That's complete bullshit.
The MC is away for long periods of time, there would not be unheard of if the wife would be looking for some loving outside the marriage in that case.
However, what happened between the older daughter / female MC and the Queen, could actually be construed as actual NTR. Except that there is no sexual relationship between the older daughter and the MC at that point.
My position is far worse then you think What happened between queen and Shani in no way shape or form coulda been considered NTR even if Queen went down on her and fucked her with a strap on why? Exactly what you said no sexual relationship with her existed.
Two you're equating cheating with NTR and thats not my definition. Your WIFE would not leave the most influential man in all of Zaten for some booty call she fucks while you're out working also if she did she'd be risking her life quite literally.(because it's against the law of Zetan) That's my point. You see if someone was going to NTR MC he'd have to be able to overpower MC disable him and take what is his. He would have to be present. in the city at the time that the cheating occurs for it to be legal. It's illegal to touch what belongs to a desert stalker of the queen while he's away.
But the law of the land is MIGHT makes right so if MC is present overpowered and disabled what is his could be taken from him. I'm just saying lonely housewife story doesn't work in this scenario unless both Zahra and the perpetrator have death wishs. Not just from MC himself but also the Queen of Zatan.
Now could the Queen NTR you? Yes but only her. And I'm pretty sure Zotan wouldn't stand idly by and allow it because he's not a Beta he'd die before he let that happen.
Having your wife step out for a night is not considered NTR to me. NTR is being left alone physically and emotionally by someone you loved and that loved you.