User blog comment:B214/Question and Answers/@comment-94.128.225.24-20130127045105/@comment-68.203.220.111-20130326170652

I figure it's pretty much useless to rank the girls in order. Some girls have no interest in making themselves official wives like Akeno, Xenovia and Ross they just want to have a loving relationship with him or start a family with him. The ones who probably will marry him are Rias(fiancee), Asia(unofficial fiancee), Koneko(Isse pretty much accepted her proposal), Ravel(will probably marry him) and maybe Irina(though I doubt it will happen). There was no official agreement just what the Phenex family wanted, they noticed Ravel had a crush on Isse and they thought "You know what? He has amazingly strong genes, we got a daughter who likes him, why not get in on that action."