You haven't mentioned
Anyway, as I have already written, the NTR genre thrives on the corruption, and preferably in a hidden way. Contrasts and secrets are essential here.
That’s why, for example, an inherently mysterious magical fantasy world with its vivid tropes works exceptionally well for NTR. And it’s more effective than sci-fi or modern settings because fantasy inherently emphasizes the importance of individuality and the very idea of personal supremacy.
The brighter the light, the darker the shadow.
And that's why you actually could notice that NTR is any genre is successful to a degree where the circumstances are fantasy-like in this regard, we need female characters with strong social roles (Student Council President / Teacher / CEO / and family-ntr with Mother/Sister, meanwhile fits in the same category ) to get an emotional impact. That's what is actually important - and that's how we, sometimes, can find more fantasy in a well-made school story then in more mechanistic case of some literally "fantasy" game, if it's made not well enough.
Anyway, the point. "The bigger they are, the harder they fall." "Oh how the mighty have fallen." Breaking the strong, hunting the strongest prey is the most ancient and powerful romance of the mankind. It's not necessary about the literal power of a character or her social role, but more about the emotional intensity of her image.
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