It would happens some day. It would not be something special or romantic, it will be domestic, because in this part of their life they are together in some way. They will kiss and everyone would not be suprised, because all of them will be thinking that they are together in the romanic way. More suprising for them would be news that they will tell them that they are together in romantic way, because everyone was so sure that they are together for latest few years.