"I did not, then," he agrees just as softly.

And Kate's never told him to, but all the same. Enough hints have been dropped -- enough hope -- that in his room at Milliways, in the back of a drawer, there's a small velvet box.

(Milliways is less convenient than here, but it's also exponentially less likely to be destroyed by supervillains, alien invasion, demonic invasion, robots from the future, etc, during any given week.)