The Earthlings native and adopted stay in Marlatia, hiding uneventfully in the guest room, for several days. Isabella immortalizes king and queen both when they sneak her to a sufficiently large, empty, and unoccupied room to do it in. When Adarin has enough mana he makes mirror pairs for each of their majesties to contact their counterpart - Isabella's portal bag is kind of accumulating mirrors at this point. And when he has more mana still, Iobel finds a slightly-bigger-than-door-sized plank and a set of hinges and some screws and combines all these objects on the ceiling of a lockable room on the first floor but out of the way, currently serving as storage for a lot of broken musical instruments that someone once probably identified as probably repairable. This plank gets a portal on it, and the Earthlings go home.

After catching up on business - and allowing time to recover mana, again - and getting their Marlatian alts a laptop each, and putting a router and chargers within easy reach of the portal on their side, which is also on a sheet of wood but is kept in their basement propped up against a wall -

Isabella snuggles up to her husband and suggests searching the planes for more of themselves.