How to keep kissing interesting

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Try kiss feeding each other treats. It could be bits of fruit or soft candies, or just a taste of wine, a flavored, edible lube or body paint, caramel or chocolate syrup, whatever works that you both like.

Change what you do with your tongue and teeth. Nip at his lips, "count" his teeth with your tongue, see if your tongue can find anything under his tongue. Even lick his nose and laugh, then try to smother his laugh with a kiss.

Kissing doesn't always have to be serious, have fun, play with it, kiss unexpected places, put your tongue where he doesn't expect it to go, sneak flavors in your mouth to surprise him, etc...