User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-3965848-20150524093458

After reading a recent update on life.0, I'm just going to assume that Kunou is already like a member of Issei's harem (at least in the same place as Ophis), her mother said for Issei to wait until Kunou grows into an adult.

Although Yasaka gives him an alternate suggestion in having her insted, since Kunou has pestered about having siblings and Yasaka hasn't "done it" with a young men in quite a while XXXD, this is when Kunou interups.

Wow, there's a line where on the other side series are regarded as incest and DxD is just one push away from becoming one.