For information only: He joined May 12, 2019 ... so this account is not really "new"
After following the opinions and definitions about NTR in various forums and Discord channels
(where I also got the graphic from), I would say that a lot is referred to as NTR that is actually just jealousy or envy.
Not that NTR doesn't give the viewer the same feeling ... but some characteristics are often missing.
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I created from the picture above a new graphic, cause I wanted to know, if this is ntr too or not ...
others weren't sure what this could be called. ... so it seems it is kind of extended version of Netori.
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From my point of view, the thing is that Darnell is the MC's opponent /hate figure here.
Therefore, any scene in which Darnell has physical (sexual) contact with a person
with whom the MC feels a bond is a trigger for jealousy.
The jealousy can be used by the storyteller as a stylistic device to let the MC understand
what feelings he has for someone or how valuable the relationship with the person is for him.
A competitor or opponent enlivens the story ... and gives the MC / player the possibility
of conquering and / or protecting his "beloved".