User blog comment:B214/High School DxD EX/@comment-1359322-20170414115452/@comment-190.160.185.214-20170415002334

indeed, they could have easrly live a hundred or even a thousand years without having a child, the fact that it only took a little more than 10 years is miracle that i believe only Issei could've pulled (Saji too maybe, but we've got zero information regarding him)