Clark’s only official duty as ‘Man of Honor’ was to keep her brother in his pants until after the reception ended. I don't think that came out quite how you meant it. :p 
"It is a remarkable dichotomy. In many ways, Clark is the most human of us all. Then...he shoots fire from the skies, and it is difficult not to think of him as a god. And how fortunate we all are that it does not occur to him." -Batman (in Superman/Batman #3 by Jeph Loeb)
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