I can't imagine an ending that's so different from what's been mentioned here before, and I don't think it's going to get away from it much, but I think that in the next update we'll probably see Sophie without her wedding ring, which could make Felix angry or sad, and she can give a terrible explanation, like: I must have dropped it somewhere or I took it out because it was rusty, anyway, she spent practically 2 whole days with Zack, probably in her own house, they must have done that every time possible places, when Felix comes back, she will be bolder than before, I don't doubt that since Felix is dumb as a stone, he will come home, very tired and find the two of them fucking in the bathroom, and simply not notice, due to the bathroom door, and Sophie makes him go out to buy something, as an excuse so Zack can leave, without being noticed.