@takashichea: The creators might be appealing to the moe crowd. I guess people think this is cute. Another equally weird thing is that Kirito is still allowing Yui to call him daddy. In the sense of plot, I don't see why he still allows her to do that. When they first they first started to pretend that they were Yui's parents, they had thought that Yui was a real child. They did it so she would feel safe. Now everyone knows she is an AI and she knows everything about herself. I think it's just fan service of a different kind at this point.
The MMO business must be huge in Japan. I don't think the United States would ever allow another MMO to exist after it has killed 4,000 people, especially one that uses the same code as the previous SAO. Why hasn't Kirito heard of the new fairy MMO? You would think that the return of something that trapped over 4,000 for two years would make national news, and not just a 30 second bit on the television. At this point, I think SAO has abandoned any pretension of trying to be realistic.
The blond girl at the end of episode 16 could have just logged out or allowed herself to be killed. Without the threat of real death, there really isn't any consequence to player vs player fights. Hopefully, they find some way to add consequence to their deaths.
I had thought that the incest thing was something the animators had thrown in to increase ratings, but it's actually in the novel. This could mean that this side plot might go somewhere.
The siblings of before had now become cousins; yet even Suguha did not understand how it ended up like this.
But something did change. Although she hadn't really thought about it up until now, a small secret continued to flicker within her heart.
Maybe it's possible that she liked Onii-chan; but if it's like this, then that was probably fine.
Kirito's cousin is the blond elf girl seen at the end of episode 16. The show will probably portray this as a huge plot twist, but they kind of spoiled it with the opening.