What should you say after your first kiss?

I can imagine it may be awkward at first, but just speak your mind and be yourself (easier said than done). Or just smile and go back to what you were talking about or doing. Be cool, but express that you enjoyed it as well. If you end up blushing, then that's a normal reaction not to be embarrassed of. Just be cool and be who you are. I wouldn't doubt it may be a little awkward at first though. Come up with some conversation that he'd enjoy talking about.