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Just to clarify, by 'strong-willed' you mean she offers significant resistance? It's to ensure she isn't dick-mindbroken too easily, correct? That way, there's a sense the bull has to really work for it, and her resilience fosters a more psychological and protracted struggle.
It's just I think about games like
Golden Cynicism and
Knightess Whore. In this case, 'strong-willed' refers to their focused determination. They view sex instrumentally, to achieve their goals - and they don't develop an addiction to the dick. However, there is no actual 'resistance' to the acts of sex, quite the contrary; their willpower is directed towards their objectives, not against having sex.
You've hit on a key point: the idea of the bull sharing the conquered girl with others, particularly involving DP acts, is indeed a very hot aspect.
Yet, it's frequently overlooked in NTR games. That's what we lack in the masterpiece like A Promise Best Left Unkept, for example.
The reason lies in NTR often being framed as a sort of reverse-romance, which is why this dynamic is more commonly found in trainer and FMC-corruption games.
I recall how people talk about the Henteria Ch.3 in this regard,
there, and many fans feel seemingly upset that characters in an NTR game will have sex with MORE people, yes.
"With Netorare I don't like gangbang or sharing because that takes away from the feeling of the NTR for me. If the girl is just a town bicycle, then I feel like the MC dodged a bullet and its a good thing he's not with that whore anymore. While if he had the girl stolen by what is objectively a worse guy, that in normal circumstances he should not lose to, then that's a big bonus for my enjoyment."
By the way, as for doujin, I'd recall
Akebi no Mi - Yuuko series.
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