User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170331222853/@comment-82.60.161.59-20170401142225

I doubt Rias will manage Issei's harem because, as we know, she will be a very busy woman and, moreover, Venelana manages Zeoticus' harem, but she is the only wife. However Issei will marry all his lovers.