User blog comment:B214/Shin DxD 1 discussion/@comment-34061653-20181119044210/@comment-34061653-20181120194000

The reason why I'm guessing a Maou can't have a harem is the political aspect behind it. Many nobles would try to marry their daughter off to a Maou for political gain and also there is the problem of having an heir. This is why Millicas last name is "Gremory" instead of "Lucifer" like Sirzech because a Maou is ment to be a symbol.