Thread:Monterossa/@comment-24098614-20170118230905/@comment-24098614-20170119170541

The ability is due to his Sacred Gear but if the person has a lousy personality and not willing to help girls when they are in trouble it doesn't do him any favors because Issei does the similar thing that Rito does in the story he is very nice towards the girls but he doesn't seduce them or tries to do with Lala does to Rito.

The reason he won them over is that he took care all of their most serious issues like for Akeno he helped her out of the serious issues she had with her father, and her hate towards her own race, and Rias he freed her from the burdens of being married to a jerk like Raiser, and given the freedom she wanted, and Koneko he helped her accept who she was especially the power of Senjutsu that she was so afraid of using, and he made her reconcile her with the sister he had.

It is no wonder that those acts were extreme acts of kindness any girl of any level would fall for someone doing this to them.