Comments of chapter undefined of Queens of Domination [Highschool DxD Fanfic]

Did they will use their Fallen Angel power? And did they kill Irina father to save Masaomi and Cleria? If Irina father 'death' what happened to her and her mother? Is there Romantic elements in the story? Is it normal romance? Or is it Yuri? If it is Yuri, is it just between the two sister? Or with other woman too?