The blowjob at the campsite seemed to be the last time Asuna mentally apologized to Kirito. After that, apparently, she stopped feeling guilty.
I think it's more likely that it's not fatigue from the game, but just a misunderstanding of what is happening. Okay, we who play a new update every month. But imagine people who play the whole version from the start - the behavior and characters of the characters at the beginning, and then, after 10 hours of play and a month of in-game time, they see completely different behavior and characters.
As for NTR, I think that proper NTR is where the person who is being stolen is not emotionally connected to the person who is stealing. That is, Asuna can be lustful and want Inoda's cock as much as she wants, but she should only be emotionally connected to Kirito (she should love, cook dinners, and so on). It is this aspect that should cause emotional suffering to the player. They love each other, but the body belongs to the other. Many authors forget this and believe that for NTR it is enough to designate an official relationship between two people. But no. This is a mistake. This mistake was made by the authors of Turning the page and King Summer. In the middle of the game, the heroines fall in love with the one they cheated on and completely forget about the existing partner. And Fujino made the same mistake. Although I do not know, maybe it's because he does not know how to prescribe a normal, healthy relationship? After all, this had never happened in his games before. Or maybe Fujino doesn't think it's important. But no matter how many times they say that this game is a parody, do not forget that this is a parody of the strongest and most famous couple in the entertainment industry. A couple that has been around for 22 years in the form of novels, anime, and games. I think many people expected Asuna to be STOLEN, not that Asuna would become a hypocritical, selfish whore.