Oni no Ou to Chigire - Chapter 6 Pg 120

Tokimori muttered in a daze, still sitting on the floor. Yato grew about five centimeters in a year, therefore it should have taken him twenty-five years to reach Tokimoris height, so why was he suddenly so big? On top of that, this Yato was strong. Demon masters knew if their demons had a disposition, along with abilities, they could handle. Furthermore, they have the knowledge, and a sort of internal sense, that can determine the rank of a demons strength. They make sure that demon is manageable, or if they would be too much for them, while both parties size up each others strength. They then choose their demon accordingly. The small demon Yato was just a little above the lowest rank, which suited the powerless Tokimori just fine, but this demon undoubtedly stood at the highest rank of the demon species. He was more than unmanageable for him. This Yatos strength was too immense, and scared him enough to make his whole body tremble. Why didnt he know about this up until now? That adorable doll-like Yato was nowhere to be found.

That is your demons true form. Even my Akatsuki didnt stand a chance against him. Tokimori, how did you employ such a demon? He even went as far as to disguise himself as a small demon. I never thought you could handle a demon strong enough to fool even my eyes.