Regarding your first question: On the deterioration of the relationship in BWverse, the ten years from 2001-2011, there is is a whole bloody treatise that asukajude wrote. I'll dig it up tomorrow and translate it. I kind of hinted at it in Primogeniture, and it was indeed the seed that started the whole BW series, but I realize it really needs a lot of explanation for BW to function logically since I (and my co-authors in Chinese) filled in so many blank years.
As for "a sexual manner", I am not sure how to say this in a polite way, and I'm kind of praying that you wouldn't run away in horror when you read this, but BW is a slash series, even though that element is very faint in the parts written in English. Their relationship has a lot of components, and to them, both being borderline asexual, the sexual element is like an afterthought, an imperfect echo of the mental connection.
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As for "a sexual manner", I am not sure how to say this in a polite way, and I'm kind of praying that you wouldn't run away in horror when you read this, but BW is a slash series, even though that element is very faint in the parts written in English. Their relationship has a lot of components, and to them, both being borderline asexual, the sexual element is like an afterthought, an imperfect echo of the mental connection.