For years, Naruto was the target of Nine Tails’ undying hatred. But their time together has made Nine Tails understand Naruto more than anyone. As Naruto continues to try and free Four Tails from Madara’s control, Nine Tails begins to undergo a change.
It's because we expand in size
.لقد ازداد حجمنا عندما تحوّلنا إلى وحوش ذيول
Wenn wir in Bijū verwandelt
und so groß werden,
Como crecí al transformarme 
de jinchuuriki en un bijuu,
Como crecí al transformarme de 
jinchuuriki en un bijuu,
Quando ci trasformiamo in cercoteri
diventiamo più grandi,
Дело в нашем увеличении.