However she still gets angry whenever he plots something behind her back without her permission or knowledge and for that she felt it necessary to punish him with nearly a thousand demonic empowered spanks. For this reason, she says that she has no problem with letting Issei see her naked and even lets him touch her breasts from time to time. To add to that, by Volume 3 Rias now usually sleeps next to him naked in his bed and joining him in the bath, showcasing her bold attempts to seduce him.

In response, Issei will do anything to protect her, as he loves her just as much as she loves him. She loves him very much and is willing to do anything with him. She often gets jealous when other girls flirt with or tempt him, even saying that Issei belongs only to her. She kissed Issei for the first time, following the latter's duel with Riser. In Volume 2, as time went on, she later started to fall in love with him and her love became deeper after he saved her from Riser and for recognizing her as an equal rather than an heir of Gremory or a Devil. After helping him save and resurrect Asia as well as killing the woman who murdered him, Issei began developing more respect and admiration for Rias to an eventual crush. Issei was attracted to her like any other girl but disliked her for forbidding him from associating with Asia for being on the Fallen Angels side and saving her from them, that is until she realised that they were up to something shady in their town. When she first summoned him, she treated him as a 'special' case, knowing that he had a lot of potential. Rias is the woman who reincarnated Issei after Raynare killed him and the woman he loves.

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