Usami: “This is sex, isn’t it?”
Masseur: “Not at all! This is a “vaginal massage”! There is no way I’d actually have sex with you.”
Usami: Understandable.
In hentai or IRL, there are those who should play poker (*cough*) and those who shouldn't. The massager should be a riverboat gambler, more so than being a massager...and Yuuki should avoid a card table or getting a bookie bc he has terrible luck all across the board. None of it is his fault, but he still has a streak of losing hands regardless.
Because it -is- just Cheating. Netorare involves the significant other finding out about it in some way and being affected by it, which in this story they have not.
Yeah, your definition is the same as what other commenters have said and outside of Fakku! idk, it might be correct. However, the stories of this type here has always been tagged as a netorare, and I don't see any difference in this story that would make it any different. I mean, how is this any different from Kirimoto Yuuji's NTR Relaxation? And in the vast majority of Fakku netorare's, the MC/victim never finds out.