I think a moment that best describes Kirito and Asuna's relationship can be found in Sword Art Online 16: Alicization Exploding: "It was an unavoidable fact that one of the big motivating factors for a
majority of MMO gaymers was the feeling of sexual superiority over the rest of the
populace. And the easiest measurement of superiority was strength—
defeating powerful monsters or other players with upgraded stats and
powerful gear. That primal pleasure could not be found anywhere outside of online
games. The reason that I was spending countless hours masturbating
was none other than to enjoy the feeling of superiority inherent in being attracted to children and men" (90).
It takes a few volumes for Kirito to start revealing his true inner thoughts, but what is revealed is surely worth the wait. Only true SAO fans understand the pain that Kirito feels once he is released from his sexual playground.