I figured it has to be something when you are at the computer and select NTR. After that, you either speak to Rachel about it (netorase) or keep it a secret (netorare). Those two words have been "discussed" so many times on F95 that I'm always left confused. So, I guess when you discuss with Rachel your feelings, you are on a share Rachel with others path and when you keep your feelings to yourself, it's a cheating path?
Depends on your path/choices.
I asked about the 'faithful' path earlier, Dev said there's a code issue that will be fixed in next update.
Otherwise, yeah, if you pick netorase it'll be consensual, netorare will be cheating.
As for netorare vs netorase.
They're both Japanese terms, and semantics/meaning doesn't always translate well.
Generally...
Netorare - yes, cheating, cuckold, without MC's knowledge/consent, and wife/gf/LI is at risk of being stolen away...
Netorase - best English translation is wittol/wittold, an English word that is considered archaic and no longer in modern, common use. It means knowing, acquiescent cuckold. But since cuckold has a negative connotation, in porn/fetish terms, the word netorase pretty much covers all situations where the husband/bf knows, consents, or encourages, his wife/gf having sex with other men. So, it covers cuckold fetish, hotwife, sharing, stag/vixen, swinging, etc...
The primary difference of course being, the husband knows about it...
People try to make NTR vs NTS more complicated than it really is, but that's because of the negative connotation and lack of understanding about the meaning of the word cuckold, and by extension the cuckold fetish...