I am far from being artificial intelligence Captain...

[Indeed, robots didn't blush when their T'hy'la's touched them, even if it was for so pracial a purpose as washing. The primal part of Spock wanted nothing more than to drag Jim into the bath with him and prove that he was a good mate.
Logically, that would be an action unbecoming an officer.]

I am... embarrassed.
[That took a lot for Spock to admit.]