User blog comment:B214/Talk About What You Want! 2/@comment-24098614-20140918012609

I wonder is it possible for somebody like Issei to have a girl in the Harem that is a Heiress like Rias if he doesn't marry her, and just makes her into a concubine because I want to know the restriction of being associated with Heiress is still in play here because I think you can bypass this problem if you make the girl a concubine.

I am curious to know the answer because I want to know if it is possible to make it happen because I don't see this as something impossible to do so please enlighten me on this matter.