User blog comment:B214/Question and Answers 4/@comment-5.36.157.93-20150201090933/@comment-25032153-20150203044914

all the other girls will be allowed to have kids after the legal wife has her and all of Issei kids would be in school together and becaus they are dragon kids meanng that Rais kid might be classified as a devil dragon of destruction meaning that it has a huge power and talent with devil magic. the other girls would want dragon class kids some would gain the power from the parents making them fame like Rias when they went to the underworld the first time.