I commented this on one of my posts recently, but it might have gotten lost in my ever-lasting quest of pushing the Suguha agenda.
But there is a way to get infinite prudence/ ´prurience´´ points, in the recollection room when you watch the first Sugu memory of her Hebishima BJ scene, you get to answer a question that raises the prudence stat as Kirito, and it doesn´t reset after the memory is finished, so I guess you can farm this forever if one wishes to.
There is no need for you to wreck your brain thinking about this, your lack of points is scripted by Fujino, I´m pretty sure that even if you were to have the requiered amount you wouldn´t be able to select that option, since there is no animation for Asuna´s shallowing Cuckitos Cuckseed in the cuckgame cuckfiles.
This was problably done by Fujino to show us the conseques of not having the necessary prudence points in future updates.
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Today, I won´t waste a solo Sugu image to push the agenda; instead, I will just post this where her superiority is self-evident.