User blog comment:B214/Volume 21 info & spoilers/@comment-72.50.80.116-20160522225646/@comment-30006382-20160919003229

Yeah it has been bothering me for quite a while. Here are my thoughts: 1) maybe she was comparing her relation ship to the relation ship between grayfia and sirzech

2) that one makes me kind of anxious, but what if she thought of them as yet another faul couple? After all, it seems like Issei will keep on rising even futher from now on, both in ranks and in power. This would mean that he'd have less and less time to be with rias which could make their relationship a very tough one. Even ExE supports this theory as it's been implied that Issei doesn't have time to fuck around anymore (his schedule was filled up for the next 200 years).