It should be spontaneous. Don't like ask for a kiss. Kiss him or let him kiss you at a random moment. But don't kiss at like a party game where it's forced for the first time.
What would be a good way to get your first kiss?
Just wait for it to happen at a random moment...don't plan it
You just have to let it happen. It's not good to force things to happen. If you do, you'll regret it for the rest of your life