User blog comment:Collbrande-Ex-Caliburn/Hyoudou Issei's Peerage composition hopes/dreams/hypothesis/@comment-10330822-20161112235347/@comment-24549585-20161113055136

For Ise to try and make Rias his queen would be a huge social slap in the face, since Rias is a high class pure blood devil other high class pure blood devils would look down on the Gremory clan. And at this point in time nothing has really changed the social standing in the devil world.

And how would things work if Rias and Ise had matches at the same time, how would that work out?

We do know that Ise won't take Irina because she does not want to be a devil she still has her faith which is important to her, she just wants to be with Ise.