I wish this would at least be done in /gpose.
Like how /gpose synchronizes the dances of a group, it should sync (and preferably put in the right range ) the two huggers.

Or they could generally do interactive emotes the way they handle double mounts. As in, you click on the player and try to use the emote and they get the option to pick yes (then both characters do the emote together) or no (nothing happens/you get a text message that the other player refused the emote).
Of course, this should come with a setting in options where you can choose between the choice window, auto-refuse (for those who do not want to be bothered) and auto-accept (for those who think it's funny and cute and do not want to bother with having to accept everytime).

I also really hope that way we can one day get a /hold emote where characters can carry other characters around :/