User blog comment:B214/Question and Answers 6/@comment-38501836-20190423095704/@comment-38340421-20190424004040

To be honest i can see Issei having at least 2 kids with all of his future waifus. At least two. But i still think there will be a few where he will have quite a few with them. Which makes me feel a bit said for Rias, because i would like Issei to have many with her as well, but the pure blood stuff will prevent that and only see most likely 2. :/ But who knows, the author might retcon something or add in something to change that. Since the originally he was to have only 12 wives, but that was retcon with the vision Issei got in the most recent volume. Which i'm glad for, because i always wanted Yasaka included to his many waifu list. :3