Two close friends... In that case, you can give your friend chocolate! There's two kinds of chocolate; the normal kind that you give to all your friends and the true chocolate that you only give to the one you love.

...At least, that's how it works where I'm from. I read that it's different in other countries of my world, so it might be different in other worlds too. In my country, it's also just the girls who give to the boys on Valentine's Day, but everyone is getting into the spirit here!