It is almost mistletoe season, so pucker up. Kisses are powerful, especially in YA Literature. Here's a couple of sites to get your characters to lock lips.
Basically the sum of the three articles is that the initial kiss is so important because this kiss is how couples gather information about one another and that any further kissing is important because that is how the couples bond and build on their relationship.
Even if it is puppy love - kissing is important.
So have your characters slow down, breathe, and enjoy. Your readers will also enjoy the slowed pace and some of the extra details.