could see what people were discussing. However, I think everything is implied in their relationship. It probably will be a problem later on down the line, but for now, it works. They're clearly boyfriend and girlfriend, even if they haven't said it yet. It's likely why Erryn doesn't acknowledge it; to her, it's like, duh. This became apparent to me during the mutual masturbation scene when she just does it as soon as he brings it up without otherwise acknowledging the request.
That ending scene makes a lot more sense now. It's not about the danger to her father; it's about leveraging the situation to force MC back to Alvarado, even if he doesn't realize that more than the MC is stopping her from being blackmailed into banging him.
Off-topic: when he was talking about playing doctor with Erryn, and she said they didn't, there was only one other little girl that we know of that he knew when he was that age. Did he play doctor with