No, don't get me wrong, the FMC's cheating scene is still very sexy. I feel the story is "miserable" because of the inhuman illogicality. For example, IF my boyfriend caught me cheating, I would only expect two results: He would let me cuckold him, or break up with me, right? It's called common sense. But in that game, the MMC neither accept FMC's cheating nor leaves her. He almost took his life because of his girlfriend's cheating, but after that, he stayed in the relationship with FMC until the next time, he found another footage and got furious with FMC, AGAIN! It seems the MMC is asking to be tortured and abused, so it's illogical.
The story is more nuanced than that though. It isn't a simple cheat story, the MC is broken just as she is and became mentally attached and damaged through her abuse on him. You do realize she abuses him do you not? That even as a child she was abusing the MC, likely not "intentionally", but as a secondary response to his attempt to help her.
In that, he became a very damaged person as she is. He stays with her because he has built his entire world around her since he was young and he doesn't know what healthy is, how to experience it and he is attached to her as badly as she is to him. He can't leave, his mind just won't let him accept it which is why he justifies her behavior, her continued abuse and manipulation.
There is a "reasoning" to it, maybe a bit fantisful, but it is a reasoning that can be justified to a tangible realm (unlike most NTRs which honestly, the MC is just beyond moronic).
According to either definition, NTR is about one party of the spouse cheating on the other party; we are on the same page about this. But, there must be a reason, or let's say a catalyst to start the cheating, right? A big cock could be one of the catalysts; the "big cock" is a common fantasy for girls and men who are into cuckold, and porn games are made to satisfy people's fantasies! That's why so many devs choose to do so! Because it's natural, it's instinctive!
There are numerous reasons. Big cock is the cuck theme and it proves as I said.. these "NTR" games are more about kink fetish, not NTR. NTR just provides a neat little package and process to run the fetish through. People grow distant for many reasons which can introduce a temptation for cheating, but many of those take "time" and "effort" to setup the relationship. The writer has to delve into the emotional connection between the MC/FMC, slowly build up their core "love" as a base, then show how this is slowly broke down over time which leads to the FMC being tempted.
In this game, the MC/FMC relationship doesn't exist. There is no love there, there is no real connection, the MC is just "some dude" she knows and first chance at cheating to get a quick pleasure fix, she takes it, because the MC means nothing to her. On its basic face, yes... NTR, girl stolen, but.. well... the entire point is not NTR, it really is just about the kinks be it cucking, humiliation, or BBC fetishes, etc... its
On the other hand, what is the catalyst for the FMC's cheating in the game you gave me? SHE HAVE a PSYCHOLOGICAL ISSUE, SHE USES DRUGS! What a HORRIBLE reason for a girl to cheat, I just kept thinking she needs medical attention while I was playing that game, she is not cheating, she is suffering from her illness. And those lousy formulas fundamentally changed the game's nature! Having sex with females who are unwell and unable to take responsibility for their behaviour is not CHEATING or NTR, that's statutory RAPE! So unreasonable, unbelievable, unthinkable, twisted, morbid, and illogical. That's why I felt miserable.
1. Yes and no... you need to read more in the story. She enjoyed it, she eventually admits it that she choose such. There are elements of rape, certainly... at times in the story where Mia has her completely wacked out on drugs and "changes the rules" i the parties. Still, she did gang bangs, massive sex acts, etc.... knowingly AND Approvingly.
Also, she cucked him... outright, planned, ignored his objections and pleas, etc... for the express purpose of appealing to her cucking fetish (ie jealousy kink with the MC).
2. MC is disgusted with her past, for numerous reasons and I really don't want to derail another authors game by discussing it. Needless to say, he has reasonable means to hate her, but at the same time, also a "need" to be with her, as she him. It is a messed up story, which is why it is compelling. Read it again, or... go to the forums and read the discussion, there is a TON you have missed in the story that clarifies things.
At the end, there are "reasons" why he stays and Lacey (as well as all the other girls who are just as evil in this) keeps making excuses and manipulating thigs (ie my poor brain doesn't work right, the drugs, poor me, oops.. etc...) which while stupid at times, all things considered works in with the MC considering his mental illness as well.
At last, no matter which definition we adopt for NTR, it still has nothing to do with revenge and violence. As I said, a girl cheats when her boy doesn't know; once she gets caught, that would be cuckold ---- NTS: Netorase. THE PARADOX lies in: if the boy doesn't know, how does any dev depict his mental pain, heartbreaking and psychological ordeal? If he finds out about the cheating, it would become NTS or GAME OVER, which is not in our purview.
It has nothing to do with pushing sex kinks either. It is about having your love stolen. NTS is sharing (approving) though which is not Netorare. The MC finding out doesn't end the story of his love being stolen. It can go in many ways after that. he can retaliate (it revenge) or he can try and win her back through some means, or for those who push the kinks yes... he can become a cuck and either share or become the humiliation dupe. Oh, there is also the alternate love interest who swoops in to save/help the MC after his loved one completely destroys his world (seen this one quite a bit).
Point is, how those stories play it all depends, the basic concept of NTR does not imply a specific path as you seem to suggest. In fact, there are numerous Japanese NTR games that have love stories of redemption, revenge, devastation and loss, etc... Some are really good too because they actually complete a true NTR story cycle of ups and downs and aren't simply a means for people to fap to. They also tend to have a TON more story, and fewer sex scenes.
Edited: If you were familiar with Japanese NTR comics that originated the concept of NTR, you would know 99% of them prioritise the female's psychological, not men's. Why? Because men are predictable, they would only take it happily or leave it resentfully in this case. It's almost funny to say a non-cuckold man could become cuckold because his girl keeps cheating on him, after he takes sufficient negative energy...
In the case of L&J there is a specific reasoning here, so the standard "man would just leave" is dismissing the entire story and the specific conditions of his character.
In most NTRs, once the man finds out, he takes action. What that is? Depends. In the NTR cycle, this is near mid/end of the story though and after that, his actions then focus on confrontation and remedy. This is why revenge is a nice element in the play and if you have read various cheating stories online, you know the various levels a man will go to if cheated on ranging from mild to extreme, financial to physical, etc... point is, there is a process and this can be a detailed progression of the story.
This also allows the MC to experience the reaction of the FMC finding out that the MC knows and how she will react. Will she turn villain and join the antagonist in further cucking/humiliation? Will this spur the MC into a violent revenge plot? Will she grovel, beg forgiveness, etc.. and the MC gets to see all the details of emotional conflict stemming from that side to which maybe he cucks her? Maybe he lulls her into safety of the relationship and then dumps here with nothing? Maybe she goes back to the antagonist , he gets tired of her and then kicks her to the curb... maybe he gets abusive and there is an eloquent poetry of karma, point is... girl stolen... story... what happens?
All of this can go on a bit, under specific story progressions to a resolution and understand, that resolution... can be a sad ending, but most of the games here "end" on the concept of being found and then it is just cuck/humiliation, roll to credits.
Yes, NTR... and yes some will have this concept in them, but as I said, there is a wide range of stories out there while the ones in the west tend to be all about cucking/humiliation fetishes for the players who for some reason want to play the MC, but identify with the cheater as opposed to playing a game where the MC is the cheater.
At the end though, as I pointed out, this game is cuck from the go. If we take the standard as you mentioned, Alan would have dumped the whore that night Blake was finger banging her in front of him and she was "enjoying" it. So the story appears to be less about NTR and more about cuck/humiliation.