I cannot think of a smoother pick-up line, unless it would involve suggestions of cannibalism. It certainly deserves an answer.
” Yes. ” with nothing else said is a possibility, but it makes trouble instantly. Far better to delay the detonation until you are safely out of range. Say ” Yes ” and duly supply a number.
It need not be your number, as long as it contains some of the same digits. If you scramble them or substitute a ” 5 ” for a ” 9 ” your inquisitor will think that they misheard, and you will be safe until the next face-to-face meeting.
The wise socialite makes sure there is never a next meeting.