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"I could've just prayed, Master." Herta pouts. "You made me take the day off just to come with you already. I don't get why we're using the instinct of some delusional specter when a vastly superior goddess is offering her powers."
You'd tried to keep this between you and Yumi, but after finding out it would require Yumi to be freed from her prison, Herta was included in these plans. And if there were any other hostile spirits, you mentally justified Herta's as invaluable.
Also, she'd overheard you and Yumi talk about going to the goblin cave and very loudly insisted on coming with.
"Hey! Who are you calling delusional?!" Yumi shouts. "I am the wailing sorrow, the condemned servant, the eternal-!"
"Both of you, that's enough." You say. Things were starting to become loud and stupid, so you sought an end to this. "Herta," You began by first addressing your first wife. "I'd take your offer any other day. But right now you're tired from using all that mana and repairing the structures, and you're just barely keeping up from taking the morning off. Right?" She reluctantly nods her head. "I don't want you to overwork yourself."
"But I can still-!"
"I know you find working for me rewarding, and it pleases me to know that even a lowly, incompetent goddess like yourself is willing to serve my every wish. But isn't there something else you should consider?" You remind her by placing a hand on her stomach. She's confused for a moment, but then her eyes widen. "Do you understand why you should take it easy now?"
"Y-yes!" She says, slightly panicked.
"Good girl." You pet her head to reassure her. You wish she'd been this understanding back at the mansion, it took you some promises of punishing her later just to make her stop whining...
"Taking care of Master's precious package inside me while being treated like an animal..." She smiles perversely. "Is the best~"
"Are you for real?" Yumi deadpans. Interestingly, her rudeness seems to merely annoy Herta.
You start to get ready and are about to leave, carrying the goddess a large chunk of the way. At least it was good exercise. You brought with you some clankers, and even an armored one to test it out against low level monsters. As expected they did pretty well.