Talk:Kazuki Hyoudou/Relationships/@comment-2606:A000:EF87:600:D9A0:28B:F121:66A-20180409020409/@comment-204.116.19.27-20181105215345

To put it bluntly, if Issei and Rias wed, Sirzech would be Issei and Kazuki's big brother-in law. At the same time, Rias would be Kazuki's big sister-in law. Basically, Sirzech would have two little brothers and Rias would have one little brother.