User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-4547267-20140114065049

In the future, which of Issei Harem will be Issei wives or mistress. Here is my guess.

Rias: First Wife

Asia: Second Wife (if Koneko didn't "grow" at that time)

Akeno: First Mistress

Koneko: Third Wife (If she "grow at that time)

Xenovia: Second Mistress

Irinia: Lover (since she is a angel)

Ravel: Fourth Wife

Ophis: Lover (if she grow any feelings for Issei).