Usually this routine is not shown to us... I'm not an expert in NTR, but I wonder why the authors do such plot moves at all, as Fujino did in the last update. This is a rather cliched move - the erroneous detection of a partner's infidelity and revenge in response, but why are the authors trying to justify the character who is cheating in this way?
Fujino tells us that Asuna already has a history of cheating with Oberon. Then we are shown Asuna having bad sex with Kirito. Plus, we are told that Kirito cum quickly and little. We know it's because of Suguha, but Asuna may well have misunderstood Kirito's problems, think about illness, or something similar. At this point, it would be quite possible to make a smooth transition to accepting virtual sex with Inoda. The transition is based on the usual bodily desire and comparison - sex with Inoda > sex with Kirito. Just for the fun of it. But for some reason, Fujino preferred shock therapy, meanwhile, giving a moral justification to Asuna. . Kinglionheart is right. I don't understand this move either.