User blog comment:B214/Shin DxD 1 discussion/@comment-95.210.189.106-20180820141921/@comment-31137559-20180821035411

Every female in this series is going to be in Issei's harem. Even if they have a husband or boyfriend. It doesn't matter because they'll divorce their husbands and break up with their boyfriends to be with Issei. XD

Seriously for all we know Roygun is married and may have a child.