Well, Fuijno went off reservation with big cow Asuna, he's trying basically everythng now, that's cool but kind shit at same time.
Body modifications in ntr stories, are usually done only for 2 reasons, the end is very close or the author has lost the plot and need to do something to keep the players/readers engaged, shock factor for shock sake without any meaningful impact in the story, in this case or will be Inoda's fetish or a side effect from the quest or Liz equipment and probably will be over as soon kirito shows up.
I saw the old discussion FOG vs IRL show up again, IMO the problem lies in the fact that the FOG plot was done when the ritual as finishied that was the last thing to be done FOG wise, Fujino instead should focus in IRL events because is there, where the ending/endings will take place.
He did put Yui in the game on purpose to have a excuse to keep coming back to FOG, but i kind understant his stance, IRL events are harder to make, he cant keep using so many plot devices, like Inoda superpowers IRL because those make no sense at all being used there, remember what happened in the last update with Yui and Asuna phone invisibility BS, well that didn't went well since he had to come public and explain about it.
I get it IRL events demand more care in how they can be executed in order to keep Kirito in the dark, that's because the fans do make the distinction beteween FOG and IRL, in the FOG they kind accepted the BS plot devices, but IRL these same devices don't work from a narrative perspective and the fans will point this all, so Fujino has to come up with some new excuses to do the same, keep Kirito in the dark and at same time keep the tension in the story.