User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-2601:87:8300:20D0:218B:4159:4552:51F2-20181030211919/@comment-2601:87:8300:20D0:218B:4159:4552:51F2-20181030231800

When I started reading that volume and even during highschool dxd hero I got a vibe Issei treated kunou like a daughter. If there was a ranking for someone  younger it would be

Daughter

Little sister

Friend

Woman

Right know I would say he sees her as either a little sister or an important friend, but not as a woman. They may change soon, but does everyone else think.