User blog comment:B214/Light Novel Volume 16 spoilers/@comment-162.202.198.72-20131021085614/@comment-16281343-20131021091738

Even though that is your opinion about Ise, I have to shut that one down..

There is not one occasion in the story where Ise asked anyone to join his harem. Heck, he doesn't even know that he already have one.

The only relationship Ise has with a girl that is explicitly acknowledged or stated in the series is with Rias.