I don't play these games but I've seen most of them are the same, why not add a route with an aura of "genosida" like in delta rune that ends up self-destructing the protagonist or another one where we can be better that doesn't feel like a simple road to travel.
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A unique thing about fantasy is that generally in literary and entertainment works, in order to carry out such things, it is usually necessary to eliminate or block others.
For example, in horror stories/movies, victims are reduced in meaning and their sense of survival is eliminated to a certain extent, since it would be complicated to adapt to the plot.
In the case of the Netorare genre is easy because being a female fantasy is generally their desire through lust expressing dissatisfaction with their partners and their desire so they seek the maximum benefit not to mention that they choose behaviors very rarely seen in men.
It's easy to bully someone but it's very likely that if you try to pull too much on that point at some point that little fawn can turn into a monster. Putting that aside why not give him a route to dominance by turning your little guy into a monster how far can you go to establish your relationship he already saw that the pure flower he longed for is nothing more than one that gives its nectar to anyone so why wait even if it means killing your supposed best friend, who to your love is weak to submission? Why not submit her even if it means breaking your relationship.
Turn the young hero into an even worse villain.
Yes, I prefer to be ambiguous so as not to get too much of my ideas into the story.