User blog comment:B214/Volume 23 discussion blog/@comment-28087053-20170318185110/@comment-10330822-20170319025626

I know what you mean. How I view the hot springs situation was more of a "p*nis what are you doing" sort of situation. It's not like he doesn't find her attractive, its just that he probably finds it weird.

Tell you what, you get a hot sister-in-law, have your brother leave for parts unknown and then have her give a pass at you and report back.

Also, the "siblings" word we are using should really be "platonic" not "siblings" there is a fundamental difference, "siblings" usually implies no possible romantic connection. I feel that word is being too used in this conversation. I'm not 100% Rias ever thought of herself as Issei's sister, more like his doating master. Diodora even pointed out that the Gremory act this way with all of their servants. So to be honest, saying she felt "sibling-like" isn't quite right because that almost slaps Issei into a position he was never really in. Saying something like that sort of implies that Issei never really was going to be considered as a partner, but in actually, that's just the first step.

Also, just because Rias and Issei also seem to have different viewpoints of what is considered to be okay in relationships. For example, she seemed perfectly understandable of the chance Grayfia could steal Issei, even though Sirzechs was married to her. This implies that Rias is more open-minded about relationships that someone like Issei.