User blog comment:B214/Volume 22 spoilers/@comment-2.220.205.251-20161130231234/@comment-81.34.151.194-20161201114645

Issei's team would have 3 dragons(issei, binna, Bova) but it sounds good..

BUT, Issei has in his harem: 2 pure demons,  reincarnated demons,  2 nekomata,   fallen angel(akeno),   angel,  Valkyrie,  vampire (elmenhide)..

And in the future Le Fay(future reincarnated demon), a  nine-tailed fox(kunou) and a  Grimp Reaper(bennia)...

Put GIRLS in Occult research Club? Future victims of Issei, especially fans of Oppai Dragon... a female dragon is something new, interesting and possible.. You have made me want to know Binna more than ever, even if this never happen..