That's cute! The words "passionate kisses" and "emotional kisses" are what I like to call flexible words; there is more than one definition and everybody has their own unique definition for each.
What is your idea of passion and emotion? What comes to mind when you think of expressing yourself? Do you like a lot of physical movement, or is passion, to you, simply something like soft touching and caressing? Thinking about those types of things can help you formulate your own ideas for what you and your boyfriend can agree upon as a passionate and emotional kiss.