"You'd be sorry you waited." *kiss her anyway*
Or...
"Shut up." *kiss her anyway*
Or...
Get up, walk away.
Then forget about her and find some other women to kiss.
Or...
Look at your watch and say: "You're right. It's only 7:08. Everyone knows that you can't kiss anyone before 7:10." Then stand around, anxiously checking your watch, tapping your feet, looking around as if you're bored. Then, at 7:10, DON'T try to kiss her again. Look at her like she's stupid until she does something. When she asks why you aren't kissing her, tell her: "I felt like kissing you before; I don't feel like kissing you now." Then shrug and walk away because, while you were waiting for those two minutes, you spotted a hot chick you wanted to chat up.
Or...
"Why, are you a vampire or something? Can't kiss before dark? Or, I can't get you wet, like a Gremlin? You might start smokin' and shakin', shooting out little furball gremlins? Next you'll be telling me that it's too late for you to eat, huh? Maybe I want to see you smokin' and shakin'."
Or...
"Let's check and see what the kissing rulebook says about it."
Or...
"Have you ever had cold pizza for breakfast?"