User blog comment:B214/Volume 21 info & spoilers/@comment-26510794-20160331201613/@comment-27876048-20160412183028

Why do people think that Grayfia will become apart of Issei's harem? A. She's in love with Sirzechs and they've literally been together for centuries. B. It has already been established that she views him as a little brother. Seriously Issei may end up with the majority of females in this series but he is not getting them all