THE SECOND KALMAR UNION

According to a certain theory of the future, 

2022 Scandinavia may have expanded its culture of free love to Dornish proportions,

yet retain the monarchy under a single government, a Second Kalmar Union:

To the North, the Scandinavian countries will finally unite merging their royal families together in some form of Scandinavian marriage concept in which people are allowed to marry as many individuals as they want. The new country will be called the Second Kalmar Union and will officially have 3 kings, 3 queens and a single royal bedroom. Finland and Iceland will enter the union as dominions of Sweden and Denmark respectively. Because they aren’t monarchies, they won’t be represented in the ruling family.