Kirito and Asuna shows how surprising the shy people can do. Kirito says that he wants to stay with Asuna for one night. It gives Asuna a wrong impression. It shows Kirito's mental age is still in elementary school. Doesn't he feel nervous when he is in same room with a girl. Again, had sleepover party with Sachi, and he didn't do anything to her. Then again, Sachi probably curses him for such a stupid virgi. Scratch that, maybe Sachi only thinks Kirito as a friend. To show the affection, Kirito need the girl to take the initiative.
When Kirito expressing near death experience, the first person flashes into his mind is Sachi, Then, Asuna flashes into his mind twice. Surprising, it's not his "younger sister". It seems Kirito is very concerned about her.
Kirito's state of mind is probably something as