Just make sure that both the kisser and the kissie,
are free of the common cold :-) Make this a surprise move
that will keep laughs going, in the middle and/or start
of a Kissfest.
To totally surprise your subject, try to do this when their eyes are closed.
Move towards your partner in a motion that is like your normal approach for a kiss.
Then surprise him/her by lightly brushing your nose against your partners nose.
Once again a smile is needed to pull this off in the right mood.