User blog comment:B214/Question & Answers 5/@comment-66.87.82.187-20150410230607/@comment-26216310-20150410231739

Only thing tht didn't make sense for me was when rias formally introduces herself to issei after reviving him. I mean the guy woke up the next day and she was naked on his bed XD, and whats more is that she was ok with it and completely at peace XD. But due to isseis character as the story progresses, yes they would work out seeing as how issei would gladly give his life for rias and protect her at all costs, even going as far as to give up his arm to ddraig to save her from her engagement with raiser. He indirectly does show off a character that a girl Rias's age would like and taking a liking to. I guess it's also bc he doesn't try too hard, other than when it's something serious like her happiness or safety, but then again that also applies to all his comrades.