User blog comment:B214/Volume 17 spoilers./@comment-24053170-20140220004506/@comment-24468758-20140220082257

And Issei still lacks a dragon in his harem so it would be fitting. I would like to know why the tsundere thing is "pretty much confirmed" because I only read that as assumptions in this wiki.

Vali(Albion) doesn't count, Saji has his own two girls harem he doesn't know of and Ophis is only a mascot, even though he might rise a flag with Lilith, but we won't know until it happens or Ishibumi escludes it.