Kisuke does, for a heartbeat, wonder if he shouldn't disclose some things -- about the Grand Fisher, about why he didn't act on that situation when he could have. But Dean and Castiel's wedding, a wedding in general, isn't the place for it. A wedding is a placee for joy. And his last slice of watermelon.

"You sound like you're happy to be here in this place; with Mr. Winchester. Does this make you Mr. Winchester as well?"