User blog comment:B214/Volume 23 discussion blog/@comment-26821288-20170205085556/@comment-31137559-20170208154640

Possibly. It's never explained if reincarnated devils have the same birthrate problem. The reason why he got Rias and Ravel pregnant so early could be because of his dragon power or some other factor. Because getting a pureblood devil pregnant that early is nothing short of a miracle although it will probably be a while before he has another child with those two. I am glad that Akeno got pregnant first and that Asia got pregnant second(wonder how the Asia haters feel). But it's all but confirmed that Rias is going to be his first time. I really couldn't care less who took Issei's virginity.