Well, first off, they'll be curious about where they come from. Tenebris is more on the curiosity and diplomatic side, while Sombrius is more on the high guard side and VERY protective over Tenebris (she can handle a fight easily and gets annoyed by his overprotectiveness. But it became a habit and genuine care for her after her fight with Kirby [KDL2] almost at the brink of death but saved by Morpho).

Later on, if they become more acquainted and understanding, Sombrius will be more relaxed around them with Tenebris and both of them become friendlier.