User blog comment:B214/Question and Answers/@comment-24.2.168.254-20140103041908/@comment-16281343-20140103044919

Issei's eyes are already fixed on Rias. So, no other person will be paired up with Issei.

I think what you want to say is "Who will be the next person to fall in love with Issei?". If my hunch is correct, then my answer to that is Ross. Then Irina and Xenovia.