User blog comment:B214/DxD Zero: Sirzechs story/@comment-32573280-20181128104858/@comment-2601:8C:601:5692:908D:AFA0:DD2D:9448-20181129190141

I would say that "love at first sight" may be normal for all those of the Gremory bloodline (perhaps an extension of their "affectionate" nature), while the fact of Gremory males being captured / dominated by their wives is more of a "learned behavior", so to speak, rather than an inherent nature of family members.