I love the mental gymnastics Lisa have been doing to convince herself that everything is still just fine. If she were just oblivious, like it's so common in this genre, I think the illusion would've been broken already, but the slow pace and the the insight into her reasoning make it so hot.
For the same reason, the lack of Yuto's perspective and reasoning behind his stupidity makes him too insufferable. I guess that's just what the dev wants us to feel about him. His lack of comunication makes him insuferable. At this point there's no pain behind the NTR, it has become completelly justifiable.