wrong ntr aka netorare is not chucking its the act of cheating with or with out the cheated on partners knowledge. hope this clears it up, i know the definition ia difrent but when it comes to games, porn and hentai that is the most accurate description because for what your talking about is considered chuckhold.
Viewing post in Is the MC getting cucked or is he doing the cucking?
no ntr is not chucking at all cucking is when the person is fine and gets off to someone else sleeping with and "stealing their partner" , the big actual differentiation is that circumstances don't really matter with NTR so long as it hits on that core of someone being upset over a girl's affections being "stolen" from them by someone else (or even more generally just focused elsewhere). cucking isnt cheating its a kink and mutual with both parties.