User blog comment:B214/Question and Answers 3/@comment-4547267-20140626140349/@comment-16281343-20140626160947

And also by the time that Issei has his own kids, the parents on the Underworld will be the kids, both high class and lower ranks, that idolizes Issei as the Oppai Dragon.

So, if ever that time comes, his children would be welcomed because they are the children of the Oppai Dragon.