Awww! How sweet is that?!?! I have no advice for you tho, sorry
Sam gives tons of kisses to Nana when he wants a bite of something OR if I have told him "no", he gives her kisses then cuts his eyes at me to see if I care.
With me, its mainly at night time when he starts in.
I was thinking there was a thread on here somewhere at some point about dogs the lick but I cant remember. Maybe someone else does.