As I said I am sure Spock was thinking, "you'd make a great Aryan, Bitch" and it was a compliment on Kirk's blond hair and gorgeous profile and high cheek bones and other hot stuff. It was slash. It was slash as canon given to us by the gods.
Don't forget that they spent a lot of that episode half naked with whip marks all over them. There was also that standing on Kirk's back scene.
IT'S OBVIOUS PEOPLE