What am saying is that just because Lena has hooked up with Ian doesn't mean she is cheating on Ian if she then decides to hook up with Jeremy. She doesn't own Ian anything just because she casually fucked him once or twice. Just like Ian who has fucked Cherry isn't cheating on Cherry if he then hooks up with Lena. The characters haven't promised one another anything, especially exclusivity of sexual contacts.So, you are saying upto now there is no way Lena can fuck jeremy if she fucked Ian before? There is no chance for cheating by Lena on Ian with jeremy?
So yeah, currently there's no chance for Lena to cheat on Ian with Jeremy. She can cheat on Ian with some other people (Axel, Mike, Mark and i think Robert. Some would say also Seymour, and Lena herself thinks Ian would never approve of her "contract work" if he was aware of it. There's also Louise and Ivy, but here Lena isn't sure if this "counts as cheating")
Since Ian doesn't express jealousy, by your own logic it is not NTR. That he might express it down the road is moot, because he just as well might not.But, according to NTR meaning, atleast in f95, even though it is not cheating, atleast if MC(Ian) is jealous about potential love interest fucking with another men, which I think Ian might express in later updates, sure it is termed as NTR.
NTR definition on f95 is frequently taken to absurd lengths that's "It's NTR if it upsets me (and everything upsets me)" by idiots, so i wouldn't exactly take it as a gospel, or even much of a guideline.
Yes, if such option actually appears in game then it will be cheating/NTR. The point is, what's currently in the game between Lena and Jeremy doesn't meet these criteria.Or if Lena somehow gets option to "cheat" on Ian with jeremy even though she is in relationship with Ian (which may be available in future because of NTR fanbase), then it will be NTR according to your defination also.
Or he will not. You're allowing your presumptions to drive your conclusions. That's a very poor logic, or frankly complete lack thereof.So, yeah Jeremy might not be a shit friend according to your defination and analysis, but he will be sooner or later.