Would you kiss again the last person you kissed? (and I define "person" very broadly, I consider my furkids persons.)
Romantically? Maybe, but I would preface it by saying "This does not mean we are getting back together!" and I would only share that kiss if neither of us had moved on into another relationship yet, and the kiss did not promise more to come. I would not participate in creating an unethical faux pas, as he did so many times against me.
Familial? My grandsons, yes, I hope to get a thousand more kisses in before they grow up and don't want grandma kisses anymore.