Rias has a lot of affection towards Issei from the start of the series, which seemed to have grown as the series progressed. This is highly attributed to the Gremory's tendency to have close relations with their servants as compared to other clans. Rias doesn't seem to mind allowing Issei to gaze on her naked body. Following the events of Volume 2, Rias falls madly in love with Issei and attempts to keep him away from the other girls who may have affections for him. This includes, but is not limited to, Akeno, Asia, Xenovia, Koneko, Irina, and Ravel.