@Korvalus It can be applied to both "official" and "unofficial" couples. But it all depends on how you perceive it, the appeal is the feeling of jealousy NTR inspires. The appeal of it could be likened to why people go for nakige (Emotional Impact). Good NTR makes you feel trapped, helpless...
@mommy You can use it in that way too. Basically that's the whole premise of the story is two classmates helping eachother to get with their crushes, over time develops feelings towards eachother. In one instance, MC being "Seduce" by the Main Heroine throughout the story will lead him to make a...
@Kinji It depends on the readers perspective, if you're identifying yourself as stealing the girl it will be Netori for you or having the girl stolen from you then that would be NTR for you. it's just a matter of perspective on how you read those type of genre's.
@mommy The main protagonist's loved one's are taken or seduced away from him and the heroine might be willing or unwilling. This is to cause an emotion of deep jealousy on the reader. Being drugged, raped or blackmail are just extra toppings of emotional despair in other words the main heroine...