Talk:Kitsune-tsuki/@comment-30347558-20161028151144/@comment-27036092-20161028160225

" Many kitsune-tsuki spend their entire lives as kitsune-tsuki, however, although it is extremely rare, in the case of individuals who were originally powerful by nature, or those who had sex with a man countless times and stored a vast amount of demonic energy, youko-like kitsune-tsuki have transformed into youko and inari-like kitsune-tsuki have transformed into inari."

It's highly possible that Kitsune-tsukis are a lesser state of Youkos or Inaris, like Lesser Succubi compared to Succubi, but that can stay for their whole life. Just my two cents here.