I've got a couple of comments that might helpful. Recently, my Bride Judy had a similiar experience with her longest and closest and bestest girl friend. The lady and her husband hosted our wedding. In that case, I suspect it was simply a spontaneous sign of affection.

In my own case: My late Father and I always kissed on the lips. This may startle some, but that's they was it was. He was Europeon (Finnish) in background and it was common in his family. I've also read that the late Lyndon Johnson always greeted his Father the same way. I'm sure this is just another example of a cultural habit that is, unfortunatly, changing with the years. CHEERS, Bob