Romantic line to use in dog trick?

I have an adorable puppy. I want to train him so that when I hold him up and say some line, he kisses me.

I’m trying to think of a good romantic, dramatic, possibly cliché line to use. My roommates suggested something to the effect of “I never knew you felt that way,” which is too long.

We’re looking for something short so he can learn it easily. Lines from classic movies, corny pickups lines, soap opera lines, etc. are great. Any ideas?