The disease is a pretty good explanation if you need to make such rapid changes in Asuna look more realistic. After all, a little more than a month has passed in the game and Asuna, who had been Kirito's fiancee and girlfriend for several years, abruptly became a suddenly she became a slave to a member of Inoda.
Even the fact that Kirito is bad at sex is a so-so explanation, so he came up with Asuna's sexual torture from Oberon and the disease. In the first part, there was a dream where Asuna rode Oberon, but there it was just a dream, it was not explained in any way. Apparently, because of such moments, Fujino decided to abruptly end the first part on version 0.41 and make a story game.
I wouldn't be surprised if there's a scene in the future where Kirito shouts, "Asuna, what's wrong with you? I don't recognize you." Asuna "Blah blah blah I'm a slave to Inoda's dick, I love his fucking dick" and ahegao in full screen.
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