This was a huge moment of trust, for Keito to be able to touch that mask.
Actually, be able to touch that mask.
If Keito would be asked, he would not be able to tell you what took over him at that moment. It was something soul-crushing, absolutely consuming and it compelled him to move forward with that action despite the warning he had received.
Since there was no rebuttal from the other, Keito felt as if he had been handed a power he should be thankful for. And he knew what that power was in this context - trust.
He was being trusted to know his limits. That felt like it was a big step for him in such a relationship. Such a show of trust was not something he was used to willingly and Keito felt himself freeze. He should not have but yet his fingers refused to move any further.
