Leixein
it would be interesting if Nagumo Hajime managed to become engaged to the girl with an approval from Issei and the vampire Yue became his (Issei) wife, sometimes it seems that the way Issei spoils her daughters is the same as Sirzerchs spoils Rias and that it can be bad (he was even betrayed because she was so proud and spoiled). the story was very good, for a fanfic i really think it is on the same level as the famous light novel or web novel, grade 10/10 for the incredible work.