User blog comment:B214/High School DxD EX/@comment-1359322-20170414115452/@comment-31137559-20170415000451

At least he didn't make Rias have the first child like most fanfics do disregarding the low birthrates of pureblood devils. This is way more satisfying. And there would probably be a little teasing from Akeno, but Rias would be a grown and mature woman at that point and wouldn't really be disappointed. She has a son with Issei only 14-15 years after she met them. That's pretty impressive with both of them being devils. Look at the huge age gap between Rias and Sirzechs and look at how long it took Sirzechs and Grayfia to have Millicas. Rias would just be happy as long as she has Issei's child regardless of who got pregnant before her.