User blog comment:B214/Volume 22 spoilers/@comment-62.121.99.36-20180120170306/@comment-62.121.99.36-20180121003728

Yeah,I understand that.For me it might be that living in a society where only one man is married/engaged to only one woman at a time makes it a little bit difficult to accept that  not only Issei but also Akeno and Rias seem preety ok with the ideea of sharing each-other.But then again,as you said,it's his dream and it is fun to watch how it becomes actually a reality.